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2,401 results on '"Hast, C"'

1. Initial performance of the Radar Echo Telescope for Cosmic Rays, RET-CR

Author

Allison, P., Beatty, J., Besson, D., Connolly, A., Cummings, A., Deaconu, C., De Kockere, S., de Vries, K. D., Frikken, D., Hast, C., Santiago, E. Huesca, Kuo, C. -Y., Kyriacou, A., Latif, U. A., Loonen, J., Loudon, I., Lukic, V., McLennan, C., Mulrey, K., Nam, J., Nivedita, K., Nozdrina, A., Oberla, E., Prohira, S., Ralston, J. P., Seikh, M. F. H., Stanley, R. S., Toscano, S., Broeck, D. Van den, van Eijndhoven, N., and Wissel, S.

Subjects
High Energy Physics - Experiment, Astrophysics - High Energy Astrophysical Phenomena
Abstract

The Radar Echo Telescope for Cosmic Rays (RET-CR), a pathfinder instrument for the radar echo method of ultrahigh energy (UHE) neutrino detection, was initially deployed near Summit Station, Greenland, in May 2023. After a 4 week commissioning period, 9 days of data were taken before the instrument went offline. In this article, we describe the instrument as it was deployed, and the initial performance of the detector. We show that the technical aspects of running a radar based particle cascade detector in the ice have been demonstrated. Analysis of the 2023 data informed improvements that were incorporated into the May-August 2024 deployment, which has just concluded at time of writing. Results from the 2024 run will be presented in forthcoming publications., Comment: To be submitted to PRD

Published
2024

2. Macroscopic approach to the radar echo scatter from high-energy particle cascades

Author

Santiago, E. Huesca, de Vries, K. D., Allison, P., Beatty, J., Besson, D., Connolly, A., Cummings, A., Deaconu, C., De Kockere, S., Frikken, D., Hast, C., Kuo, C. -Y., Kyriacou, A., Latif, U. A., Loudon, I., Lukic, V., McLennan, C., Mulrey, K., Nam, J., Nivedita, K., Nozdrina, A., Oberla, E., Prohira, S., Ralston, J. P., Seikh, M. F. H., Stanley, R. S., Stoffels, J., Toscano, S., Broeck, D. Van den, van Eijndhoven, N., and Wissel, S.

Subjects
Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

To probe the cosmic particle flux at the highest energies, large volumes of dense material like ice have to be monitored. This can be achieved by exploiting the radio signal. In this work, we provide a macroscopic model to predict the radar echo signatures found when a radio signal is reflected from a cosmic-ray or neutrino-induced particle cascade propagating in a dense medium like ice. Its macroscopic nature allows for an energy independent run-time, taking less than 10 s for simulating a single scatter event. As a first application, we discuss basic signal properties and simulate the expected signal for the T-576 beam-test experiment at the Stanford Linear Accelerator Center. We find good signal strength agreement with the only observed radar echo from a high-energy particle cascade to date., Comment: 12 pages, 8 figures

Published
2023
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3. Wakefield Generation in Hydrogen and Lithium Plasmas at FACET-II: Diagnostics and First Beam-Plasma Interaction Results

Author

Storey, D., Zhang, C., Claveria, P. San Miguel, Cao, G. J., Adli, E., Alsberg, L., Ariniello, R., Clarke, C., Corde, S., Dalichaouch, T. N., Ekerfelt, H., Emma, C., Gerstmayr, E., Gessner, S., Gilljohann, M., Hast, C., Knetsch, A., Lee, V., Litos, M., Loney, R., Marsh, K. A., Matheron, A., Mori, W. B., Nie, Z., O'Shea, B., Parker, M., White, G., Yocky, G., Zakharova, V., Hogan, M. J., and Joshi, C.

Subjects
Physics - Accelerator Physics
Abstract

Plasma Wakefield Acceleration (PWFA) provides ultrahigh acceleration gradients of 10s of GeV/m, providing a novel path towards efficient, compact, TeV-scale linear colliders and high brightness free electron lasers. Critical to the success of these applications is demonstrating simultaneously high gradient acceleration, high energy transfer efficiency, and preservation of emittance, charge, and energy spread. Experiments at the FACET-II National User Facility at SLAC National Accelerator Laboratory aim to achieve all of these milestones in a single stage plasma wakefield accelerator, providing a 10 GeV energy gain in a <1 m plasma with high energy transfer efficiency. Such a demonstration depends critically on diagnostics able to measure emittance with mm-mrad accuracy, energy spectra to determine both %-level energy spread and broadband energy gain and loss, incoming longitudinal phase space, and matching dynamics. This paper discusses the experimental setup at FACET-II, including the incoming beam parameters from the FACET-II linac, plasma sources, and diagnostics developed to meet this challenge. Initial progress on the generation of beam ionized wakes in meter-scale hydrogen gas is discussed, as well as commissioning of the plasma sources and diagnostics.

Published
2023

4. Search for $B$ Mesogenesis at BABAR

Author

BABAR Collaboration, Lees, J. P., Poireau, V., Tisserand, V., Grauges, E., Palano, A., Eigen, G., Brown, D. N., Kolomensky, Yu. G., Fritsch, M., Koch, H., Cheaib, R., Hearty, C., Mattison, T. S., McKenna, J. A., So, R. Y., Blinov, V. E., Buzykaev, A. R., Druzhinin, V. P., Golubev, V. B., Kozyrev, E. A., Kravchenko, E. A., Onuchin, A. P., Serednyakov, S. I., Skovpen, Yu. I., Solodov, E. P., Todyshev, K. Yu., Lankford, A. J., Dey, B., Gary, J. W., Long, O., Eisner, A. M., Lockman, W. S., Vazquez, W. Panduro, Chao, D. S., Cheng, C. H., Echenard, B., Flood, K. T., Hitlin, D. G., Kim, J., Li, Y., Lin, D. X., Middleton, S., Miyashita, T. S., Ongmongkolkul, P., Oyang, J., Porter, F. C., Röhrken, M., Huard, Z., Meadows, B. T., Pushpawela, B. G., Sokoloff, M. D., Sun, L., Smith, J. G., Wagner, S. R., Bernard, D., Verderi, M., Bettoni, D., Bozzi, C., Calabrese, R., Cibinetto, G., Fioravanti, E., Garzia, I., Luppi, E., Santoro, V., Calcaterra, A., de Sangro, R., Finocchiaro, G., Martellotti, S., Patteri, P., Peruzzi, I. M., Piccolo, M., Rotondo, M., Zallo, A., Passaggio, S., Patrignani, C., Shuve, B. J., Lacker, H. M., Bhuyan, B., Mallik, U., Chen, C., Cochran, J., Prell, S., Gritsan, A. V., Arnaud, N., Davier, M., Diberder, F. Le, Lutz, A. M., Wormser, G., Lange, D. J., Wright, D. M., Coleman, J. P., Gabathuler, E., Hutchcroft, D. E., Payne, D. J., Touramanis, C., Bevan, A. J., Di Lodovico, F., Sacco, R., Cowan, G., Banerjee, Sw., Davis, C. L., Denig, A. G., Gradl, W., Griessinger, K., Hafner, A., Schubert, K. R., Barlow, R. J., Lafferty, G. D., Cenci, R., Jawahery, A., Roberts, D. A., Cowan, R., Robertson, S. H., Seddon, R. M., Neri, N., Palombo, F., Cremaldi, L., Godang, R., Summers, D. J., Taras, P., De Nardo, G., Sciacca, C., Raven, G., Jessop, C. P., LoSecco, J. M., Honscheid, K., Kass, R., Gaz, A., Margoni, M., Posocco, M., Simi, G., Simonetto, F., Stroili, R., Akar, S., Ben-Haim, E., Bomben, M., Bonneaud, G. R., Calderini, G., Chauveau, J., Marchiori, G., Ocariz, J., Biasini, M., Manoni, E., Rossi, A., Batignani, G., Bettarini, S., Carpinelli, M., Casarosa, G., Chrzaszcz, M., Forti, F., Giorgi, M. A., Lusiani, A., Oberhof, B., Paoloni, E., Rama, M., Rizzo, G., Walsh, J. J., Zani, L., Smith, A. J. S., Anulli, F., Faccini, R., Ferrarotto, F., Ferroni, F., Pilloni, A., Piredda, G., Bünger, C., Dittrich, S., Grünberg, O., Heß, M., Leddig, T., Voß, C., Waldi, R., Adye, T., Wilson, F. F., Emery, S., Vasseur, G., Aston, D., Cartaro, C., Convery, M. R., Dorfan, J., Dunwoodie, W., Ebert, M., Field, R. C., Fulsom, B. G., Graham, M. T., Hast, C., Innes, W. R., Kim, P., Leith, D. W. G. S., Luitz, S., MacFarlane, D. B., Muller, D. R., Neal, H., Ratcliff, B. N., Roodman, A., Sullivan, M. K., Va'vra, J., Wisniewski, W. J., Purohit, M. V., Wilson, J. R., Randle-Conde, A., Sekula, S. J., Ahmed, H., Tasneem, N., Bellis, M., Burchat, P. R., Puccio, E. M. T., Alam, M. S., Ernst, J. A., Gorodeisky, R., Guttman, N., Peimer, D. R., Soffer, A., Spanier, S. M., Ritchie, J. L., Schwitters, R. F., Izen, J. M., Lou, X. C., Bianchi, F., De Mori, F., Filippi, A., Gamba, D., Lanceri, L., Vitale, L., Martinez-Vidal, F., Oyanguren, A., Albert, J., Beaulieu, A., Bernlochner, F. U., King, G. J., Kowalewski, R., Lueck, T., Miller, C., Nugent, I. M., Roney, J. M., Sobie, R. J., Gershon, T. J., Harrison, P. F., Latham, T. E., Prepost, R., and Wu, S. L.

Subjects
High Energy Physics - Experiment
Abstract

A new mechanism has been proposed to simultaneously explain the presence of dark matter and the matter-antimatter asymmetry in the universe. This scenario predicts exotic $B$ meson decays into a baryon and a dark sector anti-baryon ($\psi_D$) with branching fractions accessible at $B$ factories. We present a search for $B \rightarrow \Lambda \psi_D$ decays using data collected by the $BABAR$ experiment at SLAC. This reaction is identified by fully reconstructing the accompanying $B$ meson and requiring the presence of a single $\Lambda$ baryon in the remaining particles. No significant signal is observed, and bounds on the $B \rightarrow \Lambda \psi_D$ branching fraction are derived in the range $0.13 - 5.2\times 10^{-5}$ for $1.0 < m_{\psi_D} < 4.2$ GeV/$c^{2}$. These results set strong constraints on the parameter space allowed by the theory.

Published
2023
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5. Analysis of a Tau Neutrino Origin for the Near-Horizon Air Shower Events Observed by the Fourth Flight of the Antarctic Impulsive Transient Antenna (ANITA)

Author

Prechelt, R., Wissel, S. A., Romero-Wolf, A., Burch, C., Gorham, P. W., Allison, P., Alvarez-Muñiz, J., Banerjee, O., Batten, L., Beatty, J. J., Belov, K., Besson, D. Z., Binns, W. R., Bugaev, V., Cao, P., Carvalho Jr., W., Chen, C. H., Chen, P., Chen, Y., Clem, J. M., Connolly, A., Cremonesi, L., Dailey, B., Deaconu, C., Dowkontt, P. F., Fox, B. D., Gordon, J. W. H., Hast, C., Hill, B., Hsu, S. Y., Huang, J. J., Hughes, K., Hupe, R., Israel, M. H., Liewer, K. M., Liu, T. C., Ludwig, A. B., Macchiarulo, L., Matsuno, S., McBride, K., Miki, C., Mulrey, K., Nam, J., Naudet, C., Nichol, R. J., Novikov, A., Oberla, E., Prohira, S., Rauch, B. F., Ripa, J., Roberts, J. M., Rotter, B., Russell, J. W., Saltzberg, D., Seckel, D., Schoorlemmer, H., Shiao, J., Stafford, S., Stockham, J., Stockham, M., Strutt, B., Sutherland, M. S., Varner, G. S., Vieregg, A. G., Wang, N., Wang, S. H., Zas, E., and Zeolla, A.

Subjects
Astrophysics - High Energy Astrophysical Phenomena, High Energy Physics - Experiment
Abstract

We study in detail the sensitivity of the Antarctic Impulsive Transient Antenna (ANITA) to possible $\nu_\tau$ point source fluxes detected via $\tau$-lepton-induced air showers. This investigation is framed around the observation of four upward-going extensive air shower events very close to the horizon seen in ANITA-IV. We find that these four upgoing events are not observationally inconsistent with $\tau$-induced EASs from Earth-skimming $\nu_\tau$, both in their spectral properties as well as in their observed locations on the sky. These four events, as well as the overall diffuse and point source exposure to Earth-skimming $\nu_\tau$, are also compared against published ultrahigh-energy neutrino limits from the Pierre Auger Observatory. While none of these four events occurred at sky locations simultaneously visible by Auger, the implied fluence necessary for ANITA to observe these events is in strong tension with limits set by Auger across a wide range of energies and is additionally in tension with ANITA's Askaryan in-ice neutrino channel above $10^{19}$ eV. We conclude by discussing some of the technical challenges with simulating and analyzing these near horizon events and the potential for future observatories to observe similar events., Comment: 19 pages, 22 figures, will be published in Physical Review D (PRD)

Published
2021
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6. Picosecond Timing-Planes for Future Collider Detectors

Author

Gorham, P. W., Campos, C., Hast, C., Jobe, K., Miki, C., Nguyen, L., Olmedo, M., Prechelt, R., Sonoda, C., and Varner, G. S.

Subjects
Physics - Instrumentation and Detectors, High Energy Physics - Experiment
Abstract

We report experimental test-beam results on dielectric-loaded waveguide detectors that utilize microwave Cherenkov signals to time and characterize high energy particle showers. These results are used to validate models and produce high-fidelity simulations of timing plane systems which yield picosecond time tags and millimeter spatial coordinates for the shower centroid. These timing planes, based on the Askaryan effect in solid dielectrics, are most effective at the high center-of-momentum energies planned for the Future Circular Collider (FCC-hh), and are of particular interest in the forward region due to their high radiation immunity. We use our beam test results and GEANT4 simulations to validate a hybrid microwave detector model, which is used to simulate a reference timing plane design for the FCC forward calorimeters. Our results indicate that 0.5-3 ps particle timing is possible for a wide range of collision products in the reference FCC hadron collider detector, even with current technology., Comment: 34 pages, 35 figures

Published
2021
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7. The SLAC T-510 experiment for radio emission from particle showers: detailed simulation study and interpretation

Author

Bechtol, K., Belov, K., Borch, K., Chen, P., Clem, J., Gorham, P., Hast, C., Huege, T., Hyneman, R., Jobe, K., Kuwatani, K., Lam, J., Liu, T. C., Mulrey, K., Nam, J., Naudet, C., Nichol, R. J., Paciaroni, C., Rauch, B. F., Romero-Wolf, A., Rotter, B., Saltzberg, D., Schoorlemmer, H., Seckel, D., Strutt, B., Vieregg, A., Williams, C., Wissel, S., and Zilles, A.

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics, Astrophysics - High Energy Astrophysical Phenomena
Abstract

Over the last several decades, radio detection of air showers has been widely used to detect ultra-high-energy cosmic rays. We developed an experiment under controlled laboratory conditions at SLAC with which we measured the radio-frequency radiation from a charged particle shower produced by bunches of electrons as primaries with known energy. The shower took place in a target made of High Density Polyethylene located in a strong magnetic field. The experiment was designed so that Askaryan and magnetically-induced components of the radio emission could be measured independently. At the same time, we performed a detailed simulation of this experiment to predict the radio signal using two microscopic formalisms, endpoint and ZHS. In this paper, we present the simulation scheme and make a comparison with data characteristics such as linearity with magnetic field and amplitude. The simulations agree with the measurements within uncertainties and present a good description of the data. In particular, reflections within the target that accounted for the largest systematic uncertainties are addressed. The prediction of the amplitude of Askaryan emission agrees with measurements to within 5% for the endpoint formalism and 11% for the ZHS formalism. The amplitudes of magnetically-induced emission agree to within 5% for the endpoint formalism and less than 1% for the ZHS formalism. The agreement of the absolute scale of emission gives confidence in state-of-the-art air shower simulations which are based on the applied formalisms.

Published
2021
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8. The Radar Echo Telescope for Cosmic Rays: Pathfinder Experiment for a Next-Generation Neutrino Observatory

Author

Prohira, S., de Vries, K. D., Allison, P., Beatty, J., Besson, D., Connolly, A., Dasgupta, P., Deaconu, C., De Kockere, S., Frikken, D., Hast, C., Santiago, E. Huesca, Kuo, C. -Y., Latif, U. A., Lukic, V., Meures, T., Mulrey, K., Nam, J., Nozdrina, A., Oberla, E., Ralston, J. P., Sbrocco, C., Stanley, R. S., Torres, J., Toscano, S., Broeck, D. Van den, van Eijndhoven, N., and Wissel, S.

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics, Astrophysics - High Energy Astrophysical Phenomena, High Energy Physics - Experiment
Abstract

The Radar Echo Telescope for Cosmic Rays (RET-CR) is a recently initiated experiment designed to detect the englacial cascade of a cosmic-ray initiated air shower via in-ice radar, toward the goal of a full-scale, next-generation experiment to detect ultra high energy neutrinos in polar ice. For cosmic rays with a primary energy greater than 10 PeV, roughly 10% of an air-shower's energy reaches the surface of a high elevation ice-sheet ($\gtrsim$2 km) concentrated into a radius of roughly 10 cm. This penetrating shower core creates an in-ice cascade many orders of magnitude more dense than the preceding in-air cascade. This dense cascade can be detected via the radar echo technique, where transmitted radio is reflected from the ionization deposit left in the wake of the cascade. RET-CR will test the radar echo method in nature, with the in-ice cascade of a cosmic-ray initiated air-shower serving as a test beam. We present the projected event rate and sensitivity based upon a three part simulation using CORSIKA, GEANT4, and RadioScatter. RET-CR expects $\sim$1 radar echo event per day.

Published
2021
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9. Modeling in-ice radio propagation with parabolic equation methods

Author

Prohira, S., Sbrocco, C., Allison, P., Beatty, J., Besson, D., Connolly, A., Dasgupta, P., Deaconu, C., de Vries, K. D., De Kockere, S., Frikken, D., Hast, C., Santiago, E. Huesca, Kuo, C. -Y., Latif, U. A., Lukic, V., Meures, T., Mulrey, K., Nam, J., Nozdrina, A., Ralston, J. P., Stanley, R. S., Torres, J., Toscano, S., Broeck, D. Van den, van Eijndhoven, N., and Wissel, S.

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics, Physics - Computational Physics
Abstract

We investigate the use of parabolic equation (PE) methods for solving radio-wave propagation in polar ice. PE methods provide an approximate solution to Maxwell's equations, in contrast to full-field solutions such as finite-difference-time-domain (FDTD) methods, yet provide a more complete model of propagation than simple geometric ray-tracing (RT) methods that are the current state of the art for simulating in-ice radio detection of neutrino-induced cascades. PE are more computationally efficient than FDTD methods, and more flexible than RT methods, allowing for the inclusion of diffractive effects, and modeling of propagation in regions that cannot be modeled with geometric methods. We present a new PE approximation suited to the in-ice case. We conclude that current ray-tracing methods may be too simplistic in their treatment of ice properties, and their continued use could overestimate experimental sensitivity for in-ice neutrino detection experiments. We discuss the implications for current in-ice Askaryan-type detectors and for the upcoming Radar Echo Telescope; two families of experiments for which these results are most relevant. We suggest that PE methods be investigated further for in-ice radio applications.

Published
2020
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10. The Payload for Ultrahigh Energy Observations (PUEO): A White Paper

Author

Abarr, Q., Allison, P., Yebra, J. Ammerman, Alvarez-Muñiz, J., Beatty, J. J., Besson, D. Z., Chen, P., Chen, Y., Clem, J. M., Connolly, A., Cremonesi, L., Deaconu, C., Flaherty, J., Frikken, D., Gorham, P. W., Hast, C., Hornhuber, C., Huang, J. J., Hughes, K., Hynous, A., Ku, Y., Kuo, C. -Y., Liu, T. C., Martin, Z., Miki, C., Nam, J., Nichol, R. J., Nishimura, K., Novikov, A., Nozdrina, A., Oberla, E., Prohira, S., Prechelt, R., Rauch, B. F., Roberts, J. M., Romero-Wolf, A., Russell, J. W., Seckel, D., Shiao, J., Smith, D., Southall, D., Varner, G. S., Vieregg, A. G., Wang, S. -H., Wang, Y. -H., Wissel, S. A., Xie, C., Young, R., Zas, E., and Zeolla, A.

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics, Astrophysics - High Energy Astrophysical Phenomena, High Energy Physics - Experiment, Physics - Instrumentation and Detectors
Abstract

The Payload for Ultrahigh Energy Observations (PUEO) long-duration balloon experiment is designed to have world-leading sensitivity to ultrahigh-energy neutrinos at energies above 1 EeV. Probing this energy region is essential for understanding the extreme-energy universe at all distance scales. PUEO leverages experience from and supersedes the successful Antarctic Impulsive Transient Antenna (ANITA) program, with an improved design that drastically improves sensitivity by more than an order of magnitude at energies below 30 EeV. PUEO will either make the first significant detection of or set the best limits on ultrahigh-energy neutrino fluxes., Comment: 40 pages, 17 figures. Version accepted to JINST

Published
2020
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11. A search for ultrahigh-energy neutrinos associated with astrophysical sources using the third flight of ANITA

Author

Deaconu, C., Batten, L., Allison, P., Banerjee, O., Beatty, J. J., Belov, K., Besson, D. Z., Binns, W. R., Bugaev, V., Cao, P., Chen, C. H., Chen, P., Chen, Y., Clem, J. M., Connolly, A., Cremonesi, L., Dailey, B., Dowkontt, P. F., Fox, B. D., Gordon, J. W. H., Gorham, P. W., Hast, C., Hill, B., Hsu, S. Y., Huang, J. J., Hughes, K., Hupe, R., Israel, M. H., Liewer, K. M., Liu, T. C., Ludwig, A. B., Macchiarulo, L., Matsuno, S., McBride, K., Miki, C., Mulrey, K., Nam, J., Naudet, C., Nichol, R. J., Novikov, A., Oberla, E., Prohira, S., Prechelt, R., Rauch, B. F., Ripa, J., Roberts, J. M., Romero-Wolf, A., Rotter, B., Russell, J. W., Saltzberg, D., Seckel, D., Schoorlemmer, H., Shiao, J., Stafford, S., Stockham, J., Stockham, M., Strutt, B., Sutherland, M. S., Varner, G. S., Vieregg, A. G., Wang, N., Wang, S. H., and Wissel, S. A.

Subjects
Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Instrumentation and Methods for Astrophysics, High Energy Physics - Experiment
Abstract

The ANtarctic Impulsive Transient Antenna (ANITA) long-duration balloon experiment is sensitive to interactions of ultra high-energy (E > 10^{18} eV) neutrinos in the Antarctic ice sheet. The third flight of ANITA, lasting 22 days, began in December 2014. We develop a methodology to search for energetic neutrinos spatially and temporally coincident with potential source classes in ANITA data. This methodology is applied to several source classes: the TXS 0506+056 blazar and NGC 1068, the first potential TeV neutrino sources identified by IceCube, flaring high-energy blazars reported by the Fermi All-Sky Variability Analysis, gamma-ray bursts, and supernovae. Among searches within the five source classes, one candidate was identified as associated with SN 2015D, although not at a statistically significant level. We proceed to place upper limits on the source classes. We further comment on potential applications of this methodology to more sensitive future instruments., Comment: 23 pages, 7 figures, version accepted to JCAP

Published
2020
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12. Unusual Near-horizon Cosmic-ray-like Events Observed by ANITA-IV

Author

ANITA Collaboration, Gorham, P. W., Ludwig, A., Deaconu, C., Cao, P., Allison, P., Banerjee, O., Batten, L., Bhattacharya, D., Beatty, J. J., Belov, K., Binns, W. R., Bugaev, V., Chen, C. H., Chen, P., Chen, Y., Clem, J. M., Cremonesi, L., Dailey, B., Dowkontt, P. F., Fox, B. D., Gordon, J. W. H., Hast, C., Hill, B., Hsu, S. Y., Huang, J. J., Hughes, K., Hupe, R., Israel, M. H., Liu, T. C., Macchiarulo, L., Matsuno, S., McBride, K., Miki, C., Nam, J., Naudet, C. J., Nichol, R. J., Novikov, A., Oberla, E., Olmedo, M., Prechelt, R., Prohira, S., Rauch, B. F., Roberts, J. M., Romero-Wolf, A., Rotter, B., Russell, J. W., Saltzberg, D., Seckel, D., Schoorlemmer, H., Shiao, J., Stafford, S., Stockham, J., Stockham, M., Strutt, B., Sutherland, M. S., Varner, G. S., Vieregg, A. G., Wang, S. H., and Wissel, S. A.

Subjects
Astrophysics - High Energy Astrophysical Phenomena
Abstract

ANITA's fourth long-duration balloon flight in late 2016 detected 29 cosmic-ray (CR)-like events on a background of $0.37^{+0.27}_{-0.17}$ anthropogenic events. CRs are mainly seen in reflection off the Antarctic ice sheets, creating a characteristic phase-inverted waveform polarity. However, four of the below-horizon CR-like events show anomalous non-inverted polarity, a $p = 5.3 \times 10^{-4}$ chance if due to background. All anomalous events are from locations near the horizon; ANITA-IV observed no steeply-upcoming anomalous events similar to the two such events seen in prior flights., Comment: 6 pages, 4 figures, to appear in Physical Review Letters. Supplemental material (reference 17) available from corresponding author

Published
2020
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13. Precision measurement of the ${\cal B}(\Upsilon(3S)\to\tau^+\tau^-)/{\cal B}(\Upsilon(3S)\to\mu^+\mu^-)$ ratio

Author

Lees, J. P., Poireau, V., Tisserand, V., Grauges, E., Palano, A., Eigen, G., Brown, D. N., Kolomensky, Yu. G., Fritsch, M., Koch, H., Schroeder, T., Cheaib, R., Hearty, C., Mattison, T. S., McKenna, J. A., So, R. Y., Blinov, V. E., Buzykaev, A. R., Druzhinin, V. P., Golubev, V. B., Kozyrev, E. A., Kravchenko, E. A., Onuchin, A. P., Serednyakov, S. I., Skovpen, Yu. I., Solodov, E. P., Todyshev, K. Yu., Lankford, A. J., Dey, B., Gary, J. W., Long, O., Eisner, A. M., Lockman, W. S., Vazquez, W. Panduro, Chao, D. S., Cheng, C. H., Echenard, B., Flood, K. T., Hitlin, D. G., Kim, J., Li, Y., Lin, D. X., Miyashita, T. S., Ongmongkolkul, P., Oyang, J., Porter, F. C., Röhrken, M., Huard, Z., Meadows, B. T., Pushpawela, B. G., Sokoloff, M. D., Sun, L., Smith, J. G., Wagner, S. R., Bernard, D., Verderi, M., Bettoni, D., Bozzi, C., Calabrese, R., Cibinetto, G., Fioravanti, E., Garzia, I., Luppi, E., Santoro, V., Calcaterra, A., de Sangro, R., Finocchiaro, G., Martellotti, S., Patteri, P., Peruzzi, I. M., Piccolo, M., Rotondo, M., Zallo, A., Passaggio, S., Patrignani, C., Shuve, B. J., Lacker, H. M., Bhuyan, B., Mallik, U., Chen, C., Cochran, J., Prell, S., Gritsan, A. V., Arnaud, N., Davier, M., Diberder, F. Le, Lutz, A. M., Wormser, G., Lange, D. J., Wright, D. M., Coleman, J. P., Gabathuler, E., Hutchcroft, D. E., Payne, D. J., Touramanis, C., Bevan, A. J., Di Lodovico, F., Sacco, R., Cowan, G., Banerjee, Sw., Davis, C. L., Denig, A. G., Gradl, W., Griessinger, K., Hafner, A., Schubert, K. R., Barlow, R. J., Lafferty, G. D., Cenci, R., Jawahery, A., Roberts, D. A., Cowan, R., Robertson, S. H., Seddon, R. M., Neri, N., Palombo, F., Cremaldi, L., Godang, R., Summers, D. J., Taras, P., De Nardo, G., Sciacca, C., Raven, G., Jessop, C. P., LoSecco, J. M., Honscheid, K., Kass, R., Gaz, A., Margoni, M., Posocco, M., Simi, G., Simonetto, F., Stroili, R., Akar, S., Ben-Haim, E., Bomben, M., Bonneaud, G. R., Calderini, G., Chauveau, J., Marchiori, G., Ocariz, J., Biasini, M., Manoni, E., Rossi, A., Batignani, G., Bettarini, S., Carpinelli, M., Casarosa, G., Chrzaszcz, M., Forti, F., Giorgi, M. A., Lusiani, A., Oberhof, B., Paoloni, E., Rama, M., Rizzo, G., Walsh, J. J., Zani, L., Smith, A. J. S., Anulli, F., Faccini, R., Ferrarotto, F., Ferroni, F., Pilloni, A., Piredda, G., Bünger, C., Dittrich, S., Grünberg, O., Heß, M., Leddig, T., Voß, C., Waldi, R., Adye, T., Wilson, F. F., Emery, S., Vasseur, G., Aston, D., Cartaro, C., Convery, M. R., Dorfan, J., Dunwoodie, W., Ebert, M., Field, R. C., Fulsom, B. G., Graham, M. T., Hast, C., Innes, W. R., Kim, P., Leith, D. W. G. S., Luitz, S., MacFarlane, D. B., Muller, D. R., Neal, H., Ratcliff, B. N., Roodman, A., Sullivan, M. K., Va'vra, J., Wisniewski, W. J., Purohit, M. V., Wilson, J. R., Randle-Conde, A., Sekula, S. J., Ahmed, H., Bellis, M., Burchat, P. R., Puccio, E. M. T., Alam, M. S., Ernst, J. A., Gorodeisky, R., Guttman, N., Peimer, D. R., Soffer, A., Spanier, S. M., Ritchie, J. L., Schwitters, R. F., Izen, J. M., Lou, X. C., Bianchi, F., De Mori, F., Filippi, A., Gamba, D., Lanceri, L., Vitale, L., Martinez-Vidal, F., Oyanguren, A., Albert, J., Beaulieu, A., Bernlochner, F. U., King, G. J., Kowalewski, R., Lueck, T., Nugent, I. M., Roney, J. M., Sibidanov, A., Sobie, R. J., Tasneem, N., Gershon, T. J., Harrison, P. F., Latham, T. E., Prepost, R., and Wu, S. L.

Subjects
High Energy Physics - Experiment
Abstract

We report on a precision measurement of the ratio ${\cal R}_{\tau\mu}^{\Upsilon(3S)} = {\cal B}(\Upsilon(3S)\to\tau^+\tau^-)/{\cal B}(\Upsilon(3S)\to\mu^+\mu^-)$ using data collected with the BaBar detector at the SLAC PEP-II $e^+e^-$ collider. The measurement is based on a 28 fb$^{-1}$ data sample collected at a center-of-mass energy of 10.355 GeV corresponding to a sample of 122 million $\Upsilon(3S)$ mesons. The ratio is measured to be ${\cal R}_{\tau\mu}^{\Upsilon(3S)} = 0.966 \pm 0.008_\mathrm{stat} \pm 0.014_\mathrm{syst}$ and is in agreement with the Standard Model prediction of 0.9948 within 2 standard deviations. The uncertainty in ${\cal R}_{\tau\mu}^{\Upsilon(3S)}$ is almost an order of magnitude smaller than the only previous measurement., Comment: 8 pages, 4 figures, 3 tables

Published
2020
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14. Search for lepton-flavor violating decays $D^{0}\rightarrow X^{0}e^{\pm}\mu^{\mp}$

Author

BaBar Collaboration, Lees, J. P., Poireau, V., Tisserand, V., Grauges, E., Palano, A., Eigen, G., Brown, D. N., Kolomensky, Yu. G., Fritsch, M., Koch, H., Schroeder, T., Cheaib, R., Hearty, C., Mattison, T. S., McKenna, J. A., So, R. Y., Blinov, V. E., Buzykaev, A. R., Druzhinin, V. P., Golubev, V. B., Kozyrev, E. A., Kravchenko, E. A., Onuchin, A. P., Serednyakov, S. I., Skovpen, Yu. I., Solodov, E. P., Todyshev, K. Yu., Lankford, A. J., Dey, B., Gary, J. W., Long, O., Eisner, A. M., Lockman, W. S., Panduro, W., Chao, D. S., Cheng, C. H., Echenard, B., Flood, K. T., Hitlin, D. G., Kim, J., Li, Y., Lin, D. X., Miyashita, T. S., Ongmongkolkul, P., Oyang, J., Porter, F. C., R, M., Huard, Z., Meadows, B. T., Pushpawela, B. G., Sokoloff, M. D., Sun, L., Smith, J. G., Wagner, S. R., Bernard, D., Verderi, M., Bettoni, D., Bozzi, C., Calabrese, R., Cibinetto, G., Fioravanti, E., Garzia, I., Luppi, E., Santoro, V., Calcaterra, A., de Sangro, R., Finocchiaro, G., Martellotti, S., Patteri, P., Peruzzi, I. M., Piccolo, M., Rotondo, M., Zallo, A., Passaggio, S., Patrignani, C., Shuve, B. J., Lacker, H. M., Bhuyan, B., Mallik, U., Chen, C., Cochran, J., Prell, S., Gritsan, A. V., Arnaud, N., Davier, M., Diberder, F. Le, Lutz, A. M., Wormser, G., Lange, D. J., Wright, D. M., Coleman, J. P., Gabathuler, E., Hutchcroft, D. E., Payne, D. J., Touramanis, C., Bevan, A. J., Di Lodovico, F., Sacco, R., Cowan, G., Banerjee, Sw., Davis, C. L., Denig, A. G., Gradl, W., Griessinger, K., Hafner, A., Schubert, K. R., Barlow, R. J., Lafferty, G. D., Cenci, R., Jawahery, A., Roberts, D. A., Cowan, R., Robertson, S. H., Seddon, R. M., Neri, N., Palombo, F., Cremaldi, L., Godang, R., Summers, D. J., Taras, P., De, G., Sciacca, C., Raven, G., Jessop, C. P., LoSecco, J. M., Honscheid, K., Kass, R., Gaz, A., Margoni, M., Posocco, M., Simi, G., Simonetto, F., Stroili, R., Akar, S., Ben, E., Bomben, M., Bonneaud, G. R., Calderini, G., Chauveau, J., Marchiori, G., Ocariz, J., Biasini, M., Manoni, E., Rossi, A., Batignani, G., Bettarini, S., Carpinelli, M., Casarosa, G., Chrzaszcz, M., Forti, F., Giorgi, M. A., Lusiani, A., Oberhof, B., Paoloni, E., Rama, M., Rizzo, G., Walsh, J. J., Zani, L., Smith, A. J. S., Anulli, F., Faccini, R., Ferrarotto, F., Ferroni, F., Pilloni, A., Piredda, G., B, C., Dittrich, S., Gr, O., He, M., Leddig, T., Vo, C., Waldi, R., Adye, T., Wilson, F. F., Emery, S., Vasseur, G., Aston, D., Cartaro, C., Convery, M. R., Dorfan, J., Dunwoodie, W., Ebert, M., Field, R. C., Fulsom, B. G., Graham, M. T., Hast, C., Innes, W. R., Kim, P., Leith, D. W. G. S., Luitz, S., MacFarlane, D. B., Muller, D. R., Neal, H., Ratcliff, B. N., Roodman, A., Sullivan, M. K., Va, J., Wisniewski, W. J., Purohit, M. V., Wilson, J. R., Randle, A., Sekula, S. J., Ahmed, H., Bellis, M., Burchat, P. R., Puccio, E. M. T., Alam, M. S., Ernst, J. A., Gorodeisky, R., Guttman, N., Peimer, D. R., Soffer, A., Spanier, S. M., Ritchie, J. L., Schwitters, R. F., Izen, J. M., Lou, X. C., Bianchi, F., De, F., Filippi, A., Gamba, D., Lanceri, L., Vitale, L., Martinez, F., Oyanguren, A., Albert, J., Beaulieu, A., Bernlochner, F. U., King, G. J., Kowalewski, R., Lueck, T., Nugent, I. M., Roney, J. M., Sobie, R. J., Tasneem, N., Gershon, T. J., Harrison, P. F., Latham, T. E., Prepost, R., and Wu, S. L.

Subjects
High Energy Physics - Experiment
Abstract

We present a search for seven lepton-flavor-violating neutral charm decays of the type $D^{0}\rightarrow X^{0} e^{\pm} \mu^{\mp}$, where $X^{0}$ represents a $\pi^{0}$, $K^{0}_{\rm S}$, $\bar{K^{*0}}$, $\rho^{0}$, $\phi$, $\omega$, or $\eta$ meson. The analysis is based on $468$ fb$^{-1}$ of $e^+e^-$ annihilation data collected at or close to the $\Upsilon(4S)$ resonance with the BaBar detector at the SLAC National Accelerator Laboratory. No significant signals are observed, and we establish 90\% confidence level upper limits on the branching fractions in the range $(5.0 - 22.5)\times 10^{-7}$. The limits are between one and two orders of magnitude more stringent than previous measurements., Comment: 12 pages, 2 figures, to be submitted to Physical Review D. arXiv admin note: text overlap with arXiv:1905.00608

Published
2020
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15. Measurements of the Absolute Branching Fractions of $B^\pm \to K^\pm X_{c\bar c}$

Author

Lees, J. P., Poireau, V., Tisserand, V., Grauges, E., Palano, A., Eigen, G., Brown, D. N., Kolomensky, Yu. G., Fritsch, M., Koch, H., Schroeder, T., Cheaib, R., Hearty, C., Mattison, T. S., McKenna, J. A., So, R. Y., Blinov, V. E., Buzykaev, A. R., Druzhinin, V. P., Golubev, V. B., Kozyrev, E. A., Kravchenko, E. A., Onuchin, A. P., Serednyakov, S. I., Skovpen, Yu. I., Solodov, E. P., Todyshev, K. Yu., Lankfordm, A. J., Dey, B., Gary, J. W., Long, O., Eisner, A. M., Lockman, W. S., Vazquez, W. Panduro, Chao, D. S., Cheng, C. H., Echenard, B., Flood, K. T., Hitlin, D. G., Kim, J., Li, Y., Miyashita, T. S., Ongmongkolkul, P., Porter, F. C., Rohrken, M., Huard, Z., Meadows, B. T., Pushpawela, B. G., Sokoloff, M. D., Sun, L., Smith, J. G., Wagner, S. R., Bernard, D., Verderi, M., Bettoni, D., Bozzi, C., Calabrese, R., Cibinetto, G., Fioravanti, E., Garzia, I., Luppi, E., Santoro, V., Calcaterra, A., de Sangro, R., Finocchiaro, G., Martellotti, S., Patteri, P., Peruzzi, I. M., Piccolo, M., Rotondo, M., Zallo, A., Passaggio, S., Patrignani, C., Lacker, H. M., Bhuyan, B., Mallik, U., Chen, C., Cochran, J., Prell, S., Gritsan, A. V., Arnaud, N., Davier, M., Diberder, F. Le, Lutz, A. M., Wormser, G., Lange, D. J., Wright, D. M., Coleman, J. P., Hutchcroft, D. E., Payne, D. J., Touramanis, C., Bevan, A. J., Di Lodovico, F., Sacco, R., Cowan, G., Banerjee, Sw., Davis, C. L., Denig, A. G., Gradl, W., Griessinger, K., Hafner, A., Schubert, K. R., Barlow, R. J., Lafferty, G. D., Cenci, R., Jawahery, A., Roberts, D. A., Cowan, R., Robertson, S. H., Seddon, R. M., Neri, N., Palombo, F., Cremaldi, L., Godang, R., Summers, D. J., Taras, P., De Nardo, G., Sciacca, C., Raven, G., Jessop, C. P., LoSecco, J. M., Honscheid, K., Kass, R., Gaz, A., Margoni, M., Posocco, M., Simi, G., Simonetto, F., Stroili, R., Akar, S., Ben-Haim, E., Bomben, M., Bonneaud, G. R., Calderini, G., Chauveau, J., Marchiori, G., Ocariz, J., Biasini, M., Manoni, E., Rossi, A., Batignani, G., Bettarini, S., Carpinelli, M., Casarosa, G., Chrzaszcz, M., Forti, F., Giorgi, M. A., Lusiani, A., Oberhof, B., Paoloni, E., Rama, M., Rizzo, G., Walsh, J. J., Zani, L., Smith, A. J. S., Anulli, F., Faccini, R., Ferrarotto, F., Ferroni, F., Pilloni, A., Piredda, G., Bunger, C., Dittrich, S., Grunberg, O., Hess, M., Leddig, T., Voß, C., Waldi, R., Adye, T., Wilson, F. F., Emery, S., Vasseur, G., Aston, D., Cartaro, C., Convery, M. R., Dorfan, J., Dunwoodie, W., Ebert, M., Field, R. C., Fulsom, B. G., Graham, M. T., Hast, C., Innes, W. R., Kim, P., Leith, D. W. G. S., Luitz, S., MacFarlane, D. B., Muller, D. R., Neal, H., Ratcliff, B. N., Roodman, A., Sullivan, M. K., Va'vra, J., Wisniewski, W. J., Purohit, M. V., Wilson, J. R., Randle-Conde, A., Sekula, S. J., Ahmed, H., Bellis, M., Burchat, P. R., Puccio, E. M. T., Alam, M. S., Ernst, J. A., Gorodeisky, R., Guttman, N., Peimer, D. R., Soffer, A., Spanier, S. M., Ritchie, J. L., Schwitters, R. F., Izen, J. M., Lou, X. C., Bianchi, F., De Mori, F., Filippi, A., Gamba, D., Lanceri, L., Vitale, L., Martinez-Vidal, F., Oyanguren, A., Albert, J., Beaulieu, A., Bernlochner, F. U., King, G. J., Kowalewski, R., Nugent, I. M., Roney, J. M., Sobie, R. J., Tasneem, N., Gershon, T. J., Harrison, P. F., Latham, T. E., Prepost, R., and Wu, S. L.

Subjects
High Energy Physics - Experiment
Abstract

A study of the two body decays $B^\pm\rightarrow X_{c\bar c}K^\pm$, where X$_{c\bar c}$ refers to one charmonium state, is reported by BaBar collaboration using a data sample of 424 fb$^{-1}$. The absolute determination of branching fractions for these decays are significantly improved compared to previous BaBaR measurements. Evidence is found for the decay $B^+\rightarrow X(3872)K^+$ at the $3\sigma$ level. The absolute branching fraction ${\cal B}(B^+\rightarrow X(3872)K^+) = (2.1\pm0.6({\rm stat})\pm0.3({\rm syst}))\times 10^{-4}$ is measured for the first time. It follows that ${\cal B}(X(3872)\rightarrow J/\psi\pi^+\pi^-)=(4.1\pm1.3)\%$, supporting the hypothesis of a molecular component for this resonance., Comment: 8 pages 6 figures

Published
2019
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16. Observation of Radar Echoes From High-Energy Particle Cascades

Author

Prohira, S., de Vries, K. D., Allison, P., Beatty, J., Besson, D., Connolly, A., van Eijndhoven, N., Hast, C., Kuo, C. -Y, Latif, U. A., Meures, T., Nam, J., Nozdrina, A., Ralston, J. P., Riesen, Z., Sbrocco, C., Torres, J., and Wissel, S.

Subjects
Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Instrumentation and Methods for Astrophysics, High Energy Physics - Experiment
Abstract

We report the observation of radar echoes from the ionization trails of high-energy particle cascades. These data were taken at the SLAC National Accelerator Laboratory, where the full electron beam ($\sim$10$^9$ e$^-$ at $\sim$10 GeV/e$^-$) was directed into a plastic target to simulate an ultra high-energy neutrino interaction. This target was interrogated with radio waves, and coherent radio reflections from the cascades were detected, with properties consistent with theoretical expectations. This is the first definitive observation of radar echoes from high-energy particle cascades, which may lead to a viable neutrino detection technology for energies $\gtrsim 10^{16}$ eV., Comment: 6 pages, 4 figures

Published
2019
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17. Search for $B^- \to \Lambda \bar p \nu \bar\nu$ with the BABAR experiment

Author

The BABAR Collaboration, Lees, J. P., Poireau, V., Tisserand, V., Grauges, E., Palano, A., Eigen, G., Brown, D. N., Kolomensky, Yu. G., Fritsch, M., Koch, H., Schroeder, T., Cheaib, R., Hearty, C., Mattison, T. S., McKenna, J. A., So, R. Y., Blinov, V. E., Buzykaev, A. R., Druzhinin, V. P., Golubev, V. B., Kozyrev, E. A., Kravchenko, E. A., Onuchin, A. P., Serednyakov, S. I., Skovpen, Yu. I., Solodov, E. P., Todyshev, K. Yu., Lankford, A. J., Dey, B., Gary, J. W., Long, O., Eisner, A. M., Lockman, W. S., Vazquez, W. Panduro, Chao, D. S., Cheng, C. H., Echenard, B., Flood, K. T., Hitlin, D. G., Kim, J., Li, Y., Miyashita, T. S., Ongmongkolkul, P., Porter, F. C., Röhrken, M., Huard, Z., Meadows, B. T., Pushpawela, B. G., Sokoloff, M. D., Sun, L., Smith, J. G., Wagner, S. R., Bernard, D., Verderi, M., Bettoni, D., Bozzi, C., Calabrese, R., Cibinetto, G., Fioravanti, E., Garzia, I., Luppi, E., Santoro, V., Calcaterra, A., de Sangro, R., Finocchiaro, G., Martellotti, S., Patteri, P., Peruzzi, I. M., Piccolo, M., Rotondo, M., Zallo, A., Passaggio, S., Patrignani, C., Lacker, H. M., Bhuyan, B., Mallik, U., Chen, C., Cochran, J., Prell, S., Gritsan, A. V., Arnaud, N., Davier, M., Diberder, F. Le, Lutz, A. M., Wormser, G., Lange, D. J., Wright, D. M., Coleman, J. P., Gabathuler, E., Hutchcroft, D. E., Payne, D. J., Touramanis, C., Bevan, A. J., Di Lodovico, F., Sacco, R., Cowan, G., Banerjee, Sw., Davis, C. L., Denig, A. G., Gradl, W., Griessinger, K., Hafner, A., Schubert, K. R., Barlow, R. J., Lafferty, G. D., Cenci, R., Jawahery, A., Roberts, D. A., Cowan, R., Robertson, S. H., Seddon, R. M., Neri, N., Palombo, F., Cremaldi, L., Godang, R., Summers, D. J., Taras, P., De Nardo, G., Sciacca, C., Raven, G., Jessop, C. P., LoSecco, J. M., Honscheid, K., Kass, R., Gaz, A., Margoni, M., Posocco, M., Simi, G., Simonetto, F., Stroili, R., Akar, S., Ben-Haim, E., Bomben, M., Bonneaud, G. R., Calderini, G., Chauveau, J., Marchiori, G., Ocariz, J., Biasini, M., Manoni, E., Rossi, A., Batignani, G., Bettarini, S., Carpinelli, M., Casarosa, G., Chrzaszcz, M., Forti, F., Giorgi, M. A., Lusiani, A., Oberhof, B., Paoloni, E., Rama, M., Rizzo, G., Walsh, J. J., Zani, L., Smith, A. J. S., Anulli, F., Faccini, R., Ferrarotto, F., Ferroni, F., Pilloni, A., Piredda, G., Bünger, C., Dittrich, S., Grünberg, O., Heß, M., Leddig, T., Voß, C., Waldi, R., Adye, T., Wilson, F. F., Emery, S., Vasseur, G., Aston, D., Cartaro, C., Convery, M. R., Dorfan, J., Dunwoodie, W., Ebert, M., Field, R. C., Fulsom, B. G., Graham, M. T., Hast, C., Innes, W. R., Kim, P., Leith, D. W. G. S., Luitz, S., MacFarlane, D. B., Muller, D. R., Neal, H., Ratcliff, B. N., Roodman, A., Sullivan, M. K., Va'vra, J., Wisniewski, W. J., Purohit, M. V., Wilson, J. R., Randle-Conde, A., Sekula, S. J., Ahmed, H., Bellis, M., Burchat, P. R., Puccio, E. M. T., Alam, M. S., Ernst, J. A., Gorodeisky, R., Guttman, N., Peimer, D. R., Soffer, A., Spanier, S. M., Ritchie, J. L., Schwitters, R. F., Izen, J. M., Lou, X. C., Bianchi, F., De Mori, F., Filippi, A., Gamba, D., Lanceri, L., Vitale, L., Martinez-Vidal, F., Oyanguren, A., Albert, J., Beaulieu, A., Bernlochner, F. U., King, G. J., Kowalewski, R., Lueck, T., Nugent, I. M., Roney, J. M., Sobie, R. J., Tasneem, N., Gershon, T. J., Harrison, P. F., Latham, T. E., Prepost, R., and Wu, S. L.

Subjects
High Energy Physics - Experiment
Abstract

We search for the rare flavor-changing neutral current process $B^- \to \Lambda {\overline p} \nu{\overline{\nu}}$ using data from the BABAR experiment. A total of 424 fb$^{-1}$ of $e^+e^-$ collision data collected at the center-of-mass energy of the $\Upsilon$(4S) resonance is used in this study, corresponding to a sample of ${(471 \pm 3) \times 10^{6}}$ $B\overline{B}$ pairs. Signal $B^- \to \Lambda {\overline p} \nu{\overline{\nu}}$ candidates are identified by first fully reconstructing a $B^+$ decay in one of many possible exclusive decays to hadronic final states, then examining detector activity that is not associated with this reconstructed $B^+$ decay for evidence of a signal $B^- \to \Lambda {\overline p} \nu{\overline{\nu}}$ decay. The data yield is found to be consistent with the expected background contribution under a null signal hypothesis, resulting in an upper limit of ${{\cal B} (B^- \to \Lambda {\overline p} \nu{\overline{\nu}}) < 3.0\times 10^{-5}}$ at the $90\%$ confidence level., Comment: 10 pages, 7 figures

Published
2019
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18. Search for rare or forbidden decays of the $D^{0}$ meson

Author

Lees, J. P., Poireau, V., Tisserand, V., Grauges, E., Palano, A., Eigen, G., Brown, D. N., Kolomensky, Yu. G., Fritsch, M., Koch, H., Schroeder, T., Cheaib, R., Hearty, C., Mattison, T. S., McKenna, J. A., So, R. Y., Blinov, V. E., Buzykaev, A. R., Druzhinin, V. P., Golubev, V. B., Kozyrev, E. A., Kravchenko, E. A., Onuchin, A. P., Serednyakov, S. I., Skovpen, Yu. I., Solodov, E. P., Todyshev, K. Yu., Lankford, A. J., Dey, B., Gary, J. W., Long, O., Eisner, A. M., Lockman, W. S., Vazquez, W. Panduro, Chao, D. S., Cheng, C. H., Echenard, B., Flood, K. T., Hitlin, D. G., Kim, J., Li, Y., Miyashita, T. S., Ongmongkolkul, P., Porter, F. C., Röhrken, M., Huard, Z., Meadows, B. T., Pushpawela, B. G., Sokoloff, M. D., Sun, L., Smith, J. G., Wagner, S. R., Bernard, D., Verderi, M., Bettoni, D., Bozzi, C., Calabrese, R., Cibinetto, G., Fioravanti, E., Garzia, I., Luppi, E., Santoro, V., Calcaterra, A., de Sangro, R., Finocchiaro, G., Martellotti, S., Patteri, P., Peruzzi, I. M., Piccolo, M., Rotondo, M., Zallo, A., Passaggio, S., Patrignani, C., Lacker, H. M., Bhuyan, B., Mallik, U., Chen, C., Cochran, J., Prell, S., Gritsan, A. V., Arnaud, N., Davier, M., Diberder, F. Le, Lutz, A. M., Wormser, G., Lange, D. J., Wright, D. M., Coleman, J. P., Gabathuler, E., Hutchcroft, D. E., Payne, D. J., Touramanis, C., Bevan, A. J., Di Lodovico, F., Sacco, R., Cowan, G., Banerjee, Sw., Davis, C. L., Denig, A. G., Gradl, W., Griessinger, K., Hafner, A., Schubert, K. R., Barlow, R. J., Lafferty, G. D., Cenci, R., Jawahery, A., Roberts, D. A., Cowan, R., Robertson, S. H., Seddon, R. M., Neri, N., Palombo, F., Cremaldi, L., Godang, R., Summers, D. J., Taras, P., De Nardo, G., Sciacca, C., Raven, G., Jessop, C. P., LoSecco, J. M., Honscheid, K., Kass, R., Gaz, A., Margoni, M., Posocco, M., Simi, G., Simonetto, F., Stroili, R., Akar, S., Ben-Haim, E., Bomben, M., Bonneaud, G. R., Calderini, G., Chauveau, J., Marchiori, G., Ocariz, J., Biasini, M., Manoni, E., Rossi, A., Batignani, G., Bettarini, S., Carpinelli, M., Casarosa, G., Chrzaszcz, M., Forti, F., Giorgi, M. A., Lusiani, A., Oberhof, B., Paoloni, E., Rama, M., Rizzo, G., Walsh, J. J., Zani, L., Smith, A. J. S., Anulli, F., Faccini, R., Ferrarotto, F., Ferroni, F., Pilloni, A., Piredda, G., Bünger, C., Dittrich, S., Grünberg, O., Heß, M., Leddig, T., Voß, C., Waldi, R., Adye, T., Wilson, F. F., Emery, S., Vasseur, G., Aston, D., Cartaro, C., Convery, M. R., Dorfan, J., Dunwoodie, W., Ebert, M., Field, R. C., Fulsom, B. G., Graham, M. T., Hast, C., Innes, W. R., Kim, P., Leith, D. W. G. S., Luitz, S., MacFarlane, D. B., Muller, D. R., Neal, H., Ratcliff, B. N., Roodman, A., Sullivan, M. K., Va'vra, J., Wisniewski, W. J., Purohit, M. V., Wilson, J. R., Randle-Conde, A., Sekula, S. J., Ahmed, H., Bellis, M., Burchat, P. R., Puccio, E. M. T., Alam, M. S., Ernst, J. A., Gorodeisky, R., Guttman, N., Peimer, D. R., Soffer, A., Spanier, S. M., Ritchie, J. L., Schwitters, R. F., Izen, J. M., Lou, X. C., Bianchi, F., De Mori, F., Filippi, A., Gamba, D., Lanceri, L., Vitale, L., Martinez-Vidal, F., Oyanguren, A., Albert, J., Beaulieu, A., Bernlochner, F. U., King, G. J., Kowalewski, R., Lueck, T., Nugent, I. M., Roney, J. M., Sobie, R. J., Tasneem, N., Gershon, T. J., Harrison, P. F., Latham, T. E., Prepost, R., and Wu, S. L.

Subjects
High Energy Physics - Experiment
Abstract

We present a search for nine lepton-number-violating and three lepton-flavor-violating neutral charm decays of the type $D^0\rightarrow h^{\prime -} h^{-}\ell^{\prime +} \ell^{+}$ and $D^0\rightarrow h^{\prime -} h^{+}\ell^{\prime\pm} \ell^{\mp}$, where $h$ and $h^{\prime}$ represent a $K$ or $\pi$ meson and $\ell$ and $\ell^{\prime}$ an electron or muon. The analysis is based on $468$ fb$^{-1}$ of $e^+e^-$ annihilation data collected at or close to the $Y(4S)$ resonance with the BaBar detector at the SLAC National Accelerator Laboratory. No significant signal is observed for any of the twelve modes and we establish 90% confidence level upper limits on the branching fractions in the range $(1.0 - 30.6)\times 10^{-7}$. The limits are between one and three orders of magnitude times more stringent than previous measurements., Comment: 8 pages, 2 figures

Published
2019
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19. Constraints on the ultra-high energy cosmic neutrino flux from the fourth flight of ANITA

Author

Gorham, P. W., Allison, P., Banerjee, O., Batten, L., Beatty, J. J., Belov, K., Besson, D. Z., Binns, W. R., Bugaev, V., Cao, P., Chen, C. C., Chen, C. H., Chen, P., Clem, J. M., Connolly, A., Cremonesi, L., Dailey, B., Deaconu, C., Dowkontt, P. F., Fox, B. D., Gordon, J. W. H., Hast, C., Hill, B., Hsu, S. Y., Huang, J. J., Hughes, K., Hupe, R., Israel, M. H., Liewer, K. M., Liu, T. C., Ludwig, A. B., Macchiarulo, L., Matsuno, S., Miki, C., Mulrey, K., Nam, J., Naudet, C., Nichol, R. J., Novikov, A., Oberla, E., Prohira, S., Rauch, B. F., Roberts, J. M., Romero-Wolf, A., Rotter, B., Russell, J. W., Saltzberg, D., Seckel, D., Schoorlemmer, H., Shiao, J., Stafford, S., Stockham, J., Stockham, M., Strutt, B., Sutherland, M. S., Varner, G. S., Vieregg, A. G., Wang, N., Wang, S. H., and Wissel, S. A.

Subjects
Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

The ANtarctic Impulsive Transient Antenna (ANITA) NASA long-duration balloon payload completed its fourth flight in December 2016, after 28 days of flight time. ANITA is sensitive to impulsive broadband radio emission from interactions of ultra-high-energy neutrinos in polar ice (Askaryan emission). We present the results of two separate blind analyses searching for signals from Askaryan emission in the data from the fourth flight of ANITA. The more sensitive analysis, with a better expected limit, has a background estimate of $0.64^{+0.69}_{-0.45}$ and an analysis efficiency of $82\pm2\%$. The second analysis has a background estimate of $0.34^{+0.66}_{-0.16}$ and an analysis efficiency of $71\pm6\%$. Each analysis found one event in the signal region, consistent with the background estimate for each analysis. The resulting limit further tightens the constraints on the diffuse flux of ultra-high-energy neutrinos at energies above $10^{19.5}$ eV., Comment: 11 pages, 7 figures

Published
2019
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20. A comprehensive analysis of anomalous ANITA events disfavors a diffuse tau-neutrino flux origin

Author

Romero-Wolf, A., Wissel, S. A., Schoorlemmer, H., Carvalho Jr, W. R., Alvarez-Muñiz, J., Zas, E., Allison, P., Banerjee, O., Batten, L., Beatty, J. J., Bechtol, K., Belov, K., Besson, D. Z., Binns, W. R., Bugaev, V., Cao, P., Chen, C. C., Chen, C. H., Chen, P., Clem, J. M., Connolly, A., Cremonesi, L., Dailey, B., Deaconu, C., Dowkontt, P. F., Fox, B. D., Gordon, J. W. H., Gorham, P. W., Hast, C., Hill, B., Hsu, S. Y., Huang, J. J., Hughes, K., Hupe, R., Israel, M. H., Liewer, K. M., Liu, T. C., Ludwig, A. B., Macchiarulo, L., Matsuno, S., Miki, C., Mulrey, K., Nam, J., Naudet, C., Nichol, R. J., Novikov, A., Oberla, E., Prohira, S., Rauch, B. F., Roberts, J. M., Rotter, B., Russell, J. W., Saltzberg, D., Seckel, D., Shiao, J., Stafford, S., Stockham, J., Stockham, M., Strutt, B., Sutherland, M. S., Varner, G. S., Vieregg, A. G., and Wang, S. H.

Subjects
Astrophysics - High Energy Astrophysical Phenomena
Abstract

Recently, the ANITA collaboration reported on two upward-going extensive air shower events consistent with a primary particle that emerges from the surface of the ice. These events may be of $\nu_\tau$ origin, in which the neutrino interacts within the Earth to produce a $\tau$ lepton that emerges from the Earth, decays in the atmosphere, and initiates an extensive air shower. In this paper we estimate an upper bound on the ANITA acceptance to a diffuse $\nu_\tau$ flux detected via $\tau$-lepton-induced air showers within the bounds of Standard Model (SM) uncertainties. By comparing this estimate with the acceptance of Pierre Auger Observatory and IceCube and assuming SM interactions, we conclude that a $\nu_\tau$ origin of these events would imply a neutrino flux at least two orders of magnitude above current bounds., Comment: 12 pages, 7 figures

Published
2018
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21. Suggestion of Coherent Radio Reflections from an Electron-Beam Induced Particle Cascade

Author

Prohira, S., de Vries, K. D., Besson, D., Connolly, A., Hast, C., Latif, U., Meures, T., Ralston, J. P., Riesen, Z., Saltzberg, D., Torres, J., Wissel, S., and Zuo, X.

Subjects
High Energy Physics - Experiment, Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

Testbeam experiment 576 (T576) at the SLAC National Accelerator Laboratory sought to make the first measurement of coherent radio reflections from the ionization produced in the wake of a high-energy particle shower. The >10 GeV electron beam at SLAC End Station A was directed into a large high-density polyethylene target to produce a shower analogous to that produced by an EeV neutrino interaction in ice. Continuous wave (CW) radio was transmitted into the target, and receiving antennas monitored for reflection of the transmitted signal from the ionization left in the wake of the shower. We detail the experiment and report on preliminary hints of a signal consistent with a radio reflection at a significance of 2.36$\sigma$. We recommend another test-beam measurement in order to verify the signal., Comment: To be submitted to PRD

Published
2018
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22. Upward-Pointing Cosmic-Ray-like Events Observed with ANITA

Author

Romero-Wolf, Andres, Gorham, P. W., Nam, J., Hoover, S., Allison, P., Banerjee, O., Batten, L., Beatty, J. J., Belov, K., Besson, D. Z., Binns, W. R., Bugaev, V., Cao, P., Chen, C., Chen, P., Clem, J. M., Connolly, A., Dailey, B., Deaconu, C., Cremonesi, L., Dowkontt, P. F., DuVernois, M. A., Field, R. C., Fox, B. D., Goldstein, D., Gordon, J., Hast, C., Hebert, C. L., Hill, B., Hughes, K., Hupe, R., Israel, M. H., Javaid, A., Kowalski, J., Lam, J., Ludwig, A., Learned, J. G., Liewer, K. M., Liu, T. C., Link, J. T., Lusczek, E., Matsuno, S., Mercurio, B. C., Miki, C., Miocinovic, P., Mottram, M., Mulrey, K., Naudet, C. J., Ng, J., Nichol, R. J., Novikov, A., Palladino, K., Prohira, S., Rauch, B. F., Reil, K., Roberts, J., Rosen, M., Rotter, B., Russell, J., Ruckman, L., Saltzberg, D., Seckel, D., Stafford, S., Stockham, J., Stockham, M., Strutt, B., Tatem, K., Varner, G. S., Vieregg, A. G., Walz, D., Wissel, S. A., Wu, F., Alvarez-Muñiz, J., Carvalho Jr., W., Schoorlemmer, H., and Zas, E.

Subjects
Astrophysics - High Energy Astrophysical Phenomena
Abstract

These proceedings address a recent publication by the ANITA collaboration of four upward- pointing cosmic-ray-like events observed in the first flight of ANITA. Three of these events were consistent with stratospheric cosmic-ray air showers where the axis of propagation does not inter- sect the surface of the Earth. The fourth event was consistent with a primary particle that emerges from the surface of the ice suggesting a possible {\tau}-lepton decay as the origin of this event. These proceedings follow-up on the modeling and testing of the hypothesis that this event was of {\tau} neutrino origin., Comment: 8 pages, 3 figures, presented at the International Cosmic Ray Conference 2017, Busan, South Korea

Published
2018

23. Measurement of $\cos{2\beta}$ in $B^{0} \to D^{(*)} h^{0}$ with $D \to K_{S}^{0} \pi^{+} \pi^{-}$ decays by a combined time-dependent Dalitz plot analysis of BaBar and Belle data

Author

BaBar, The, Collaborations, Belle, Adachi, I., Adye, T., Ahmed, H., Ahn, J. K., Aihara, H., Akar, S., Alam, M. S., Albert, J., Anulli, F., Arnaud, N., Asner, D. M., Aston, D., Atmacan, H., Aushev, T., Ayad, R., Badhrees, I., Bakich, A. M., Banerjee, Sw., Bansal, V., Barlow, R. J., Batignani, G., Beaulieu, A., Behera, P., Bellis, M., Ben-Haim, E., Bernard, D., Bernlochner, F. U., Bettarini, S., Bettoni, D., Bevan, A. J., Bhardwaj, V., Bhuyan, B., Bianchi, F., Biasini, M., Biswal, J., Blinov, V. E., Bomben, M., Bondar, A., Bonneaud, G. R., Bozek, A., Bozzi, C., Bračko, M., Browder, T. E., Brown, D. N., Bünger, C., Burchat, P. R., Buzykaev, A. R., Calabrese, R., Calcaterra, A., Calderini, G., Di Carlo, S., Carpinelli, M., Cartaro, C., Casarosa, G., Cenci, R., Chao, D. S., Chauveau, J., Cheaib, R., Chen, A., Chen, C., Cheng, C. H., Cheon, B. G., Chilikin, K., Cho, K., Choi, Y., Choudhury, S., Chrzaszcz, M., Cibinetto, G., Cinabro, D., Cochran, J., Coleman, J. P., Convery, M. R., Cowan, G., Cowan, R., Cremaldi, L., Cunliffe, S., Dash, N., Davier, M., Davis, C. L., De Mori, F., De Nardo, G., Denig, A. G., de Sangro, R., Dey, B., Di Lodovico, F., Dittrich, S., Doležal, Z., Dorfan, J., Drásal, Z., Druzhinin, V. P., Dunwoodie, W., Ebert, M., Echenard, B., Eidelman, S., Eigen, G., Eisner, A. M., Emery, S., Epifanov, D., Ernst, J. A., Faccini, R., Fast, J. E., Feindt, M., Ferrarotto, F., Ferroni, F., Field, R. C., Filippi, A., Finocchiaro, G., Fioravanti, E., Flood, K. T., Forti, F., Fritsch, M., Fulsom, B. G., Gabathuler, E., Gamba, D., Garg, R., Garmash, A., Gary, J. W., Garzia, I., Gaur, V., Gaz, A., Gelb, M., Gershon, T. J., Gioi, L. Li, Giorgi, M. A., Giri, A., Godang, R., Goldenzweig, P., Golob, B., Golubev, V. B., Gorodeisky, R., Gradl, W., Graham, M. T., Grauges, E., Griessinger, K., Gritsan, A. V., Grünberg, O., Guido, E., Guttman, N., Hafner, A., Hara, T., Harrison, P. F., Hast, C., Hayasaka, K., Hearty, C., Heck, M., Hedges, M. T., Heß, M., Hirose, S., Hitlin, D. G., Honscheid, K., Hou, W. -S., Huard, Z., Van Hulse, C., Hutchcroft, D. E., Inami, K., Inguglia, G., Innes, W. R., Ishikawa, A., Itoh, R., Iwasaki, M., Iwasaki, Y., Izen, J. M., Jacobs, W. W., Jawahery, A., Jessop, C. P., Jia, S., Jin, Y., Joo, K. K., Julius, T., Kaliyar, A. B., Kang, K. H., Karyan, G., Kass, R., Kichimi, H., Kim, D. Y., Kim, J. B., Kim, K. T., Kim, S. H., Kim, J., Kim, P., King, G. J., Kinoshita, K., Koch, H., Kodyš, P., Kolomensky, Yu. G., Korpar, S., Kotchetkov, D., Kowalewski, R., Kravchenko, E. A., Križan, P., Kroeger, R., Krokovny, P., Kuhr, T., Kulasiri, R., Kuzmin, A., Kwon, Y. -J., Lacker, H. M., Lafferty, G. D., Lanceri, L., Lange, J. S., Lange, D. J., Lankford, A. J., Latham, T. E., Leddig, T., Diberder, F. Le, Lee, I. S., Lee, S. C., Lees, J. P., Leith, D. W. G. S., Li, L. K., Li, Y. B., Li, Y., Libby, J., Liventsev, D., Lockman, W. S., Long, O., LoSecco, J. M., Lou, X. C., Lubej, M., Lueck, T., Luitz, S., Luo, T., Luppi, E., Lusiani, A., Lutz, A. M., MacFarlane, D. B., MacNaughton, J., Mallik, U., Manoni, E., Marchiori, G., Margoni, M., Martellotti, S., Martinez-Vidal, F., Masuda, M., Matsuda, T., Mattison, T. S., Matvienko, D., McKenna, J. A., Meadows, B. T., Merola, M., Miyabayashi, K., Miyashita, T. S., Miyata, H., Mizuk, R., Mohanty, G. B., Mori, T., Muller, D. R., Müller, T., Mussa, R., Nakano, E., Nakao, M., Nanut, T., Nath, K. J., Nayak, M., Neal, H., Neri, N., Nisar, N. K., Nishida, S., Nugent, I. M., Oberhof, B., Ocariz, J., Ogawa, S., Ongmongkolkul, P., Ono, H., Onuchin, A. P., Oyanguren, A., Pakhlov, P., Pakhlova, G., Pal, B., Palano, A., Palombo, F., Vazquez, W. Panduro, Paoloni, E., Pardi, S., Park, H., Passaggio, S., Patrignani, C., Patteri, P., Paul, S., Pavelkin, I., Payne, D. J., Pedlar, T. K., Peimer, D. R., Peruzzi, I. M., Piccolo, M., Piilonen, L. E., Pilloni, A., Piredda, G., Poireau, V., Porter, F. C., Posocco, M., Prell, S., Prepost, R., Puccio, E. M. T., Purohit, M. V., Pushpawela, B. G., Rama, M., Randle-Conde, A., Ratcliff, B. N., Raven, G., Resmi, P. K., Ritchie, J. L., Ritter, M., Rizzo, G., Roberts, D. A., Robertson, S. H., Röhrken, M., Roney, J. M., Roodman, A., Rossi, A., Rotondo, M., Rozanska, M., Russo, G., Sacco, R., Said, S. Al, Sakai, Y., Sandilya, S., Santelj, L., Santoro, V., Sanuki, T., Savinov, V., Schneider, O., Schnell, G., Schroeder, T., Schubert, K. R., Schwanda, C., Schwartz, A. J., Schwitters, R. F., Sciacca, C., Seddon, R. M., Seino, Y., Sekula, S. J., Senyo, K., Seon, O., Serednyakov, S. I., Sevior, M. E., Shebalin, V., Shibata, T. -A., Shimizu, N., Shiu, J. -G., Simi, G., Simon, F., Simonetto, F., Skovpen, Yu. I., Smith, J. G., Smith, A. J. S., So, R. Y., Sobie, R. J., Soffer, A., Sokoloff, M. D., Solodov, E. P., Solovieva, E., Spanier, S. M., Starič, M., Stroili, R., Sullivan, M. K., Sumisawa, K., Sumiyoshi, T., Summers, D. J., Sun, L., Takizawa, M., Tamponi, U., Tanida, K., Taras, P., Tasneem, N., Tenchini, F., Tisserand, V., Todyshevx, K. Yu., Touramanis, C., Uchida, M., Uglov, T., Unno, Y., Uno, S., Vahsen, S. E., Varner, G., Vasseur, G., Va'vra, J., Červenkov, D., Verderi, M., Vitale, L., Vorobyev, V., Voß, C., Wagner, S. R., Waheed, E., Waldi, R., Walsh, J. J., Wang, B., Wang, C. H., Wang, M. -Z., Wang, P., Wilson, F. F., Wilson, J. R., Wisniewski, W. J., Won, E., Wormser, G., Wright, D. M., Wu, S. L., Yuan, C. Z., Yusa, Y., Zakharov, S., Zallo, A., Zani, L., Zhang, Z. P., Zhilich, V., Zhukova, V., Zhulanov, V., and Zupanc, A.

Subjects
High Energy Physics - Experiment
Abstract

We report measurements of $\sin{2\beta}$ and $\cos{2\beta}$ from a time-dependent Dalitz plot analysis of $B^{0} \to D^{(*)} h^{0}$ with $D \to K_{S}^{0} \pi^{+} \pi^{-}$ decays, where the light unflavored and neutral hadron $h^{0}$ is a $\pi^{0}$, $\eta$, or $\omega$ meson. The analysis is performed with a combination of the final data sets of the \babar\ and Belle experiments containing $471 \times 10^{6}$ and $772 \times 10^{6}$ $B\bar{B}$ pairs collected at the $\Upsilon\left(4S\right)$ resonance at the asymmetric-energy B factories PEP-II at SLAC and KEKB at KEK, respectively. We measure $\sin{2\beta} = 0.80 \pm 0.14 \,(\rm{stat.}) \pm 0.06 \,(\rm{syst.}) \pm 0.03 \,(\rm{model})$ and $\cos{2\beta} = 0.91 \pm 0.22 \,(\rm{stat.}) \pm 0.09 \,(\rm{syst.}) \pm 0.07 \,(\rm{model})$. The result for the direct measurement of the angle is $\beta = \left( 22.5 \pm 4.4 \,(\rm{stat.}) \pm 1.2 \,(\rm{syst.}) \pm 0.6 \,(\rm{model}) \right)^{\circ}$. The last quoted uncertainties are due to the composition of the $D^{0} \to K_{S}^{0} \pi^{+} \pi^{-}$ decay amplitude model, which is newly established by a Dalitz plot amplitude analysis of a high-statistics $e^{+}e^{-} \to c\bar{c}$ data sample as part of this analysis. We find the first evidence for $\cos2\beta>0$ at the level of $3.7$ standard deviations. The measurement excludes the trigonometric multifold solution $\pi/2 - \beta = (68.1 \pm 0.7)^{\circ}$ at the level of $7.3$ standard deviations and therefore resolves an ambiguity in the determination of the apex of the CKM Unitarity Triangle. The hypothesis of $\beta = 0^{\circ}$ is ruled out at the level of $5.1$ standard deviations, and thus CP violation is observed in $B^{0} \to D^{(*)} h^{0}$ decays., Comment: To be submitted to Physical Review D

Published
2018
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24. First evidence for $\cos 2\beta>0$ and resolution of the CKM Unitarity Triangle ambiguity by a time-dependent Dalitz plot analysis of $B^{0} \to D^{(*)} h^{0}$ with $D \to K_{S}^{0} \pi^{+} \pi^{-}$ decays

Author

BaBar, The, Collaborations, Belle, Adachi, I., Adye, T., Ahmed, H., Ahn, J. K., Aihara, H., Akar, S., Alam, M. S., Albert, J., Anulli, F., Arnaud, N., Asner, D. M., Aston, D., Atmacan, H., Aushev, T., Ayad, R., Babu, V., Badhrees, I., Bakich, A. M., Banerjee, Sw., Bansal, V., Barlow, R. J., Batignani, G., Beaulieu, A., Behera, P., Bellis, M., Ben-Haim, E., Bernard, D., Bernlochner, F. U., Bettarini, S., Bettoni, D., Bevan, A. J., Bhardwaj, V., Bhuyan, B., Bianchi, F., Biasini, M., Biswal, J., Blinov, V. E., Bomben, M., Bondar, A., Bonneaud, G. R., Bozek, A., Bozzi, C., Bračko, M., Browder, T. E., Brown, D. N., Bünger, C., Burchat, P. R., Buzykaev, A. R., Calabrese, R., Calcaterra, A., Calderini, G., Di Carlo, S., Carpinelli, M., Cartaro, C., Casarosa, G., Cenci, R., Chao, D. S., Chauveau, J., Cheaib, R., Chen, A., Chen, C., Cheng, C. H., Cheon, B. G., Chilikin, K., Cho, K., Choi, Y., Choudhury, S., Chrzaszcz, M., Cibinetto, G., Cinabro, D., Cochran, J., Coleman, J. P., Convery, M. R., Cowan, G., Cowan, R., Cremaldi, L., Cunliffe, S., Dash, N., Davier, M., Davis, C. L., De Mori, F., De Nardo, G., Denig, A. G., de Sangro, R., Dey, B., Di Lodovico, F., Dittrich, S., Doležal, Z., Dorfan, J., Drásal, Z., Druzhinin, V. P., Dunwoodie, W., Ebert, M., Echenard, B., Eidelman, S., Eigen, G., Eisner, A. M., Emery, S., Epifanov, D., Ernst, J. A., Faccini, R., Fast, J. E., Feindt, M., Ferber, T., Ferrarotto, F., Ferroni, F., Field, R. C., Filippi, A., Finocchiaro, G., Fioravanti, E., Flood, K. T., Forti, F., Fritsch, M., Fulsom, B. G., Gabathuler, E., Gamba, D., Garg, R., Garmash, A., Gary, J. W., Garzia, I., Gaur, V., Gaz, A., Gelb, M., Gershon, T. J., Gioi, L. Li, Giorgi, M. A., Giri, A., Godang, R., Goldenzweig, P., Golob, B., Golubev, V. B., Gorodeisky, R., Gradl, W., Graham, M. T., Grauges, E., Griessinger, K., Gritsan, A. V., Grünberg, O., Guan, Y., Guido, E., Guttman, N., Haba, J., Hafner, A., Hara, T., Harrison, P. F., Hast, C., Hayasaka, K., Hayashii, H., Hearty, C., Heck, M., Hedges, M. T., Heß, M., Hirose, S., Hitlin, D. G., Honscheid, K., Hou, W. -S., Hsu, C. -L., Huard, Z., Van Hulse, C., Hutchcroft, D. E., Inami, K., Inguglia, G., Innes, W. R., Ishikawa, A., Itoh, R., Iwasaki, M., Iwasaki, Y., Izen, J. M., Jacobs, W. W., Jawahery, A., Jessop, C. P., Jia, S., Jin, Y., Joo, K. K., Julius, T., Kaliyar, A. B., Kang, K. H., Karyan, G., Kass, R., Kichimi, H., Kim, D. Y., Kim, J. B., Kim, K. T., Kim, S. H., Kim, J., Kim, P., King, G. J., Kinoshita, K., Koch, H., Kodyš, P., Kolomensky, Yu. G., Korpar, S., Kotchetkov, D., Kowalewski, R., Kravchenko, E. A., Križan, P., Kroeger, R., Krokovny, P., Kuhr, T., Kulasiri, R., Kumita, T., Kuzmin, A., Kwon, Y. -J., Lacker, H. M., Lafferty, G. D., Lanceri, L., Lange, J. S., Lange, D. J., Lankford, A. J., Latham, T. E., Leddig, T., Diberder, F. Le, Lee, I. S., Lee, S. C., Lees, J. P., Leith, D. W. G. S., Li, L. K., Li, Y. B., Li, Y., Libby, J., Liventsev, D., Lockman, W. S., Long, O., LoSecco, J. M., Lou, X. C., Lubej, M., Lueck, T., Luitz, S., Luo, T., Luppi, E., Lusiani, A., Lutz, A. M., MacFarlane, D. B., MacNaughton, J., Mallik, U., Manoni, E., Marchiori, G., Margoni, M., Martellotti, S., Martinez-Vidal, F., Masuda, M., Matsuda, T., Mattison, T. S., Matvienko, D., McKenna, J. A., Meadows, B. T., Merola, M., Miyabayashi, K., Miyashita, T. S., Miyata, H., Mizuk, R., Mohanty, G. B., Moon, H. K., Mori, T., Muller, D. R., Müller, T., Mussa, R., Nakano, E., Nakao, M., Nanut, T., Nath, K. J., Nayak, M., Neal, H., Neri, N., Nisar, N. K., Nishida, S., Nugent, I. M., Oberhof, B., Ocariz, J., Ogawa, S., Ongmongkolkul, P., Ono, H., Onuchin, A. P., Onuki, Y., Oyanguren, A., Pakhlov, P., Pakhlova, G., Pal, B., Palano, A., Palombo, F., Vazquez, W. Panduro, Paoloni, E., Pardi, S., Park, H., Passaggio, S., Patrignani, C., Patteri, P., Paul, S., Pavelkin, I., Payne, D. J., Pedlar, T. K., Peimer, D. R., Peruzzi, I. M., Pestotnik, R., Piccolo, M., Piilonen, L. E., Pilloni, A., Piredda, G., Poireau, V., Popov, V., Porter, F. C., Posocco, M., Prell, S., Prepost, R., Puccio, E. M. T., Purohit, M. V., Pushpawela, B. G., Rama, M., Randle-Conde, A., Ratcliff, B. N., Raven, G., Resmi, P. K., Ritchie, J. L., Ritter, M., Rizzo, G., Roberts, D. A., Robertson, S. H., Röhrken, M., Roney, J. M., Roodman, A., Rossi, A., Rotondo, M., Rozanska, M., Russo, G., Sacco, R., Said, S. Al, Sakai, Y., Salehi, M., Sandilya, S., Santelj, L., Santoro, V., Sanuki, T., Savinov, V., Schneider, O., Schnell, G., Schroeder, T., Schubert, K. R., Schwanda, C., Schwartz, A. J., Schwitters, R. F., Sciacca, C., Seddon, R. M., Seino, Y., Sekula, S. J., Senyo, K., Seon, O., Serednyakov, S. I., Sevior, M. E., Shebalin, V., Shen, C. P., Shibata, T. -A., Shimizu, N., Shiu, J. -G., Simi, G., Simon, F., Simonetto, F., Skovpen, Yu. I., Smith, J. G., Smith, A. J. S., So, R. Y., Sobie, R. J., Soffer, A., Sokoloff, M. D., Solodov, E. P., Solovieva, E., Spanier, S. M., Starič, M., Stroili, R., Sullivan, M. K., Sumisawa, K., Sumiyoshi, T., Summers, D. J., Sun, L., Takizawa, M., Tamponi, U., Tanida, K., Taras, P., Tasneem, N., Tenchini, F., Tisserand, V., Todyshevx, K. Yu., Touramanis, C., Uchida, M., Uglov, T., Unno, Y., Uno, S., Vahsen, S. E., Varner, G., Vasseur, G., Va'vra, J., Červenkov, D., Verderi, M., Vitale, L., Vorobyev, V., Voß, C., Wagner, S. R., Waheed, E., Waldi, R., Walsh, J. J., Wang, B., Wang, C. H., Wang, M. -Z., Wang, P., Watanabe, Y., Wilson, F. F., Wilson, J. R., Wisniewski, W. J., Won, E., Wormser, G., Wright, D. M., Wu, S. L., Ye, H., Yuan, C. Z., Yusa, Y., Zakharov, S., Zallo, A., Zani, L., Zhang, Z. P., Zhilich, V., Zhukova, V., Zhulanov, V., and Zupanc, A.

Subjects
High Energy Physics - Experiment
Abstract

We present first evidence that the cosine of the CP-violating weak phase $2\beta$ is positive, and hence exclude trigonometric multifold solutions of the CKM Unitarity Triangle using a time-dependent Dalitz plot analysis of $B^{0} \to D^{(*)} h^{0}$ with $D \to K_{S}^{0} \pi^{+} \pi^{-}$ decays, where $h^{0} \in \{\pi^{0}, \eta, \omega \}$ denotes a light unflavored and neutral hadron. The measurement is performed combining the final data sets of the BaBar and Belle experiments collected at the $\Upsilon(4S)$ resonance at the asymmetric-energy B factories PEP-II at SLAC and KEKB at KEK, respectively. The data samples contain $( 471 \pm 3 )\times 10^6\, B\bar{B}$ pairs recorded by the BaBar detector and $( 772 \pm 11 )\times 10^6\, B\bar{B}$ pairs recorded by the Belle detector. The results of the measurement are $\sin{2\beta} = 0.80 \pm 0.14 \,(\rm{stat.}) \pm 0.06 \,(\rm{syst.}) \pm 0.03 \,(\rm{model})$ and $\cos{2\beta} = 0.91 \pm 0.22 \,(\rm{stat.}) \pm 0.09 \,(\rm{syst.}) \pm 0.07 \,(\rm{model})$. The result for the direct measurement of the angle $\beta$ of the CKM Unitarity Triangle is $\beta = \left( 22.5 \pm 4.4 \,(\rm{stat.}) \pm 1.2 \,(\rm{syst.}) \pm 0.6 \,(\rm{model}) \right)^{\circ}$. The quoted model uncertainties are due to the composition of the $D^{0} \to K_{S}^{0} \pi^{+} \pi^{-}$ decay amplitude model, which is newly established by performing a Dalitz plot amplitude analysis using a high-statistics $e^{+}e^{-} \to c\bar{c}$ data sample. CP violation is observed in $B^{0} \to D^{(*)} h^{0}$ decays at the level of $5.1$ standard deviations. The significance for $\cos{2\beta}>0$ is $3.7$ standard deviations. The trigonometric multifold solution $\pi/2 - \beta = (68.1 \pm 0.7)^{\circ}$ is excluded at the level of $7.3$ standard deviations. The measurement resolves an ambiguity in the determination of the apex of the CKM Unitarity Triangle., Comment: To be submitted to Physical Review Letters

Published
2018
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25. Observation of an Unusual Upward-going Cosmic-ray-like Event in the Third Flight of ANITA

Author

Gorham, P. W., Rotter, B., Allison, P., Banerjee, O., Batten, L., Beatty, J. J., Bechtol, K., Belov, K., Besson, D. Z., Binns, W. R., Bugaev, V., Cao, P., Chen, C. C., Chen, C. H., Chen, P., Clem, J. M., Connolly, A., Cremonesi, L., Dailey, B., Deaconu, C., Dowkontt, P. F., Fox, B. D., Gordon, J. W. H., Hast, C., Hill, B., Hughes, K., Huang, J. J., Hupe, R., Israel, M. H., Javaid, A., Lam, J., Liewer, K. M., Lin, S. Y., Liu, T. C., Ludwig, A., Macchiarulo, L., Matsuno, S., Miki, C., Mulrey, K., Nam, J., Naudet, C. J., Nichol, R. J., Novikov, A., Oberla, E., Olmedo, M., Prechelt, R., Prohira, S., Rauch, B. F., Roberts, J. M., Romero-Wolf, A., Russell, J. W., Saltzberg, D., Seckel, D., Schoorlemmer, H., Shiao, J., Stafford, S., Stockham, J., Stockham, M., Strutt, B., Varner, G. S., Vieregg, A. G., Wang, S. H., and Wissel, S. A.

Subjects
Astrophysics - High Energy Astrophysical Phenomena
Abstract

We report on an upward traveling, radio-detected cosmic-ray-like impulsive event with characteristics closely matching an extensive air shower. This event, observed in the third flight of the Antarctic Impulsive Transient Antenna (ANITA), a NASA-sponsored long-duration balloon payload, is consistent with a similar event reported in a previous flight. These events may be produced by the atmospheric decay of an upward-propagating $\tau$-lepton produced by a $\nu_{\tau}$ interaction, although their relatively steep arrival angles create tension with the standard model (SM) neutrino cross section. Each of the two events have $a~posteriori$ background estimates of $\lesssim 10^{-2}$ events. If these are generated by $\tau$-lepton decay, then either the charged-current $\nu_{\tau}$ cross section is suppressed at EeV energies, or the events arise at moments when the peak flux of a transient neutrino source was much larger than the typical expected cosmogenic background neutrinos., Comment: 5 pages, 4 figures. Supplemental material available from corresponding author by request

Published
2018
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26. Constraints on the diffuse high-energy neutrino flux from the third flight of ANITA

Author

Gorham, P. W., Allison, P., Banerjee, O., Batten, L., Beatty, J. J., Bechtol, K., Belov, K., Besson, D. Z., Binns, W. R., Bugaev, V., Cao, P., Chen, C. C., Chen, C. H., Chen, P., Clem, J. M., Connolly, A., Cremonesi, L., Dailey, B., Deaconu, C., Dowkontt, P. F., Fox, B. D., Gordon, J. W. H., Hast, C., Hill, B., Hsu, S. Y., Huang, J. J., Hughes, K., Hupe, R., Israel, M. H., Liewer, K. M., Liu, T. C., Ludwig, A. B., Macchiarulo, L., Matsuno, S., Miki, C., Mulrey, K., Nam, J., Naudet, C., Nichol, R. J., Novikov, A., Oberla, E., Prohira, S., Rauch, B. F., Roberts, J. M., Romero-Wolf, A., Rotter, B., Russell, J. W., Saltzberg, D., Seckel, D., Schoorlemmer, H., Shiao, J., Stafford, S., Stockham, J., Stockham, M., Strutt, B., Sutherland, M. S., Varner, G. S., Vieregg, A. G., Wang, S. H., and Wissel, S. A.

Subjects
Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Instrumentation and Methods for Astrophysics, High Energy Physics - Experiment
Abstract

The Antarctic Impulsive Transient Antenna (ANITA), a NASA long-duration balloon payload, searches for radio emission from interactions of ultra-high-energy neutrinos in polar ice. The third flight of ANITA (ANITA-III) was launched in December 2014 and completed a 22-day flight. We present the results of three analyses searching for Askaryan radio emission of neutrino origin. In the most sensitive of the analyses, we find one event in the signal region on an expected a priori background of $0.7^{+0.5}_{-0.3}$. Though consistent with the background estimate, the candidate event remains compatible with a neutrino hypothesis even after additional post-unblinding scrutiny., Comment: 15 pages, 15 figures, Accepted to PRD

Published
2018
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27. Antarctic Surface Reflectivity Calculations and Measurements from the ANITA-4 and HiCal-2 Experiments

Author

Prohira, S., Novikov, A., Dasgupta, P., Jain, P., Nande, S., Allison, P., Banerjee, O., Batten, L., Beatty, J. J., Belov, K., Besson, D. Z., Binns, W. R., Bugaev, V., Cao, P., Chen, C., Chen, P., Clem, J. M., Connolly, A., Cremonesi, L., Dailey, B., Deaconu, C., Dowkontt, P. F., Fox, B. D., Gordon, J., Gorham, P. W., Hast, C., Hill, B., Hupe, R., Israel, M. H., Lam, J., Liu, T. C., Ludwig, A., Matsuno, S., Miki, C., Mottram, M., Mulrey, K., Nam, J., Nichol, R. J., Oberla, E., Ratzlaff, K., Rauch, B. F., Romero-Wolf, A., Rotter, B., Russell, J., Saltzberg, D., Seckel, D., Schoorlemmer, H., Stafford, S., Stockham, J., Stockham, M., Strutt, B., Tatem, K., Varner, G. S., Vieregg, A. G., Wissel, S. A., Wu, F., and Young, R.

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

The balloon-borne HiCal radio-frequency (RF) transmitter, in concert with the ANITA radio-frequency receiver array, is designed to measure the Antarctic surface reflectivity in the RF wavelength regime. The amplitude of surface-reflected transmissions from HiCal, registered as triggered events by ANITA, can be compared with the direct transmissions preceding them by O(10) microseconds, to infer the surface power reflection coefficient $\cal{R}$. The first HiCal mission (HiCal-1, Jan. 2015) yielded a sample of 100 such pairs, resulting in estimates of $\cal{R}$ at highly-glancing angles (i.e., zenith angles approaching $90^\circ$), with measured reflectivity for those events which exceeded extant calculations. The HiCal-2 experiment, flying from Dec., 2016-Jan., 2017, provided an improvement by nearly two orders of magnitude in our event statistics, allowing a considerably more precise mapping of the reflectivity over a wider range of incidence angles. We find general agreement between the HiCal-2 reflectivity results and those obtained with the earlier HiCal-1 mission, as well as estimates from Solar reflections in the radio-frequency regime. In parallel, our calculations of expected reflectivity have matured; herein, we use a plane-wave expansion to estimate the reflectivity R from both a flat, smooth surface (and, in so doing, recover the Fresnel reflectivity equations) and also a curved surface. Multiplying our flat-smooth reflectivity by improved Earth curvature and surface roughness corrections now provides significantly better agreement between theory and the HiCal 2a/2b measurements., Comment: submitted to Astropart. Phys

Published
2018
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28. HiCal 2: An instrument designed for calibration of the ANITA experiment and for Antarctic surface reflectivity measurements

Author

Prohira, S., Novikov, A., Besson, D. Z., Ratzlaff, K., Stockham, J., Stockham, M., Clem, J. M., Young, R., Gorham, P. W., Allison, P., Banerjee, O., Batten, L., Beatty, J. J., Belov, K., Binns, W. R., Bugaev, V., Cao, P., Chen, C., Chen, P., Connolly, A., Cremonesi, L., Dailey, B., Deaconu, C., Dowkontt, P. F., Fox, B. D., Gordon, J., Hast, C., Hill, B., Hupe, R., Israel, M. H., Kowalski, J., Lam, J., Learned, J. G., Liewer, K. M., Liu, T. C., Ludwig, A., Matsuno, S., Miki, C., Mottram, M., Mulrey, K., Nam, J., Nichol, R. J., Oberla, E., Rauch, B. F., Roberts, J., Romero-Wolf, A., Rotter, B., Russell, J., Saltzberg, D., Schoorlemmer, H., Seckel, D., Stafford, S., Strutt, B., Tatem, K., Varner, G. S., Vieregg, A. G., Wissel, S. A., and Wu, F.

Subjects
Physics - Instrumentation and Detectors
Abstract

The NASA supported High-Altitude Calibration (HiCal)-2 instrument flew as a companion balloon to the ANITA-4 experiment in December 2016. Based on a HV discharge pulser producing radio-frequency (RF) calibration pulses, HiCal-2 comprised two payloads, which flew for a combined 18 days, covering 1.5 revolutions of the Antarctic continent. ANITA-4 captured over 10,000 pulses from HiCal, both direct and reflected from the surface, at distances varying from 100-800 km, providing a large dataset for surface reflectivity measurements. Herein we present details on the design, construction and performance of HiCal-2., Comment: Published in NIM-A, final version

Published
2017
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29. Picosecond timing of Microwave Cherenkov Impulses from High-Energy Particle Showers Using Dielectric-loaded Waveguides

Author

Gorham, P. W., Bynes, J., Fox, B., Hast, C., Hill, B., Jobe, K., Miki, C., Prechelt, R., Rotter, B., Saltzberg, D. P., Wissel, S. A., Varner, G. S., and Zekioglu, S.

Subjects
Physics - Instrumentation and Detectors, High Energy Physics - Experiment
Abstract

We report on the first measurements of coherent microwave impulses from high-energy particle-induced electromagnetic showers generated via the Askaryan effect in a dielectric-loaded waveguide. Bunches of 12.16 GeV electrons with total bunch energy of $\sim 10^3-10^4$ GeV were pre-showered in tungsten, and then measured with WR-51 rectangular (12.6 mm by 6.3 mm) waveguide elements loaded with solid alumina ($Al_2 O_3$) bars. In the 5-8 GHz $TE_{10}$ single-mode band determined by the presence of the dielectric in the waveguide, we observed band-limited microwave impulses with amplitude proportional to bunch energy. Signals in different waveguide elements measuring the same shower were used to estimate relative time differences with 2.3 picosecond precision. These measurements establish a basis for using arrays of alumina-loaded waveguide elements, with exceptional radiation hardness, as very high precision timing planes for high-energy physics detectors., Comment: 16 pages, 15 figures

Published
2017
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30. Wakefield generation in hydrogen and lithium plasmas at FACET-II: Diagnostics and first beam-plasma interaction results

Author

Storey, D., primary, Zhang, C., additional, San Miguel Claveria, P., additional, Cao, G. J., additional, Adli, E., additional, Alsberg, L., additional, Ariniello, R., additional, Clarke, C., additional, Corde, S., additional, Dalichaouch, T. N., additional, Doss, C. E., additional, Ekerfelt, H., additional, Emma, C., additional, Gerstmayr, E., additional, Gessner, S., additional, Gilljohann, M., additional, Hast, C., additional, Knetsch, A., additional, Lee, V., additional, Litos, M., additional, Loney, R., additional, Marsh, K. A., additional, Matheron, A., additional, Mori, W. B., additional, Nie, Z., additional, O’Shea, B., additional, Parker, M., additional, White, G., additional, Yocky, G., additional, Zakharova, V., additional, Hogan, M. J., additional, and Joshi, C., additional

Published
2024
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31. Characteristics of Four Upward-pointing Cosmic-ray-like Events Observed with ANITA

Author

Gorham, P. W., Nam, J., Romero-Wolf, A., Hoover, S., Allison, P., Banerjee, O., Beatty, J. J., Belov, K., Besson, D. Z., Binns, W. R., Bugaev, V., Cao, P., Chen, C., Chen, P., Clem, J. M., Connolly, A., Dailey, B., Deaconu, C., Cremonesi, L., Dowkonnt, P. F., Duvernois, M. A., Field, R. C., Fox, B. D., Goldstein, D., Gordon, J., Hast, C., Hebert, C. L., Hill, B., Hughes, K., Hupe, R., Israel, M. H., Javaid, A., Kowalski, J., Lam, J., Learned, J. G., Liewer, K. M., Liu, T. C., Link, J. T., Lusczek, E., Matsuno, S., Mercurio, B. C., Miki, C., Miocinovic, P., Mottram, M., Mulrey, K., Naudet, C. J., Ng, J., Nichol, R. J., Palladino, K., Rauch, B. F., Reil, K., Roberts, J., Rosen, M., Rotter, B., Russell, J., Ruckman, L., Saltzberg, D., Seckel, D., Schoorlemmer, H., Stafford, S., Stockham, J., Stockham, M., Strutt, B., Tatem, K., Varner, G. S., Vieregg, A. G., Walz, D., Wissel, S. A., and Wu, F.

Subjects
Astrophysics - High Energy Astrophysical Phenomena
Abstract

We report on four radio-detected cosmic-ray (CR) or CR-like events observed with the Antarctic Impulsive Transient Antenna (ANITA), a NASA-sponsored long-duration balloon payload. Two of the four were previously identified as stratospheric CR air showers during the ANITA-I flight. A third stratospheric CR was detected during the ANITA-II flight. Here we report on characteristics these three unusual CR events, which develop nearly horizontally, 20-30~km above the surface of the Earth. In addition, we report on a fourth steeply upward-pointing ANITA-I CR-like radio event which has characteristics consistent with a primary that emerged from the surface of the ice. This suggests a possible $\tau$-lepton decay as the origin of this event, but such an interpretation would require significant suppression of the Standard Model ${\tau}$-neutrino cross section., Comment: 5pp,4 figures, referees' comments addressed, this version accepted to Phys. Rev. Letters. Supplemental PDF material available; see source files

Published
2016
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32. Accelerator measurements of magnetically-induced radio emission from particle cascades with applications to cosmic-ray air showers

Author

Belov, K., Mulrey, K., Romero-Wolf, A., Wissel, S. A., Zilles, A., Bechtol, K., Borch, K., Chen, P., Clem, J., Gorham, P. W., Hast, C., Huege, T., Hyneman, R., Jobe, K., Kuwatani, K., Lam, J., Liu, T., Nam, J., Naudet, C., Nichol, R., Rauch, B. F., Rotter, B., Saltzberg, D., Schoorlemmer, H., Seckel, D., Strutt, B., Vieregg, A. G., and Williams, C.

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics, Astrophysics - High Energy Astrophysical Phenomena, High Energy Physics - Experiment
Abstract

For fifty years, cosmic-ray air showers have been detected by their radio emission. We present the first laboratory measurements that validate electrodynamics simulations used in air shower modeling. An experiment at SLAC provides a beam test of radio-frequency (RF) radiation from charged particle cascades in the presence of a magnetic field, a model system of a cosmic-ray air shower. This experiment provides a suite of controlled laboratory measurements to compare to particle-level simulations of RF emission, which are relied upon in ultra-high-energy cosmic-ray air shower detection. We compare simulations to data for intensity, linearity with magnetic field, angular distribution, polarization, and spectral content. In particular, we confirm modern predictions that the magnetically induced emission in a dielectric forms a cone that peaks at the Cherenkov angle and show that the simulations reproduce the data within systematic uncertainties., Comment: 5 pages, 7 figures

Published
2015
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33. Energy and Flux Measurements of Ultra-High Energy Cosmic Rays Observed During the First ANITA Flight

Author

Schoorlemmer, H., Belov, K., Romero-Wolf, A., García-Fernández, D., Bugaev, V., Wissel, S. A., Allison, P., Alvarez-Muñiz, J., Barwick, S. W., Beatty, J. J., Besson, D. Z., Binns, W. R., Carvalho Jr., W. R., Chen, C., Chen, P., Clem, J. M., Connolly, A., Dowkontt, P. F., DuVernois, M. A., Field, R. C., Goldstein, D., Gorham, P. W., Hast, C., Heber, C. L., Huege, T., Hoover, S., Israel, M. H., Javaid, A., Kowalski, J., Lam, J., Learned, J. G., Liewer, K. M., Link, J. T., Lusczek, E., Matsuno, S., Mercurio, B. C., Miki, C., Miočinović, P., Mulrey, K., Nam, J., Naudet, C. J., Ng, J., Nichol, R. J., Palladino, K., Rauch, B. F., Roberts, J., Reil, K., Rotter, B., Rosen, M., Ruckman, L., Saltzberg, D., Seckel, D., Urdaneta, D., Varner, G. S., Vieregg, A. G., Walz, D., Wu, F., and Zas, E.

Subjects
Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

The first flight of the Antarctic Impulsive Transient Antenna (ANITA) experiment recorded 16 radio signals that were emitted by cosmic-ray induced air showers. For 14 of these events, this radiation was reflected from the ice. The dominant contribution to the radiation from the deflection of positrons and electrons in the geomagnetic field, which is beamed in the direction of motion of the air shower. This radiation is reflected from the ice and subsequently detected by the ANITA experiment at a flight altitude of 36km. In this paper, we estimate the energy of the 14 individual events and find that the mean energy of the cosmic-ray sample is 2.9 EeV. By simulating the ANITA flight, we calculate its exposure for ultra-high energy cosmic rays. We estimate for the first time the cosmic-ray flux derived only from radio observations. In addition, we find that the Monte Carlo simulation of the ANITA data set is in agreement with the total number of observed events and with the properties of those events., Comment: Added more explanation of the experimental setup and textual improvements

Published
2015
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34. First Observation of CP Violation in B0->D(*)CP h0 Decays by a Combined Time-Dependent Analysis of BaBar and Belle Data

Author

BaBar, The, Collaborations, Belle, Abdesselam, A., Adachi, I., Adametz, A., Adye, T., Ahmed, H., Aihara, H., Akar, S., Alam, M. S., Albert, J., Said, S. Al, Andreassen, R., Angelini, C., Anulli, F., Arinstein, K., Arnaud, N., Asner, D. M., Aston, D., Aulchenko, V., Aushev, T., Ayad, R., Babu, V., Badhrees, I., Bahinipati, S., Bakich, A. M., Band, H. R., Banerjee, Sw., Barberio, E., Bard, D. J., Barlow, R. J., Batignani, G., Beaulieu, A., Bellis, M., Ben-Haim, E., Bernard, D., Bernlochner, F. U., Bettarini, S., Bettoni, D., Bevan, A. J., Bhardwaj, V., Bhuyan, B., Bianchi, F., Biasini, M., Biswal, J., Blinov, V. E., Bloom, P. C., Bobrov, A., Bomben, M., Bondar, A., Bonneaud, G. R., Bonvicini, G., Bozek, A., Bozzi, C., Bracko, M., Briand, H., Browder, T. E., Brown, D. N., Bünger, C., Burchat, P. R., Buzykaev, A. R., Calabrese, R., Calcaterra, A., Calderini, G., Carpinelli, M., Cartaro, C., Casarosa, G., Cenci, R., Cervenkov, D., Chang, P., Chao, D. S., Chauveau, J., Cheaib, R., Chekelian, V., Chen, A., Chen, C., Cheng, C. H., Cheon, B. G., Chilikin, K., Chistov, R., Cho, K., Chobanova, V., Choi, H. H. F., Choi, S. -K., Chrzaszcz, M., Cibinetto, G., Cinabro, D., Cochran, J., Coleman, J. P., Contri, R., Convery, M. R., Cowan, G., Cowan, R., Cremaldi, L., Dalseno, J., Dasu, S., Davier, M., Davis, C. L., De Mori, F., De Nardo, G., Denig, A. G., Derkach, D., de Sangro, R., Dey, B., Di Lodovico, F., Dingfelder, J., Dittrich, S., Dolezal, Z., Dorfan, J., Drasal, Z., Drutskoy, A., Druzhinin, V. P., Dubois-Felsmann, G. P., Dunwoodie, W., Dutta, D., Ebert, M., Echenard, B., Eidelman, S., Eigen, G., Eisner, A. M., Emery, S., Ernst, J. A., Faccini, R., Farhat, H., Fast, J. E., Feindt, M., Ferber, T., Ferrarotto, F., Ferroni, F., Field, R. C., Filippi, A., Finocchiaro, G., Fioravanti, E., Flood, K. T., Ford, W. T., Forti, F., Sevilla, M. Franco, Fritsch, M., Fry, J. R., Fulsom, B. G., Gabathuler, E., Gabyshev, N., Gamba, D., Garmash, A., Gary, J. W., Garzia, I., Gaspero, M., Gaur, V., Gaz, A., Gershon, T. J., Getzkow, D., Gillard, R., Gioi, L. Li, Giorgi, M. A., Glattauer, R., Godang, R., Goh, Y. M., Goldenzweig, P., Golob, B., Golubev, V. B., Gorodeisky, R., Gradl, W., Graham, M. T., Grauges, E., Griessinger, K., Gritsan, A. V., Grosdidier, G., Grünberg, O., Guttman, N., Haba, J., Hafner, A., Hamilton, B., Hara, T., Harrison, P. F., Hast, C., Hayasaka, K., Hayashii, H., Hearty, C., He, X. H., Hess, M., Hitlin, D. G., Hong, T. M., Honscheid, K., Hou, W. -S., Hsiung, Y. B., Huard, Z., Hutchcroft, D. E., Iijima, T., Inguglia, G., Innes, W. R., Ishikawa, A., Itoh, R., Iwasaki, Y., Izen, J. M., Jaegle, I., Jawahery, A., Jessop, C. P., Joffe, D., Joo, K. K., Julius, T., Kang, K. H., Kass, R., Kawasaki, T., Kerth, L. T., Khan, A., Kiesling, C., Kim, D. Y., Kim, J. B., Kim, J. H., Kim, K. T., Kim, P., Kim, S. H., Kim, Y. J., King, G. J., Kinoshita, K., Ko, B. R., Koch, H., Kodys, P., Kolomensky, Yu. G., Korpar, S., Kovalskyi, D., Kowalewski, R., Kravchenko, E. A., Krizan, P., Krokovny, P., Kuhr, T., Kumar, R., Kuzmin, A., Kwon, Y. -J., Lacker, H. M., Lafferty, G. D., Lanceri, L., Lange, D. J., Lankford, A. J., Latham, T. E., Leddig, T., Diberder, F. Le, Lee, D. H., Lee, I. S., Lee, M. J., Lees, J. P., Leith, D. W. G. S., Leruste, Ph., Lewczuk, M. J., Lewis, P., Libby, J., Lockman, W. S., Long, O., Pegna, D. Lopes, LoSecco, J. M., Lou, X. C., Lueck, T., Luitz, S., Lukin, P., Luppi, E., Lusiani, A., Luth, V., Lutz, A. M., Lynch, G., MacFarlane, D. B., Malaescu, B., Mallik, U., Manoni, E., Marchiori, G., Margoni, M., Martellotti, S., Martinez-Vidal, F., Masuda, M., Mattison, T. S., Matvienko, D., McKenna, J. A., Meadows, B. T., Miyabayashi, K., Miyashita, T. S., Miyata, H., Mizuk, R., Mohanty, G. B., Moll, A., Monge, M. R., Moon, H. K., Morandin, M., Muller, D. R., Mussa, R., Nakano, E., Nakazawa, H., Nakao, M., Nanut, T., Nayak, M., Neal, H., Neri, N., Nisar, N. K., Nishida, S., Nugent, I. M., Oberhof, B., Ocariz, J., Ogawa, S., Okuno, S., Olaiya, E. O., Olsen, J., Ongmongkolkul, P., Onorato, G., Onuchin, A. P., Onuki, Y., Ostrowicz, W., Oyanguren, A., Pakhlova, G., Pakhlov, P., Palano, A., Pal, B., Palombo, F., Pan, Y., Vazquez, W. Panduro, Paoloni, E., Park, C. W., Park, H., Passaggio, S., Patel, P. M., Patrignani, C., Patteri, P., Payne, D. J., Pedlar, T. K., Peimer, D. R., Peruzzi, I. M., Pesantez, L., Pestotnik, R., Petric, M., Piccolo, M., Piemontese, L., Piilonen, L. E., Pilloni, A., Piredda, G., Playfer, S., Poireau, V., Porter, F. C., Posocco, M., Prasad, V., Prell, S., Prepost, R., Puccio, E. M. T., Pulliam, T., Purohit, M. V., Pushpawela, B. G., Rama, M., Randle-Conde, A., Ratcliff, B. N., Raven, G., Ribezl, E., Richman, J. D., Ritchie, J. L., Rizzo, G., Roberts, D. A., Robertson, S. H., Röhrken, M., Roney, J. M., Roodman, A., Rossi, A., Rostomyan, A., Rotondo, M., Roudeau, P., Sacco, R., Sakai, Y., Sandilya, S., Santelj, L., Santoro, V., Sanuki, T., Sato, Y., Savinov, V., Schindler, R. H., Schneider, O., Schnell, G., Schroeder, T., Schubert, K. R., Schumm, B. A., Schwanda, C., Schwartz, A. J., Schwitters, R. F., Sciacca, C., Seiden, A., Sekula, S. J., Senyo, K., Seon, O., Serednyakov, S. I., Sevior, M. E., Shapkin, M., Shebalin, V., Shen, C. P., Shibata, T. -A., Shiu, J. -G., Simard, M., Simi, G., Simon, F., Simonetto, F., Skovpen, Yu. I., Smith, A. J. S., Smith, J. G., Snyder, A., So, R. Y., Sobie, R. J., Soffer, A., Sohn, Y. -S., Sokoloff, M. D., Sokolov, A., Solodov, E. P., Solovieva, E., Spaan, B., Spanier, S. M., Staric, M., Stocchi, A., Stroili, R., Stugu, B., Su, D., Sullivan, M. K., Sumihama, M., Sumisawa, K., Sumiyoshi, T., Summers, D. J., Sun, L., Tamponi, U., Taras, P., Tasneem, N., Teramoto, Y., Tisserand, V., Todyshev, K. Yu., Toki, W. H., Touramanis, C., Trabelsi, K., Tsuboyama, T., Uchida, M., Uglov, T., Unno, Y., Uno, S., Usov, Y., Uwer, U., Vahsen, S. E., Van Hulse, C., Vanhoefer, P., Varner, G., Vasseur, G., Va'vra, J., Verderi, M., Vinokurova, A., Vitale, L., Vorobyev, V., Voss, C., Wagner, M. N., Wagner, S. R., Waldi, R., Walsh, J. J., Wang, C. H., Wang, M. -Z., Wang, P., Watanabe, Y., West, C. A., Williams, K. M., Wilson, F. F., Wilson, J. R., Wisniewski, W. J., Won, E., Wormser, G., Wright, D. M., Wu, S. L., Wulsin, H. W., Yamamoto, H., Yamaoka, J., Yashchenko, S., Yuan, C. Z., Yusa, Y., Zallo, A., Zhang, C. C., Zhang, Z. P., Zhilich, V., Zhulanov, V., and Zupanc, A.

Subjects
High Energy Physics - Experiment
Abstract

We report a measurement of the time-dependent CP asymmetry of B0->D(*)CP h0 decays, where the light neutral hadron h0 is a pi0, eta or omega meson, and the neutral D meson is reconstructed in the CP eigenstates K+ K-, K0S pi0 or K0S omega. The measurement is performed combining the final data samples collected at the Y(4S) resonance by the BaBar and Belle experiments at the asymmetric-energy B factories PEP-II at SLAC and KEKB at KEK, respectively. The data samples contain ( 471 +/- 3 ) x 10^6 BB pairs recorded by the BaBar detector and ( 772 +/- 11 ) x 10^6, BB pairs recorded by the Belle detector. We measure the CP asymmetry parameters -eta_f S = +0.66 +/- 0.10 (stat.) +/- 0.06 (syst.) and C = -0.02 +/- 0.07 (stat.) +/- 0.03 (syst.). These results correspond to the first observation of CP violation in B0->D(*)CP h0 decays. The hypothesis of no mixing-induced CP violation is excluded in these decays at the level of 5.4 standard deviations., Comment: 9 pages, 2 figures, submitted to Physical Review Letters

Published
2015

35. Energy and flux measurements of ultra-high energy cosmic rays observed during the first ANITA flight

Author

Schoorlemmer, H, Belov, K, Romero-Wolf, A, García-Fernández, D, Bugaev, V, Wissel, SA, Allison, P, Alvarez-Muñiz, J, Barwick, SW, Beatty, JJ, Besson, DZ, Binns, WR, Carvalho, WR, Chen, C, Chen, P, Clem, JM, Connolly, A, Dowkontt, PF, DuVernois, MA, Field, RC, Goldstein, D, Gorham, PW, Hast, C, Huege, T, Heber, CL, Hoover, S, Israel, MH, Javaid, A, Kowalski, J, Lam, J, Learned, JG, Link, JT, Lusczek, E, Matsuno, S, Mercurio, BC, Miki, C, Miočinović, P, Mulrey, K, Nam, J, Naudet, CJ, Ng, J, Nichol, RJ, Palladino, K, Rauch, BF, Roberts, J, Reil, K, Rotter, B, Rosen, M, Ruckman, L, Saltzberg, D, Seckel, D, Urdaneta, D, Varner, GS, Vieregg, AG, Walz, D, Wu, F, and Zas, E

Subjects
Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, Cosmic rays, Air shower, Radio detection, astro-ph.HE, astro-ph.IM, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Nuclear & Particles Physics, Astronomical sciences, Particle and high energy physics
Abstract

The first flight of the Antarctic Impulsive Transient Antenna (ANITA) experiment recorded 16 radio signals that were emitted by cosmic-ray induced air showers. The dominant contribution to the radiation comes from the deflection of positrons and electrons in the geomagnetic field, which is beamed in the direction of motion of the air shower. For 14 of these events, this radiation is reflected from the ice and subsequently detected by the ANITA experiment at a flight altitude of ∼36 km. In this paper, we estimate the energy of the 14 individual events and find that the mean energy of the cosmic-ray sample is 2.9 × 1018 eV, which is significantly lower than the previous estimate. By simulating the ANITA flight, we calculate its exposure for ultra-high energy cosmic rays. We estimate for the first time the cosmic-ray flux derived only from radio observations and find agreement with measurements performed at other observatories. In addition, we find that the ANITA data set is consistent with Monte Carlo simulations for the total number of observed events and with the properties of those events.

Published
2016

36. The Physics of the B Factories

Author

Bevan, A. J., Golob, B., Mannel, Th., Prell, S., Yabsley, B. D., Abe, K., Aihara, H., Anulli, F., Arnaud, N., Aushev, T., Beneke, M., Beringer, J., Bianchi, F., Bigi, I. I., Bona, M., Brambilla, N., rodzicka, J. B, Chang, P., Charles, M. J., Cheng, C. H., Cheng, H. -Y., Chistov, R., Colangelo, P., Coleman, J. P., Drutskoy, A., Druzhinin, V. P., Eidelman, S., Eigen, G., Eisner, A. M., Faccini, R., Flood, K. T ., Gambino, P., Gaz, A., Gradl, W., Hayashii, H., Higuchi, T., Hulsbergen, W. D., Hurth, T., Iijima, T., Itoh, R., Jackson, P. D., Kass, R., Kolomensky, Yu. G., Kou, E., Križan, P., Kronfeld, A., Kumano, S., Kwon, Y. J., Latham, T. E., Leith, D. W. G. S., Lüth, V., Martinez-Vidal, F., Meadows, B. T., Mussa, R., Nakao, M., Nishida, S., Ocariz, J., Olsen, S. L., Pakhlov, P., Pakhlova, G., Palano, A., Pich, A., Playfer, S., Poluektov, A., Porter, F. C., Robertson, S. H., Roney, J. M., Roodman, A., Sakai, Y., Schwanda, C., Schwartz, A. J., Seidl, R., Sekula, S. J., Steinhauser, M., Sumisawa, K., Swanson, E. S., Tackmann, F., Trabelsi, K., Uehara, S., Uno, S., van der Water, R., Vasseur, G., Verkerke, W., Waldi, R., Wang, M. Z., Wilson, F. F., Zupan, J., Zupanc, A., Adachi, I., Albert, J., Banerjee, Sw., Bellis, M., Ben-Haim, E., Biassoni, P., Cahn, R. N., Cartaro, C., Chauveau, J., Chen, C., Chiang, C. C., Cowan, R., Dalseno, J., Davier, M., Davies, C., Dingfelder, J. C., nard, B. Eche, Epifanov, D., Fulsom, B. G., Gabareen, A. M., Gary, J. W., Godang, R., Graham, M. T., Hafner, A., Hamilton, B., Hartmann, T., Hayasaka, K., Hearty, C., Iwasaki, Y., Khodjamirian, A., Kusaka, A., Kuzmin, A., Lafferty, G. D., Lazzaro, A., Li, J., Lindemann, D., Long, O., Lusiani, A., Marchiori, G., Martinelli, M., Miyabayashi, K., Mizuk, R., Mohanty, G. B., Muller, D. R., Nakazawa, H., Ongmongkolkul, P., Pacetti, S., Palombo, F., Pedlar, T. K., Piilonen, L. E., Pilloni, A., Poireau, V., Prothmann, K., Pulliam, T., Rama, M., Ratcliff, B. N., Roudeau, P., Schrenk, S., Schroeder, T., Schubert, K. R., Shen, C. P., Shwartz, B., Soffer, A., Solodov, E. P., Somov, A., Starič, M., Stracka, S., Telnov, A. V., Todyshev, K. Yu., Tsuboyama, T., Uglov, T., Vinokurova, A., Walsh, J. J., Watanabe, Y., Won, E., Wormser, G., Wright, D. H., Ye, S., Zhang, C. C., Abachi, S., Abashian, A., Abe, N., Abe, R., Abe, T., Abrams, G. S., Adam, I., Adamczyk, K., Adametz, A., Adye, T., Agarwal, A., Ahmed, H., Ahmed, M., Ahmed, S., Ahn, B. S., Ahn, H. S., Aitchison, I. J. R., Akai, K., Akar, S., Akatsu, M., Akemoto, M., Akhmetshin, R., Akre, R., Alam, M. S., Albert, J. N., Aleksan, R., Alexander, J. P., Alimonti, G., Allen, M. T., Allison, J., Allmendinger, T., Alsmiller, J. R. G., Altenburg, D., Alwyn, K. E., An, Q., Anderson, J., Andreassen, R., Andreotti, D., Andreotti, M., Andress, J. C., Angelini, C., Anipko, D., Anjomshoaa, A., Anthony, P. L., Antillon, E. A., Antonioli, E., Aoki, K., Arguin, J. F., Arinstein, K., Arisaka, K., Asai, K., Asai, M., Asano, Y., Asgeirsson, D. J., Asner, D. M., Aso, T., Aspinwall, M. L., Aston, D., Atmacan, H., Aubert, B., Aulchenko, V., Ayad, R., Azemoon, T., Aziz, T., Azzolini, V., Azzopardi, D. E., Baak, M. A., Back, J. J., Bagnasco, S., Bahinipati, S., Bailey, D. S., Bailey, S., Bailly, P., van Bakel, N., Bakich, A. M., Bala, A., Balagura, V., Baldini-Ferroli, R., Ban, Y., Banas, E., Band, H. R., Banerjee, S., Baracchini, E., Barate, R., Barberio, E., Barbero, M., Bard, D. J., Barillari, T., Barlow, N. R., Barlow, R. J., Barrett, M., Bartel, W., Bartelt, J., Bartoldus, R., Batignani, G., Battaglia, M., Bauer, J. M., Bay, A., Beaulieu, M., Bechtle, P., Beck, T. W., Becker, J., Becla, J., Bedny, I., Behari, S., Behera, P. K., Behn, E., Behr, L., Beigbeder, C., Beiline, D., Bell, R., Bellini, F., Bellodi, G., Belous, K., Benayoun, M., Benelli, G., Benitez, J. F., Benkebil, M., Berger, N., Bernabeu, J., Bernard, D., Bernet, R., Bernlochner, F. U., Berryhill, J. W., Bertsche, K., Besson, P., Best, D. S., Bettarini, S., Bettoni, D., Bhardwaj, V., Bhimji, W., Bhuyan, B., Biagini, M. E., Biasini, M., van Bibber, K., Biesiada, J., Bingham, I., Bionta, R. M., Bischofberger, M., Bitenc, U., Bizjak, I., Blanc, F., Blaylock, G., Blinov, V. E., Bloom, E., Bloom, P. C., Blount, N. L., Blouw, J., Bly, M., Blyth, S., Boeheim, C. T., Bomben, M., Bondar, A., Bondioli, M., Bonneaud, G. R., Bonvicini, G., Booke, M., Booth, J., Borean, C., Borgland, A. W., Borsato, E., Bosi, F., Bosisio, L., Botov, A. A., Bougher, J., Bouldin, K., Bourgeois, P., Boutigny, D., Bowerman, D. A., Boyarski, A. M., Boyce, R. F., Boyd, J. T., Bozek, A., Bozzi, C., Bračko, M., Brandenburg, G., Brandt, T., Brau, B., Brau, J., Breon, A. B., Breton, D., Brew, C., Briand, H., Bright-Thomas, P. G., Brigljević, V., Britton, D. I., Brochard, F., Broomer, B., Brose, J., Browder, T. E., Brown, C. L., Brown, C. M., Brown, D. N., Browne, M., Bruinsma, M., Brunet, S., Bucci, F., Buchanan, C., Buchmueller, O. L., Bünger, C., Bugg, W., Bukin, A. D., Bula, R., Bulten, H., Burchat, P. R., Burgess, W., Burke, J. P., Button-Shafer, J., Buzykaev, A. R., Buzzo, A., Cai, Y., Calabrese, R., Calcaterra, A., Calderini, G., Camanzi, B., Campagna, E., Campagnari, C., Capra, R., Carassiti, V., Carpinelli, M., Carroll, M., Casarosa, G., Casey, B. C. K., Cason, N. M., Castelli, G., Cavallo, N., Cavoto, G., Cecchi, A., Cenci, R., Cerizza, G., Cervelli, A., Ceseracciu, A., Chai, X., Chaisanguanthum, K. S., Chang, M. C., Chang, Y. H., Chang, Y. W., Chao, D. S., Chao, M., Chao, Y., Charles, E., Chavez, C. A., Cheaib, R., Chekelian, V., Chen, A., Chen, E., Chen, G. P., Chen, H. F., Chen, J. -H., Chen, J. C., Chen, K. F., Chen, P., Chen, S., Chen, W. T., Chen, X., Chen, X. R., Chen, Y. Q., Cheng, B., Cheon, B. G., Chevalier, N., Chia, Y. M., Chidzik, S., Chilikin, K., Chistiakova, M. V., Cizeron, R., Cho, I. S., Cho, K., Chobanova, V., Choi, H. H. F., Choi, K. S., Choi, S. K., Choi, Y., Choi, Y. K., Christ, S., Chu, P. H., Chun, S., Chuvikov, A., Cibinetto, G., Cinabro, D., Clark, A. R., Clark, P. J., Clarke, C. K., Claus, R., Claxton, B., Clifton, Z. C., Cochran, J., Cohen-Tanugi, J., Cohn, H., Colberg, T., Cole, S., Colecchia, F., Condurache, C., Contri, R., Convert, P., Convery, M. R., Cooke, P., Copty, N., Cormack, C. M., Corso, F. Dal, Corwin, L. A., Cossutti, F., Cote, D., Ramusino, A. Cotta, Cottingham, W. N., Couderc, F., Coupal, D. P., Covarelli, R., Cowan, G., Craddock, W. W., Crane, G., Crawley, H. B., Cremaldi, L., Crescente, A., Cristinziani, M., Crnkovic, J., Crosetti, G., Cuhadar-Donszelmann, T., Cunha, A., Curry, S., D'Orazio, A., Dû, S., Dahlinger, G., Dahmes, B., Dallapiccola, C., Danielson, N., Danilov, M., Das, A., Dash, M., Dasu, S., Datta, M., Daudo, F., Dauncey, P. D., David, P., Davis, C. L., Day, C. T., De Mori, F., De Domenico, G., De Groot, N., De la Vaissière, C., de la Vaissière, Ch., de Lesquen, A., De Nardo, G., de Sangro, R., De Silva, A., DeBarger, S., Decker, F. J., Sanchez, P. del Amo, Del Buono, L., Del Gamba, V., del Re, D., Della Ricca, G., Denig, A. G., Derkach, D., Derrington, I. M., DeStaebler, H., Destree, J., Devmal, S., Dey, B., Di Girolamo, B., Di Marco, E., Dickopp, M., Dima, M. O., Dittrich, S., Dittongo, S., Dixon, P., Dneprovsky, L., Dohou, F., Doi, Y., Doležal, Z., Doll, D. A., Donald, M., Dong, L., Dong, L. Y., Dorfan, J., Dorigo, A., Dorsten, M. P., Dowd, R., Dowdell, J., Drásal, Z., Dragic, J., Drummond, B. W., Dubitzky, R. S., Dubois-Felsmann, G. P., Dubrovin, M. S., Duh, Y. C., Duh, Y. T., Dujmic, D., Dungel, W., Dunwoodie, W., Dutta, D., Dvoretskii, A., Dyce, N., Ebert, M., Eckhart, E. A., Ecklund, S., Eckmann, R., Eckstein, P., Edgar, C. L., Edwards, A. J., Egede, U., Eichenbaum, A. 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R., Fujii, H., Fujikawa, M., Fujita, Y., Fujiyama, Y., Fukunaga, C., Fukushima, M., Fullwood, J., Funahashi, Y., Funakoshi, Y., Furano, F., Furman, M., Furukawa, K., Futterschneider, H., Gabathuler, E., Gabriel, T. A., Gabyshev, N., Gaede, F., Gagliardi, N., Gaidot, A., Gaillard, J. -M., Gaillard, J. R., Galagedera, S., Galeazzi, F., Gallo, F., Gamba, D., Gamet, R., Gan, K. K., Gandini, P., Ganguly, S., Ganzhur, S. F., Gao, Y. Y., Gaponenko, I., Garmash, A., Tico, J. Garra, Garzia, I., Gaspero, M., Gastaldi, F., Gatto, C., Gaur, V., Geddes, N. I., Geld, T. L., Genat, J. -F., George, K. A., George, M., George, S., Georgette, Z., Gershon, T. J., Gill, M. S., Gillard, R., Gilman, J. D., Giordano, F., Giorgi, M. A., Giraud, P. -F., Gladney, L., Glanzman, T., Glattauer, R., Go, A., Goetzen, K., Goh, Y. M., Gokhroo, G., Goldenzweig, P., Golubev, V. B., Gopal, G. P., Gordon, A., Gorišek, A., Goriletsky, V. I., Gorodeisky, R., Gosset, L., Gotow, K., Gowdy, S. 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Z., Yèche, Ch., Yamada, Y., Yamaga, M., Yamaguchi, A., Yamaguchi, H., Yamaki, T., Yamamoto, H., Yamamoto, N., Yamamoto, R. K., Yamamoto, S., Yamanaka, T., Yamaoka, H., Yamaoka, J., Yamaoka, Y., Yamashita, Y., Yamauchi, M., Yan, D. S., Yan, Y., Yanai, H., Yanaka, S., Yang, H., Yang, R., Yang, S., Yarritu, A. K., Yashchenko, S., Yashima, J., Yasin, Z., Yasu, Y., Ye, S. W., Yeh, P., Yi, J. I., Yi, K., Yi, M., Yin, Z. W., Ying, J., Yocky, G., Yokoyama, K., Yokoyama, M., Yokoyama, T., Yoshida, K., Yoshida, M., Yoshimura, Y., Young, C. C., Yu, C. X., Yu, Z., Yuan, C. Z., Yuan, Y., Yumiceva, F. X., Yusa, Y., Yushkov, A. N., Yuta, H., Zacek, V., Zain, S. B., Zallo, A., Zambito, S., Zander, D., Zang, S. L., Zanin, D., Zaslavsky, B. G., Zeng, Q. L., Zghiche, A., Zhang, B., Zhang, J., Zhang, L., Zhang, L. M., Zhang, S. Q., Zhang, Z. P., Zhao, H. W., Zhao, M., Zhao, Z. G., Zheng, Y., Zheng, Y. H., Zheng, Z. P., Zhilich, V., Zhou, P., Zhu, R. Y., Zhu, Y. S., Zhu, Z. M., Zhulanov, V., Ziegler, T., Ziegler, V., Zioulas, G., Zisman, M., Zito, M., Zürcher, D., Zwahlen, N., Zyukova, O., Živko, T., and Žontar, D.

Subjects
High Energy Physics - Experiment, High Energy Physics - Phenomenology
Abstract

This work is on the Physics of the B Factories. Part A of this book contains a brief description of the SLAC and KEK B Factories as well as their detectors, BaBar and Belle, and data taking related issues. Part B discusses tools and methods used by the experiments in order to obtain results. The results themselves can be found in Part C. Please note that version 3 on the archive is the auxiliary version of the Physics of the B Factories book. This uses the notation alpha, beta, gamma for the angles of the Unitarity Triangle. The nominal version uses the notation phi_1, phi_2 and phi_3. Please cite this work as Eur. Phys. J. C74 (2014) 3026., Comment: 928 pages, version 3 (arXiv:1406.6311v3) corresponds to the alpha, beta, gamma version of the book, the other versions use the phi1, phi2, phi3 notation

Published
2014
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37. Planning the Future of U.S. Particle Physics (Snowmass 2013): Chapter 8: Instrumentation Frontier

Author

Demarteau, M., Lipton, R., Nicholson, H., Shipsey, I., Akerib, D., Albayrak-Yetkin, A., Alexander, J., Anderson, J., Artuso, M., Asner, D., Ball, R., Battaglia, M., Bebek, C., Beene, J., Benhammou, Y., Bentefour, E., Bergevin, M., Bernstein, A., Bilki, B., Blucher, E., Bolla, G., Bortoletto, D., Bowden, N., Brooijmans, G., Byrum, K., Cabrera, B., Cancelo, G., Carlstrom, J., Casey, B., Chang, C., Chapman, J., Chen, C. H., Childres, I., Christian, D., Convery, M., Corso, W. Cooper J., Cumalat, J., Cushman, P., Da Via, C., Dazeley, S., Debbins, P., Deptuch, G., Dhawan, S., Di Benedetto, V., DiGiovene, B., Djurcic, Z., Dye, S., Elagin, A., Estrada, J., Evans, H., Etzion, E., Fast, J., Ferretti, C., Fisher, P., Fleming, B., Francis, K., Friedman, P., Frisch, H., Garcia-Sciveres, M., Gatto, C., Geronim, G., Gilchriese, G., Golwala, S., Grant, C., Grillo, A., Grünendahl, E., Gorham, P., Guan, L., Gutierrez, G., Haber, C., Hall, J., Haller, G., Hast, C., Heintz, U., Hemmick, T., Hitlin, D. G., Hogan, C., Hohlmann, M., Hoppe, E., Hsu, L., Huffer, M., Irwin, K., Izraelevitch, F., Jennings, G., Johnson, M., Jung, A., Kagan, H., Kenney, C., Kettell, S., Khanna, R., Khristenko, V., Krennrich, F., Kuehn, K., Kutschke, R., Learned, J., Lee, A. T., Levin, D., Liu, T., Liu, A. T. K., Lissauer, D., Love, J., Lynn, D., MacFarlane, D., Magill, S., Majewski, S., Mans, J., Maricic, J., Marleau, P., Mazzacane, A., McKinsey, D., Mehl, J., Mestvirisvilli, A., Meyer, S., Mokhov, N., Moshe, M., Mukherjee, A., Murat, P., Nahn, S., Narain, M., Nadel-Turonski, P., Newcomer, M., Nishimura, K., Nygren, D., Oberla, E., Onel, Y., Oreglia, M., Orrell, J., Paley, J., Para, A., Parker, S., Polychronakos, V., Pordes, S., Privitera, P., Prosser, A., Pyle, M., Raaf, J., Ramberg, E., Rameika, R., Rebel, B., Repond, J., Reyna, D., Ristori, L., Rivera, R., Ronzhin, A., Rusack, R., Russ, J., Ryd, A., Sadrozinski, H., Sahoo, H., Sanchez, M. C., Sanzeni, C., Schnetzer, S., Seidel, S., Seiden, A., Schmidt, I., Shenai, A., Shutt, T., Silver, Y., Smith, W., Snowden-Ifft, D., Sonnenschein, A., Southwick, D., Spiegel, L., Stanitzki, M., Striganov, S., Su, D., Sumner, R., Svoboda, R., Sweany, M., Talaga, R., Tayloe, R., Tentindo, S., Terentiev, N., Thom-Levy, J., Thorn, C., Tiffenberg, J., Trischuk, W., Tschirhart, R., Turner, M., Underwood, D., Uplegger, L., Urheim, J., Vagins, M., Van Bibber, K., Varner, G., Varner, R., Va'vra, J., Von der Lippe, H., Wagner, R., Wagner, S., Weaverdyck, C., Wenzel, H., Weinstein, A., Wetstein, M., White, A., Wigman, R., Wilson, P., Winn, D., Winter, P., Woody, C., Xia, L., Xie, J. Q., Ye, Z., Yeh, M. F., Yetkin, T., Yoo, J. H., Yu, J., Yu, J. M., Zeller, S., Zhang, J. L., Zhu, J. J., Zhou, B., Zhu, R. Y., and Zitzer, B.

Subjects
High Energy Physics - Experiment, High Energy Physics - Phenomenology, Physics - Instrumentation and Detectors
Abstract

These reports present the results of the 2013 Community Summer Study of the APS Division of Particles and Fields ("Snowmass 2013") on the future program of particle physics in the U.S. Chapter 8, on the Instrumentation Frontier, discusses the instrumentation needs of future experiments in the Energy, Intensity, and Cosmic Frontiers, promising new technologies for particle physics research, and issues of gathering resources for long-term research in this area., Comment: 50 pages

Published
2014

38. Search for heavy neutral leptons using tau lepton decays at B a B aR

Author

Lees, J, Poireau, V, Tisserand, V, Grauges, E, Palano, A, Eigen, G, Brown, D, Kolomensky, Y, Fritsch, M, Koch, H, Cheaib, R, Hearty, C, Mattison, T, Mckenna, J, So, R, Blinov, V, Buzykaev, A, Druzhinin, V, Kozyrev, E, Kravchenko, E, Serednyakov, S, Skovpen, Y, Solodov, E, Todyshev, K, Lankford, A, Dey, B, Gary, J, Long, O, Eisner, A, Lockman, W, Panduro Vazquez, W, Chao, D, Cheng, C, Echenard, B, Flood, K, Hitlin, D, Li, Y, Lin, D, Middleton, S, Miyashita, T, Ongmongkolkul, P, Oyang, J, Porter, F, Rohrken, M, Meadows, B, Sokoloff, M, Smith, J, Wagner, S, Bernard, D, Verderi, M, Bettoni, D, Bozzi, C, Calabrese, R, Cibinetto, G, Fioravanti, E, Garzia, I, Luppi, E, Santoro, V, Calcaterra, A, De Sangro, R, Finocchiaro, G, Martellotti, S, Patteri, P, Peruzzi, I, Piccolo, M, Rotondo, M, Zallo, A, Passaggio, S, Patrignani, C, Shuve, B, Lacker, H, Bhuyan, B, Mallik, U, Chen, C, Cochran, J, Prell, S, Gritsan, A, Arnaud, N, Davier, M, Le Diberder, F, Lutz, A, Wormser, G, Lange, D, Wright, D, Coleman, J, Hutchcroft, D, Payne, D, Touramanis, C, Bevan, A, Di Lodovico, F, Cowan, G, Banerjee, S, Davis, C, Denig, A, Gradl, W, Griessinger, K, Hafner, A, Schubert, K, Barlow, R, Lafferty, G, Cenci, R, Jawahery, A, Roberts, D, Cowan, R, Robertson, S, Seddon, R, Neri, N, Palombo, F, Cremaldi, L, Godang, R, Summers, D, De Nardo, G, Sciacca, C, Jessop, C, Losecco, J, Honscheid, K, Gaz, A, Margoni, M, Simi, G, Simonetto, F, Stroili, R, Akar, S, Ben-Haim, E, Bomben, M, Bonneaud, G, Calderini, G, Chauveau, J, Marchiori, G, Ocariz, J, Biasini, M, Manoni, E, Rossi, A, Batignani, G, Bettarini, S, Carpinelli, M, Casarosa, G, Chrzaszcz, M, Forti, F, Giorgi, M, Lusiani, A, Oberhof, B, Paoloni, E, Rama, M, Rizzo, G, Walsh, J, Zani, L, Smith, A, Anulli, F, Faccini, R, Ferrarotto, F, Ferroni, F, Pilloni, A, Bunger, C, Dittrich, S, Grunberg, O, Leddig, T, Voss, C, Waldi, R, Adye, T, Wilson, F, Emery, S, Vasseur, G, Aston, D, Cartaro, C, Convery, M, Ebert, M, Field, R, Fulsom, B, Graham, M, Hast, C, Kim, P, Luitz, S, Macfarlane, D, Muller, D, Neal, H, Ratcliff, B, Roodman, A, Sullivan, M, Va'Vra, J, Wisniewski, W, Purohit, M, Wilson, J, Sekula, S, Ahmed, H, Tasneem, N, Bellis, M, Burchat, P, Puccio, E, Ernst, J, Gorodeisky, R, Guttman, N, Peimer, D, Soffer, A, Spanier, S, Ritchie, J, Izen, J, Lou, X, Bianchi, F, De Mori, F, Filippi, A, Lanceri, L, Vitale, L, Martinez-Vidal, F, Oyanguren, A, Albert, J, Beaulieu, A, Bernlochner, F, King, G, Kowalewski, R, Lueck, T, Miller, C, Nugent, I, Roney, J, Sobie, R, Gershon, T, Harrison, P, Latham, T, Wu, S, Lees J. P., Poireau V., Tisserand V., Grauges E., Palano A., Eigen G., Brown D. N., Kolomensky Y. G., Fritsch M., Koch H., Cheaib R., Hearty C., Mattison T. S., McKenna J. A., So R. Y., Blinov V. E., Buzykaev A. R., Druzhinin V. P., Kozyrev E. A., Kravchenko E. A., Serednyakov S. I., Skovpen Y. I., Solodov E. P., Todyshev K. Y., Lankford A. J., Dey B., Gary J. W., Long O., Eisner A. M., Lockman W. S., Panduro Vazquez W., Chao D. S., Cheng C. H., Echenard B., Flood K. T., Hitlin D. G., Li Y., Lin D. X., Middleton S., Miyashita T. S., Ongmongkolkul P., Oyang J., Porter F. C., Rohrken M., Meadows B. T., Sokoloff M. D., Smith J. G., Wagner S. R., Bernard D., Verderi M., Bettoni D., Bozzi C., Calabrese R., Cibinetto G., Fioravanti E., Garzia I., Luppi E., Santoro V., Calcaterra A., De Sangro R., Finocchiaro G., Martellotti S., Patteri P., Peruzzi I. M., Piccolo M., Rotondo M., Zallo A., Passaggio S., Patrignani C., Shuve B. J., Lacker H. M., Bhuyan B., Mallik U., Chen C., Cochran J., Prell S., Gritsan A. V., Arnaud N., Davier M., Le Diberder F., Lutz A. M., Wormser G., Lange D. J., Wright D. M., Coleman J. P., Hutchcroft D. E., Payne D. J., Touramanis C., Bevan A. J., Di Lodovico F., Cowan G., Banerjee S., Davis C. L., Denig A. G., Gradl W., Griessinger K., Hafner A., Schubert K. R., Barlow R. J., Lafferty G. D., Cenci R., Jawahery A., Roberts D. A., Cowan R., Robertson S. H., Seddon R. M., Neri N., Palombo F., Cremaldi L., Godang R., Summers D. J., De Nardo G., Sciacca C., Jessop C. P., Losecco J. M., Honscheid K., Gaz A., Margoni M., Simi G., Simonetto F., Stroili R., Akar S., Ben-Haim E., Bomben M., Bonneaud G. R., Calderini G., Chauveau J., Marchiori G., Ocariz J., Biasini M., Manoni E., Rossi A., Batignani G., Bettarini S., Carpinelli M., Casarosa G., Chrzaszcz M., Forti F., Giorgi M. A., Lusiani A., Oberhof B., Paoloni E., Rama M., Rizzo G., Walsh J. J., Zani L., Smith A. J. S., Anulli F., Faccini R., Ferrarotto F., Ferroni F., Pilloni A., Bunger C., Dittrich S., Grunberg O., Leddig T., Voss C., Waldi R., Adye T., Wilson F. F., Emery S., Vasseur G., Aston D., Cartaro C., Convery M. R., Ebert M., Field R. C., Fulsom B. G., Graham M. T., Hast C., Kim P., Luitz S., MacFarlane D. B., Muller D. R., Neal H., Ratcliff B. N., Roodman A., Sullivan M. K., Va'vra J., Wisniewski W. J., Purohit M. V., Wilson J. R., Sekula S. J., Ahmed H., Tasneem N., Bellis M., Burchat P. R., Puccio E. M. T., Ernst J. A., Gorodeisky R., Guttman N., Peimer D. R., Soffer A., Spanier S. M., Ritchie J. L., Izen J. M., Lou X. C., Bianchi F., De Mori F., Filippi A., Lanceri L., Vitale L., Martinez-Vidal F., Oyanguren A., Albert J., Beaulieu A., Bernlochner F. U., King G. J., Kowalewski R., Lueck T., Miller C., Nugent I. M., Roney J. M., Sobie R. J., Gershon T. J., Harrison P. F., Latham T. E., Wu S. L., Lees, J, Poireau, V, Tisserand, V, Grauges, E, Palano, A, Eigen, G, Brown, D, Kolomensky, Y, Fritsch, M, Koch, H, Cheaib, R, Hearty, C, Mattison, T, Mckenna, J, So, R, Blinov, V, Buzykaev, A, Druzhinin, V, Kozyrev, E, Kravchenko, E, Serednyakov, S, Skovpen, Y, Solodov, E, Todyshev, K, Lankford, A, Dey, B, Gary, J, Long, O, Eisner, A, Lockman, W, Panduro Vazquez, W, Chao, D, Cheng, C, Echenard, B, Flood, K, Hitlin, D, Li, Y, Lin, D, Middleton, S, Miyashita, T, Ongmongkolkul, P, Oyang, J, Porter, F, Rohrken, M, Meadows, B, Sokoloff, M, Smith, J, Wagner, S, Bernard, D, Verderi, M, Bettoni, D, Bozzi, C, Calabrese, R, Cibinetto, G, Fioravanti, E, Garzia, I, Luppi, E, Santoro, V, Calcaterra, A, De Sangro, R, Finocchiaro, G, Martellotti, S, Patteri, P, Peruzzi, I, Piccolo, M, Rotondo, M, Zallo, A, Passaggio, S, Patrignani, C, Shuve, B, Lacker, H, Bhuyan, B, Mallik, U, Chen, C, Cochran, J, Prell, S, Gritsan, A, Arnaud, N, Davier, M, Le Diberder, F, Lutz, A, Wormser, G, Lange, D, Wright, D, Coleman, J, Hutchcroft, D, Payne, D, Touramanis, C, Bevan, A, Di Lodovico, F, Cowan, G, Banerjee, S, Davis, C, Denig, A, Gradl, W, Griessinger, K, Hafner, A, Schubert, K, Barlow, R, Lafferty, G, Cenci, R, Jawahery, A, Roberts, D, Cowan, R, Robertson, S, Seddon, R, Neri, N, Palombo, F, Cremaldi, L, Godang, R, Summers, D, De Nardo, G, Sciacca, C, Jessop, C, Losecco, J, Honscheid, K, Gaz, A, Margoni, M, Simi, G, Simonetto, F, Stroili, R, Akar, S, Ben-Haim, E, Bomben, M, Bonneaud, G, Calderini, G, Chauveau, J, Marchiori, G, Ocariz, J, Biasini, M, Manoni, E, Rossi, A, Batignani, G, Bettarini, S, Carpinelli, M, Casarosa, G, Chrzaszcz, M, Forti, F, Giorgi, M, Lusiani, A, Oberhof, B, Paoloni, E, Rama, M, Rizzo, G, Walsh, J, Zani, L, Smith, A, Anulli, F, Faccini, R, Ferrarotto, F, Ferroni, F, Pilloni, A, Bunger, C, Dittrich, S, Grunberg, O, Leddig, T, Voss, C, Waldi, R, Adye, T, Wilson, F, Emery, S, Vasseur, G, Aston, D, Cartaro, C, Convery, M, Ebert, M, Field, R, Fulsom, B, Graham, M, Hast, C, Kim, P, Luitz, S, Macfarlane, D, Muller, D, Neal, H, Ratcliff, B, Roodman, A, Sullivan, M, Va'Vra, J, Wisniewski, W, Purohit, M, Wilson, J, Sekula, S, Ahmed, H, Tasneem, N, Bellis, M, Burchat, P, Puccio, E, Ernst, J, Gorodeisky, R, Guttman, N, Peimer, D, Soffer, A, Spanier, S, Ritchie, J, Izen, J, Lou, X, Bianchi, F, De Mori, F, Filippi, A, Lanceri, L, Vitale, L, Martinez-Vidal, F, Oyanguren, A, Albert, J, Beaulieu, A, Bernlochner, F, King, G, Kowalewski, R, Lueck, T, Miller, C, Nugent, I, Roney, J, Sobie, R, Gershon, T, Harrison, P, Latham, T, Wu, S, Lees J. P., Poireau V., Tisserand V., Grauges E., Palano A., Eigen G., Brown D. N., Kolomensky Y. G., Fritsch M., Koch H., Cheaib R., Hearty C., Mattison T. S., McKenna J. A., So R. Y., Blinov V. E., Buzykaev A. R., Druzhinin V. P., Kozyrev E. A., Kravchenko E. A., Serednyakov S. I., Skovpen Y. I., Solodov E. P., Todyshev K. Y., Lankford A. J., Dey B., Gary J. W., Long O., Eisner A. M., Lockman W. S., Panduro Vazquez W., Chao D. S., Cheng C. H., Echenard B., Flood K. T., Hitlin D. G., Li Y., Lin D. X., Middleton S., Miyashita T. S., Ongmongkolkul P., Oyang J., Porter F. C., Rohrken M., Meadows B. T., Sokoloff M. D., Smith J. G., Wagner S. R., Bernard D., Verderi M., Bettoni D., Bozzi C., Calabrese R., Cibinetto G., Fioravanti E., Garzia I., Luppi E., Santoro V., Calcaterra A., De Sangro R., Finocchiaro G., Martellotti S., Patteri P., Peruzzi I. M., Piccolo M., Rotondo M., Zallo A., Passaggio S., Patrignani C., Shuve B. J., Lacker H. M., Bhuyan B., Mallik U., Chen C., Cochran J., Prell S., Gritsan A. V., Arnaud N., Davier M., Le Diberder F., Lutz A. M., Wormser G., Lange D. J., Wright D. M., Coleman J. P., Hutchcroft D. E., Payne D. J., Touramanis C., Bevan A. J., Di Lodovico F., Cowan G., Banerjee S., Davis C. L., Denig A. G., Gradl W., Griessinger K., Hafner A., Schubert K. R., Barlow R. J., Lafferty G. D., Cenci R., Jawahery A., Roberts D. A., Cowan R., Robertson S. H., Seddon R. M., Neri N., Palombo F., Cremaldi L., Godang R., Summers D. J., De Nardo G., Sciacca C., Jessop C. P., Losecco J. M., Honscheid K., Gaz A., Margoni M., Simi G., Simonetto F., Stroili R., Akar S., Ben-Haim E., Bomben M., Bonneaud G. R., Calderini G., Chauveau J., Marchiori G., Ocariz J., Biasini M., Manoni E., Rossi A., Batignani G., Bettarini S., Carpinelli M., Casarosa G., Chrzaszcz M., Forti F., Giorgi M. A., Lusiani A., Oberhof B., Paoloni E., Rama M., Rizzo G., Walsh J. J., Zani L., Smith A. J. S., Anulli F., Faccini R., Ferrarotto F., Ferroni F., Pilloni A., Bunger C., Dittrich S., Grunberg O., Leddig T., Voss C., Waldi R., Adye T., Wilson F. F., Emery S., Vasseur G., Aston D., Cartaro C., Convery M. R., Ebert M., Field R. C., Fulsom B. G., Graham M. T., Hast C., Kim P., Luitz S., MacFarlane D. B., Muller D. R., Neal H., Ratcliff B. N., Roodman A., Sullivan M. K., Va'vra J., Wisniewski W. J., Purohit M. V., Wilson J. R., Sekula S. J., Ahmed H., Tasneem N., Bellis M., Burchat P. R., Puccio E. M. T., Ernst J. A., Gorodeisky R., Guttman N., Peimer D. R., Soffer A., Spanier S. M., Ritchie J. L., Izen J. M., Lou X. C., Bianchi F., De Mori F., Filippi A., Lanceri L., Vitale L., Martinez-Vidal F., Oyanguren A., Albert J., Beaulieu A., Bernlochner F. U., King G. J., Kowalewski R., Lueck T., Miller C., Nugent I. M., Roney J. M., Sobie R. J., Gershon T. J., Harrison P. F., Latham T. E., and Wu S. L.

Abstract

This article presents a model-independent search for an additional, mostly sterile, heavy neutral lepton (HNL), that is capable of mixing with the Standard Model tau neutrino with a mixing strength of jU tau 4j2, corresponding to the absolute square of the extended Pontecorvo-Maki-Nakagawa-Sakata matrix element. Data from the BABAR experiment, with a total integrated luminosity of 424 fb-1, are analyzed using a kinematic approach that makes no assumptions on the model behind the origins of the HNL, its lifetime or decay modes. No significant signal is found. Upper limits on jU tau 4j2 at the 95% confidence level, depend on the HNL mass hypothesis and vary from 2.31 x 10-2 to 5.04 x 10-6 (with all uncertainties considered), across the mass range 100 < m4 < 1300 MeV/c2; the more stringent limits being placed at higher masses.

Published
2023

39. Evidence for the decay B0 --> omega omega and search for B0 --> omega phi

Author

The BABAR Collaboration, Lees, J. P., Poireau, V., Tisserand, V., Grauges, E., Palano, A., Eigen, G., Stugu, B., Brown, D. N., Kerth, L. T., Kolomensky, Yu. G., Lee, M. J., Lynch, G., Koch, H., Schroeder, T., Hearty, C., Mattison, T. S., McKenna, J. A., So, R. Y., Khan, A., Blinov, V. E., Buzykaev, A. R., Druzhinin, V. P., Golubev, V. B., Kravchenko, E. A., Onuchin, A. P., Serednyakov, S. I., Skovpen, Yu. I., Solodov, E. P., Todyshev, K. Yu., Yushkov, A. N., Lankford, A. J., Mandelkern, M., Dey, B., Gary, J. W., Long, O., Campagnari, C., Sevilla, M. Franco, Hong, T. M., Kovalskyi, D., Richman, J. D., West, C. A., Eisner, A. M., Lockman, W. S., Vazquez, W. Panduro, Schumm, B. A., Seiden, A., Chao, D. S., Cheng, C. H., Echenard, B., Flood, K. T., Hitlin, D. G., Miyashita, T. S., Ongmongkolkul, P., Porter, F. C., Andreassen, R., Huard, Z., Meadows, B. T., Pushpawela, B. G., Sokoloff, M. D., Sun, L., Bloom, P. C., Ford, W. T., Gaz, A., Nauenberg, U., Smith, J. G., Wagner, S. R., Ayad, R., Toki, W. H., Spaan, B., Schwierz, R., Bernard, D., Verderi, M., Playfer, S., Bettoni, D., Bozzi, C., Calabrese, R., Cibinetto, G., Fioravanti, E., Garzia, I., Luppi, E., Piemontese, L., Santoro, V., Calcaterra, A., de Sangro, R., Finocchiaro, G., Martellotti, S., Patteri, P., Peruzzi, I. M., Piccolo, M., Rama, M., Zallo, A., Contri, R., Guido, E., Vetere, M. Lo, Monge, M. R., Passaggio, S., Patrignani, C., Robutti, E., Bhuyan, B., Prasad, V., Morii, M., Adametz, A., Uwer, U., Lacker, H. M., Dauncey, P. D., Mallik, U., Chen, C., Cochran, J., Meyer, W. T., Prell, S., Ahmed, H., Gritsan, A. V., Arnaud, N., Davier, M., Derkach, D., Grosdidier, G., Diberder, F. Le, Lutz, A. M., Malaescu, B., Roudeau, P., Stocchi, A., Wormser, G., Lange, D. J., Wright, D. M., Coleman, J. P., Fry, J. R., Gabathuler, E., Hutchcroft, D. E., Payne, D. J., Touramanis, C., Bevan, A. J., Di Lodovico, F., Sacco, R., Cowan, G., Bougher, J., Davis, C. L., Denig, A. G., Fritsch, M., Gradl, W., Griessinger, K., Hafner, A., Prencipe, E., Schubert, K. R., Barlow, R. J., Lafferty, G. D., Cenci, R., Hamilton, B., Jawahery, A., Roberts, D. A., Cowan, R., Dujmic, D., Sciolla, G., Cheaib, R., Patel, P. M., Robertson, S. H., Biassoni, P., Neri, N., Palombo, F., Cremaldi, L., Godang, R., Sonnek, P., Summers, D. J., Simard, M., Taras, P., De Nardo, G., Monorchio, D., Onorato, G., Sciacca, C., Martinelli, M., Raven, G., Jessop, C. P., LoSecco, J. M., Honscheid, K., Kass, R., Brau, J., Frey, R., Sinev, N. B., Strom, D., Torrence, E., Feltresi, E., Margoni, M., Morandin, M., Posocco, M., Rotondo, M., Simi, G., Simonetto, F., Stroili, R., Akar, S., Ben-Haim, E., Bomben, M., Bonneaud, G. R., Briand, H., Calderini, G., Chauveau, J., Leruste, Ph., Marchiori, G., Ocariz, J., Sitt, S., Biasini, M., Manoni, E., Pacetti, S., Rossi, A., Angelini, C., Batignani, G., Bettarini, S., Carpinelli, M., Casarosa, G., Cervelli, A., Chrzaszcz, M., Forti, F., Giorgi, M. A., Lusiani, A., Oberhof, B., Paoloni, E., Perez, A., Rizzo, G., Walsh, J. J., Pegna, D. Lopes, Olsen, J., Smith, A. J. S., Faccini, R., Ferrarotto, F., Ferroni, F., Gaspero, M., Gioi, L. Li, Piredda, G., Buenger, C., Dittrich, S., Gruenberg, O., Hartmann, T., Leddig, T., Voss, C., Waldi, R., Adye, T., Olaiya, E. O., Wilson, F. F., Emery, S., Vasseur, G., Anulli, F., Aston, D., Bard, D. J., Benitez, J. F., Cartaro, C., Convery, M. R., Dorfan, J., Dubois-Felsmann, G. P., Dunwoodie, W., Ebert, M., Field, R. C., Fulsom, B. G., Gabareen, A. M., Graham, M. T., Hast, C., Innes, W. R., Kim, P., Kocian, M. L., Leith, D. W. G. S., Lewis, P., Lindemann, D., Lindquist, B., Luitz, S., Luth, V., Lynch, H. L., MacFarlane, D. B., Muller, D. R., Neal, H., Nelson, S., Perl, M., Pulliam, T., Ratcliff, B. N., Roodman, A., Salnikov, A. A., Schindler, R. H., Snyder, A., Su, D., Sullivan, M. K., Va'vra, J., Wagner, A. P., Wang, W. F., Wisniewski, W. J., Wittgen, M., Wright, D. H., Wulsin, H. W., Ziegler, V., Purohit, M. V., White, R. M., Wilson, J. R., Randle-Conde, A., Sekula, S. J., Bellis, M., Burchat, P. R., Puccio, E. M. T., Alam, M. S., Ernst, J. A., Gorodeisky, R., Guttman, N., Peimer, D. R., Soffer, A., Spanier, S. M., Ritchie, J. L., Ruland, A. M., Schwitters, R. F., Wray, B. C., Izen, J. M., Lou, X. C., Bianchi, F., De Mori, F., Filippi, A., Gamba, D., Zambito, S., Lanceri, L., Vitale, L., Martinez-Vidal, F., Oyanguren, A., Villanueva-Perez, P., Albert, J., Banerjee, Sw., Bernlochner, F. U., Choi, H. H. F., King, G. J., Kowalewski, R., Lewczuk, M. J., Lueck, T., Nugent, I. M., Roney, J. M., Sobie, R. J., Tasneem, N., Gershon, T. J., Harrison, P. F., Latham, T. E., Band, H. R., Dasu, S., Pan, Y., Prepost, R., and Wu, S. L.

Subjects
High Energy Physics - Experiment
Abstract

We describe searches for B meson decays to the charmless vector-vector final states omega omega and omega phi with 471 x 10^6 B Bbar pairs produced in e+ e- annihilation at sqrt(s) = 10.58 GeV using the BABAR detector at the PEP-II collider at the SLAC National Accelerator Laboratory. We measure the branching fraction B(B0 --> omega omega) = (1.2 +- 0.3 +0.3-0.2) x 10^-6, where the first uncertainty is statistical and the second is systematic, corresponding to a significance of 4.4 standard deviations. We also determine the upper limit B(B0 --> omega phi) < 0.7 x 10^-6 at 90% confidence level. These measurements provide the first evidence for the decay B0 --> omega omega, and an improvement of the upper limit for the decay B0 --> omega phi., Comment: 7 pages, 2 postscript figures

Published
2013
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40. Study of the decay $\bar{B}^{0}\rightarrow\Lambda_{c}^{+}\bar{p}\pi^{+}\pi^{-}$ and its intermediate states

Author

The Babar Collaboration, Lees, J. P., Poireau, V., Tisserand, V., Grauges, E., Palano, A., Eigen, G., Stugu, B., Brown, D. N., Kerth, L. T., Kolomensky, Yu. G., Lynch, G., Koch, H., Schroeder, T., Asgeirsson, D. J., Hearty, C., Mattison, T. S., McKenna, J. A., So, R. Y., Khan, A., Blinov, V. E., Buzykaev, A. R., Druzhinin, V. P., Golubev, V. B., Kravchenko, E. A., Onuchin, A. P., Serednyakov, S. I., Skovpen, Yu. I., Solodov, E. P., Todyshev, K. Yu., Yushkov, A. N., Kirkby, D., Lankford, A. J., Mandelkern, M., Atmacan, H., Gary, J. W., Long, O., Vitug, G. M., Campagnari, C., Hong, T. M., Kovalskyi, D., Richman, J. D., West, C. A., Eisner, A. M., Kroseberg, J., Lockman, W. S., Martinez, A. J., Schumm, B. A., Seiden, A., Chao, D. S., Cheng, C. H., Echenard, B., Flood, K. T., Hitlin, D. G., Ongmongkolkul, P., Porter, F. C., Rakitin, A. Y., Andreassen, R., Huard, Z., Meadows, B. T., Sokoloff, M. D., Sun, L., Bloom, P. C., Ford, W. T., Gaz, A., Nauenberg, U., Smith, J. G., Wagner, S. R., Ayad, R., Toki, W. H., Spaan, B., Schubert, K. R., Schwierz, R., Bernard, D., Verderi, M., Clark, P. J., Playfer, S., Bettoni, D., Bozzi, C., Calabrese, R., Cibinetto, G., Fioravanti, E., Garzia, I., Luppi, E., Piemontese, L., Santoro, V., Baldini-Ferroli, R., Calcaterra, A., de Sangro, R., Finocchiaro, G., Patteri, P., Peruzzi, I. M., Piccolo, M., Rama, M., Zallo, A., Contri, R., Guido, E., Vetere, M. Lo, Monge, M. R., Passaggio, S., Patrignani, C., Robutti, E., Bhuyan, B., Prasad, V., Morii, M., Adametz, A., Uwer, U., Lacker, H. M., Lueck, T., Dauncey, P. D., Mallik, U., Chen, C., Cochran, J., Meyer, W. T., Prell, S., Rubin, A. E., Gritsan, A. V., Arnaud, N., Davier, M., Derkach, D., Grosdidier, G., Diberder, F. Le, Lutz, A. M., Malaescu, B., Roudeau, P., Schune, M. H., Stocchi, A., Wormser, G., Lange, D. J., Wright, D. M., Chavez, C. A., Coleman, J. P., Fry, J. R., Gabathuler, E., Hutchcroft, D. E., Payne, D. J., Touramanis, C., Bevan, A. J., Di Lodovico, F., Sacco, R., Sigamani, M., Cowan, G., Davis, C. L., Denig, A. G., Fritsch, M., Gradl, W., Griessinger, K., Hafner, A., Prencipe, E., Barlow, R. J., Jackson, G., Lafferty, G. D., Behn, E., Cenci, R., Hamilton, B., Jawahery, A., Roberts, D. A., Dallapiccola, C., Cowan, R., Dujmic, D., Sciolla, G., Cheaib, R., Lindemann, D., Patel, P. M., Robertson, S. H., Biassoni, P., Neri, N., Palombo, F., Stracka, S., Cremaldi, L., Godang, R., Kroeger, R., Sonnek, P., Summers, D. J., Nguyen, X., Simard, M., Taras, P., De Nardo, G., Monorchio, D., Onorato, G., Sciacca, C., Martinelli, M., Raven, G., Jessop, C. P., LoSecco, J. M., Wang, W. F., Honscheid, K., Kass, R., Brau, J., Frey, R., Sinev, N. B., Strom, D., Torrence, E., Feltresi, E., Gagliardi, N., Margoni, M., Morandin, M., Posocco, M., Rotondo, M., Simi, G., Simonetto, F., Stroili, R., Akar, S., Ben-Haim, E., Bomben, M., Bonneaud, G. R., Briand, H., Calderini, G., Chauveau, J., Hamon, O., Leruste, Ph., Marchiori, G., Ocariz, J., Sitt, S., Biasini, M., Manoni, E., Pacetti, S., Rossi, A., Angelini, C., Batignani, G., Bettarini, S., Carpinelli, M., Casarosa, G., Cervelli, A., Forti, F., Giorgi, M. A., Lusiani, A., Oberhof, B., Perez, A., Rizzo, G., Walsh, J. J., Pegna, D. Lopes, Olsen, J., Smith, A. J. S., Anulli, F., Faccini, R., Ferrarotto, F., Ferroni, F., Gaspero, M., Gioi, L. Li, Mazzoni, M. A., Piredda, G., Bünger, C., Grünberg, O., Hartmann, T., Leddig, T., Schröder, H., Voß, C., Waldi, R., Adye, T., Olaiya, E. O., Wilson, F. F., Emery, S., de Monchenault, G. Hamel, Vasseur, G., Y\`, Ch., Aston, D., Bartoldus, R., Benitez, J. F., Cartaro, C., Convery, M. R., Dorfan, J., Dubois-Felsmann, G. P., Dunwoodie, W., Ebert, M., Field, R. C., Sevilla, M. Franco, Fulsom, B. G., Gabareen, A. M., Graham, M. T., Grenier, P., Hast, C., Innes, W. R., Kelsey, M. H., Kim, P., Kocian, M. L., Leith, D. W. G. S., Lewis, P., Lindquist, B., Luitz, S., Luth, V., Lynch, H. L., MacFarlane, D. B., Muller, D. R., Neal, H., Nelson, S., Perl, M., Pulliam, T., Ratcliff, B. N., Roodman, A., Salnikov, A. A., Schindler, R. H., Snyder, A., Su, D., Sullivan, M. K., Va'vra, J., Wagner, A. P., Wisniewski, W. J., Wittgen, M., Wright, D. H., Wulsin, H. W., Young, C. C., Ziegler, V., Park, W., Purohit, M. V., White, R. M., Wilson, J. R., Randle-Conde, A., Sekula, S. J., Bellis, M., Burchat, P. R., Miyashita, T. S., Puccio, E. M. T., Alam, M. S., Ernst, J. A., Gorodeisky, R., Guttman, N., Peimer, D. R., Soffer, A., Spanier, S. M., Ritchie, J. L., Ruland, A. M., Schwitters, R. F., Wray, B. C., Izen, J. M., Lou, X. C., Bianchi, F., Gamba, D., Zambito, S., Lanceri, L., Vitale, L., Martinez-Vidal, F., Oyanguren, A., Villanueva-Perez, P., Ahmed, H., Albert, J., Banerjee, Sw., Bernlochner, F. U., Choi, H. H. F., King, G. J., Kowalewski, R., Lewczuk, M. J., Nugent, I. M., Roney, J. M., Sobie, R. J., Tasneem, N., Gershon, T. J., Harrison, P. F., Latham, T. E., Band, H. R., Dasu, S., Pan, Y., Prepost, R., and Wu, S. L.

Subjects
High Energy Physics - Experiment
Abstract

We study the decay $\bar{B}^{0}\rightarrow\Lambda_{c}^{+}\bar{p}\pi^{+}\pi^{-}$, reconstructing the \Lambda_{c}^{+} baryon in the $p K^{-}\pi^{+}$ mode, using a data sample of $467\times 10^{6}$ $B\bar{B}$ pairs collected with the BaBar detector at the PEP-2 storage rings at SLAC. We measure branching fractions for decays with intermediate $\Sigma_{c}$ baryons to be ${\cal B}[\bar{B}^{0}\rightarrow\Sigma_{c}(2455)^{++}\bar{p}\pi^{-}]=(21.3 \pm 1.0 \pm 1.0 \pm 5.5) \times 10^{-5}$, ${\cal B}[\bar{B}^{0}\rightarrow\Sigma_{c}(2520)^{++}\bar{p}\pi^{-}]=(11.5\pm 1.0 \pm 0.5 \pm 3.0)\times 10^{-5}$, ${\cal B}[\bar{B}^{0}\rightarrow\Sigma_{c}(2455)^{0}\bar{p}\pi^{+}]=(9.1 \pm 0.7 \pm 0.4 \pm 2.4)\times10^{-5}$, and ${\cal B}[\bar{B}^{0}\rightarrow\Sigma_{c}(2520)^{0}\bar{p}\pi^{+}]= (2.2 \pm 0.7 \pm 0.1\pm 0.6) \times 10^{-5}$, where the uncertainties are statistical, systematic, and due to the uncertainty on the $\Lambda_{c}^{+}\rightarrow\proton\Km\pi^{+}$ branching fraction, respectively. For decays without $\Sigma_{c}(2455)$ or $\Sigma_{c}(2520)$ resonances, we measure ${\cal B}[\bar{B}^{0}\rightarrow\Lambda_{c}^{+}\bar{p}\pi^{+}\pi^{-}]_{\mathrm{non-\Sigma_{c}}}=(79 \pm 4 \pm 4 \pm 20)\times10^{-5}$. The total branching fraction is determined to be ${\cal B}[\bar{B}^{0}\rightarrow\Lambda_{c}^{+}\bar{p}\pi^{+}\pi^{-}]_{\mathrm{total}}=(123 \pm 5 \pm 7 \pm 32)\times10^{-5}$. We examine multibody mass combinations in the resonant three-particle $\Sigma_{c}\bar{p}\pi$ final states and in the four-particle $\Lambda_{c}^{+}\bar{p}\pi^{+}\pi^{-}$ final state, and observe different characteristics for the $\bar{p}\pi$ combination in neutral versus doubly-charged $\Sigma_{c}$ decays., Comment: 20 pages, 30 figures

Published
2013
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41. Proposal for Single-Bunch Collimator Wakefield Measurements at SLAC ESTB

Author

Resta-Lopez, J., Clarke, C. I., Faus-Golfe, A., Fuster-Martinez, N., Hast, C., Jones, R. M., Latina, A., Pivi, M., Rumolo, G., Schulte, D., Smith, J., and Tomas, R.

Subjects
Physics - Accelerator Physics
Abstract

Collimator wakefields in the Beam Delivery System (BDS) of future linear colliders, such as the International Linear Collider (ILC) and the Compact Linear Collider (CLIC), can be an important source of emittance growth and beam jitter amplification, consequently degrading the luminosity. Therefore, a better understanding of collimator wakefield effects is essential to optimise the collimation systems of future linear colliders in order to minimise wakefield effects. In the past, measurements of single-bunch collimator wakefields have been carried out at SLAC with the aim of benchmarking theory, numerical calculations and experiments. Those studies revealed some discrepancies between the measurements and the theoretical models. New experimental tests using available beam test facilities, such as the End Station A Test Beam (ESTB) at SLAC, would help to improve our understanding on collimator wakefields. ESTB will provide the perfect test bed to investigate collimator wakefields for different bunch length conditions, relevant for both ILC (300 micrometers nominal bunch length) and CLIC (44 micrometers nominal bunch length) studies. Here we propose to perform new experimental tests of collimator wakefield effects on electron/positron beams at SLAC ESTB., Comment: 22 pages, 19 figures

Published
2012

42. Search for direct CP-violation in singly-Cabibbo suppressed D+- --> K+ K- pi+- decays

Author

BaBar Collaboration, Lees, J. P., Poireau, V., Tisserand, V., Tico, J. Garra, Grauges, E., Palano, A., Eigen, G., Stugu, B., Brown, D. N., Kerth, L. T., Kolomensky, Yu. G., Lynch, G., Koch, H., Schroeder, T., Asgeirsson, D. J., Hearty, C., Mattison, T. S., McKenna, J. A., So, R. Y., Khan, A., Blinov, V. E., Buzykaev, A. R., Druzhinin, V. P., Golubev, V. B., Kravchenko, E. A., Onuchin, A. P., Serednyakov, S. I., Skovpen, Yu. I., Solodov, E. P., Todyshev, K. Yu., Yushkov, A. N., Bondioli, M., Kirkby, D., Lankford, A. J., Mandelkern, M., Atmacan, H., Gary, J. W., Liu, F., Long, O., Vitug, G. M., Campagnari, C., Hong, T. M., Kovalskyi, D., Richman, J. D., West, C. A., Eisner, A. M., Kroseberg, J., Lockman, W. S., Martinez, A. J., Schumm, B. A., Seiden, A., Chao, D. S., Cheng, C. H., Echenard, B., Flood, K. T., Hitlin, D. G., Ongmongkolkul, P., Porter, F. C., Rakitin, A. Y., Andreassen, R., Huard, Z., Meadows, B. T., Sokoloff, M. D., Sun, L., Bloom, P. C., Ford, W. T., Gaz, A., Nauenberg, U., Smith, J. G., Wagner, S. R., Ayad, R., Toki, W. H., Spaan, B., Schubert, K. R., Schwierz, R., Bernard, D., Verderi, M., Clark, P. J., Playfer, S., Bettoni, D., Bozzi, C., Calabrese, R., Cibinetto, G., Fioravanti, E., Garzia, I., Luppi, E., Piemontese, L., Santoro, V., Baldini-Ferroli, R., Calcaterra, A., de Sangro, R., Finocchiaro, G., Patteri, P., Piccolo, M., Rama, M., Zallo, A., Contri, R., Guido, E., Vetere, M. Lo, Monge, M. R., Passaggio, S., Patrignani, C., Robutti, E., Bhuyan, B., Prasad, V., Lee, C. L., Morii, M., Edwards, A. J., Adametz, A., Uwer, U., Lacker, H. M., Lueck, T., Dauncey, P. D., Mallik, U., Chen, C., Cochran, J., Meyer, W. T., Prell, S., Rubin, A. E., Gritsan, A. V., Guo, Z. J., Arnaud, N., Davier, M., Derkach, D., Grosdidier, G., Diberder, F. Le, Lutz, A. M., Malaescu, B., Roudeau, P., Schune, M. H., Stocchi, A., Wormser, G., Lange, D. J., Wright, D. M., Chavez, C. A., Coleman, J. P., Fry, J. R., Gabathuler, E., Hutchcroft, D. E., Payne, D. J., Touramanis, C., Bevan, A. J., Di Lodovico, F., Sacco, R., Sigamani, M., Cowan, G., Davis, C. L., Denig, A. G., Fritsch, M., Gradl, W., Griessinger, K., Hafner, A., Prencipe, E., Barlow, R. J., Jackson, G., Lafferty, G. D., Behn, E., Cenci, R., Hamilton, B., Jawahery, A., Roberts, D. A., Dallapiccola, C., Cowan, R., Dujmic, D., Sciolla, G., Cheaib, R., Lindemann, D., Patel, P. M., Robertson, S. H., Biassoni, P., Neri, N., Palombo, F., Stracka, S., Cremaldi, L., Godang, R., Kroeger, R., Sonnek, P., Summers, D. J., Nguyen, X., Simard, M., Taras, P., De Nardo, G., Monorchio, D., Onorato, G., Sciacca, C., Martinelli, M., Raven, G., Jessop, C. P., LoSecco, J. M., Wang, W. F., Honscheid, K., Kass, R., Brau, J., Frey, R., Sinev, N. B., Strom, D., Torrence, E., Feltresi, E., Gagliardi, N., Margoni, M., Morandin, M., Posocco, M., Rotondo, M., Simi, G., Simonetto, F., Stroili, R., Akar, S., Ben-Haim, E., Bomben, M., Bonneaud, G. R., Briand, H., Calderini, G., Chauveau, J., Hamon, O., Leruste, Ph., Marchiori, G., Ocariz, J., Sitt, S., Biasini, M., Manoni, E., Pacetti, S., Rossi, A., Angelini, C., Batignani, G., Bettarini, S., Carpinelli, M., Casarosa, G., Cervelli, A., Forti, F., Giorgi, M. A., Lusiani, A., Oberhof, B., Paoloni, E., Perez, A., Rizzo, G., Walsh, J. J., Pegna, D. Lopes, Olsen, J., Smith, A. J. S., Telnov, A. V., Anulli, F., Faccini, R., Ferrarotto, F., Ferroni, F., Gaspero, M., Gioi, L. Li, Mazzoni, M. A., Piredda, G., Bunger, C., Grunberg, O., Hartmann, T., Leddig, T., Voss, C., Waldi, R., Adye, T., Olaiya, E. O., Wilson, F. F., Emery, S., de Monchenault, G. Hamel, Vasseur, G., Yeche, Ch., Aston, D., Bard, D. J., Bartoldus, R., Benitez, J. F., Cartaro, C., Convery, M. R., Dorfan, J., Dubois-Felsmann, G. P., Dunwoodie, W., Ebert, M., Field, R. C., Sevilla, M. Franco, Fulsom, B. G., Gabareen, A. M., Graham, M. T., Grenier, P., Hast, C., Innes, W. R., Kelsey, M. H., Kim, P., Kocian, M. L., Leith, D. W. G. S., Lewis, P., Lindquist, B., Luitz, S., Luth, V., Lynch, H. L., MacFarlane, D. B., Muller, D. R., Neal, H., Nelson, S., Perl, M., Pulliam, T., Ratcliff, B. N., Roodman, A., Salnikov, A. A., Schindler, R. H., Snyder, A., Su, D., Sullivan, M. K., Va'vra, J., Wagner, A. P., Wisniewski, W. J., Wittgen, M., Wright, D. H., Wulsin, H. W., Young, C. C., Ziegler, V., Park, W., Purohit, M. V., White, R. M., Wilson, J. R., Randle-Conde, A., Sekula, S. J., Bellis, M., Burchat, P. R., Miyashita, T. S., Puccio, E. M. T., Alam, M. S., Ernst, J. A., Gorodeisky, R., Guttman, N., Peimer, D. R., Soffer, A., Lund, P., Spanier, S. M., Ritchie, J. L., Ruland, A. M., Schwitters, R. F., Wray, B. C., Izen, J. M., Lou, X. C., Bianchi, F., Gamba, D., Zambito, S., Lanceri, L., Vitale, L., Martinez-Vidal, F., Oyanguren, A., Villanueva-Perez, P., Ahmed, H., Albert, J., Banerjee, Sw., Bernlochner, F. U., Choi, H. H. F., King, G. J., Kowalewski, R., Lewczuk, M. J., Nugent, I. M., Roney, J. M., Sobie, R. J., Tasneem, N., Gershon, T. J., Harrison, P. F., Latham, T. E., Band, H. R., Dasu, S., Pan, Y., Prepost, R., and Wu, S. L.

Subjects
High Energy Physics - Experiment
Abstract

We report on a search for direct CP asymmetry in the singly Cabibbo-suppressed decay D+- --> K+ K- pi+- using a data sample of 476 fb-1 accumulated with the BaBar detector running at and just below the Y(4S) resonance. The CP-violating decay rate asymmetry A_CP is determined to be (0.35 +- 0.30 +- 0.15)%. Model-dependent and model-independent Dalitz plot analysis techniques are used to search for CP-violating asymmetries in the various intermediate states., Comment: 14 pages, 6 eps figures, to be submitted to PRD

Published
2012
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43. Branching fraction and form-factor shape measurements of exclusive charmless semileptonic B decays, and determination of |V_{ub}

Author

BABAR Collaboration, Lees, J. P., Poireau, V., Tisserand, V., Tico, J. Garra, Grauges, E., Palano, A., Eigen, G., Stugu, B., Brown, D. N., Kerth, L. T., Kolomensky, Yu. G., Lynch, G., Koch, H., Schroeder, T., Asgeirsson, D. J., Hearty, C., Mattison, T. S., McKenna, J. A., So, R. Y., Khan, A., Blinov, V. E., Buzykaev, A. R., Druzhinin, V. P., Golubev, V. B., Kravchenko, E. A., Onuchin, A. P., Serednyakov, S. I., Skovpen, Yu. I., Solodov, E. P., Todyshev, K. Yu., Yushkov, A. N., Bondioli, M., Kirkby, D., Lankford, A. J., Mandelkern, M., Atmacan, H., Gary, J. W., Liu, F., Long, O., Vitug, G. M., Campagnari, C., Hong, T. M., Kovalskyi, D., Richman, J. D., West, C. A., Eisner, A. M., Kroseberg, J., Lockman, W. S., Martinez, A. J., Schumm, B. A., Seiden, A., Chao, D. S., Cheng, C. H., Echenard, B., Flood, K. T., Hitlin, D. G., Ongmongkolkul, P., Porter, F. C., Rakitin, A. Y., Andreassen, R., Huard, Z., Meadows, B. T., Sokoloff, M. D., Sun, L., Bloom, P. C., Ford, W. T., Gaz, A., Nauenberg, U., Smith, J. G., Wagner, S. R., Ayad, R., Toki, W. H., Spaan, B., Schubert, K. R., Schwierz, R., Bernard, D., Verderi, M., Clark, P. J., Playfer, S., Bettoni, D., Bozzi, C., Calabrese, R., Cibinetto, G., Fioravanti, E., Garzia, I., Luppi, E., Munerato, M., Piemontese, L., Santoro, V., Baldini-Ferroli, R., Calcaterra, A., de Sangro, R., Finocchiaro, G., Patteri, P., Peruzzi, I. M., Piccolo, M., Rama, M., Zallo, A., Contri, R., Guido, E., Vetere, M. Lo, Monge, M. R., Passaggio, S., Patrignani, C., Robutti, E., Bhuyan, B., Prasad, V., Lee, C. L., Morii, M., Edwards, A. J., Adametz, A., Uwer, U., Lacker, H. M., Lueck, T., Dauncey, P. D., Mallik, U., Chen, C., Cochran, J., Meyer, W. T., Prell, S., Rubin, A. E., Gritsan, A. V., Guo, Z. J., Arnaud, N., Davier, M., Derkach, D., Grosdidier, G., Diberder, F. Le, Lutz, A. M., Malaescu, B., Roudeau, P., Schune, M. H., Stocchi, A., Wormser, G., Lange, D. J., Wright, D. M., Chavez, C. A., Coleman, J. P., Fry, J. R., Gabathuler, E., Hutchcroft, D. E., Payne, D. J., Touramanis, C., Bevan, A. J., Di Lodovico, F., Sacco, R., Sigamani, M., Cowan, G., Davis, C. L., Denig, A. G., Fritsch, M., Gradl, W., Griessinger, K., Hafner, A., Prencipe, E., Barlow, R. J., Jackson, G., Lafferty, G. D., Behn, E., Cenci, R., Hamilton, B., Jawahery, A., Roberts, D. A., Dallapiccola, C., Cowan, R., Dujmic, D., Sciolla, G., Cheaib, R., Lindemann, D., Patel, P. M., Robertson, S. H., Biassoni, P., Neri, N., Palombo, F., Stracka, S., Cremaldi, L., Godang, R., Kroeger, R., Sonnek, P., Summers, D. J., Nguyen, X., Simard, M., Taras, P., De Nardo, G., Monorchio, D., Onorato, G., Sciacca, C., Martinelli, M., Raven, G., Jessop, C. P., LoSecco, J. M., Wang, W. F., Honscheid, K., Kass, R., Brau, J., Frey, R., Sinev, N. B., Strom, D., Torrence, E., Feltresi, E., Gagliardi, N., Margoni, M., Morandin, M., Posocco, M., Rotondo, M., Simi, G., Simonetto, F., Stroili, R., Akar, S., Ben-Haim, E., Bomben, M., Bonneaud, G. R., Briand, H., Calderini, G., Chauveau, J., Hamon, O., Leruste, Ph., Marchiori, G., Ocariz, J., Sitt, S., Biasini, M., Manoni, E., Pacetti, S., Rossi, A., Angelini, C., Batignani, G., Bettarini, S., Carpinelli, M., Casarosa, G., Cervelli, A., Forti, F., Giorgi, M. A., Lusiani, A., Oberhof, B., Paoloni, E., Perez, A., Rizzo, G., Walsh, J. J., Pegna, D. Lopes, Olsen, J., Smith, A. J. S., Telnov, A. V., Anulli, F., Faccini, R., Ferrarotto, F., Ferroni, F., Gaspero, M., Gioi, L. Li, Mazzoni, M. A., Piredda, G., Bünger, C., Grünberg, O., Hartmann, T., Leddig, T., Voß, C., Waldi, R., Adye, T., Olaiya, E. O., Wilson, F. F., Emery, S., de Monchenault, G. Hamel, Vasseur, G., Yèche, Ch., Aston, D., Bard, D. J., Bartoldus, R., Benitez, J. F., Cartaro, C., Convery, M. R., Dorfan, J., Dubois-Felsmann, G. P., Dunwoodie, W., Ebert, M., Field, R. C., Sevilla, M. Franco, Fulsom, B. G., Gabareen, A. M., Graham, M. T., Grenier, P., Hast, C., Innes, W. R., Kelsey, M. H., Kim, P., Kocian, M. L., Leith, D. W. G. S., Lewis, P., Lindquist, B., Luitz, S., Luth, V., Lynch, H. L., MacFarlane, D. B., Muller, D. R., Neal, H., Nelson, S., Perl, M., Pulliam, T., Ratcliff, B. N., Roodman, A., Salnikov, A. A., Schindler, R. H., Snyder, A., Su, D., Sullivan, M. K., Va'vra, J., Wagner, A. P., Wisniewski, W. J., Wittgen, M., Wright, D. H., Wulsin, H. W., Young, C. C., Ziegler, V., Park, W., Purohit, M. V., White, R. M., Wilson, J. R., Randle-Conde, A., Sekula, S. J., Bellis, M., Burchat, P. R., Miyashita, T. S., Puccio, E. M. T., Alam, M. S., Ernst, J. A., Gorodeisky, R., Guttman, N., Peimer, D. R., Soffer, A., Lund, P., Spanier, S. M., Ritchie, J. L., Ruland, A. M., Schwitters, R. F., Wray, B. C., Izen, J. M., Lou, X. C., Bianchi, F., Gamba, D., Zambito, S., Lanceri, L., Vitale, L., Martinez-Vidal, F., Oyanguren, A., Villanueva-Perez, P., Ahmed, H., Albert, J., Banerjee, Sw., Bernlochner, F. U., Choi, H. H. F., King, G. J., Kowalewski, R., Lewczuk, M. J., Nugent, I. M., Roney, J. M., Sobie, R. J., Tasneem, N., Gershon, T. J., Harrison, P. F., Latham, T. E., Band, H. R., Dasu, S., Pan, Y., Prepost, R., and Wu, S. L.

Subjects
High Energy Physics - Experiment
Abstract

We report the results of a study of the exclusive charmless semileptonic decays, B^0 --> pi^- l^+ nu, B^+ --> pi^0 l^+ nu, B^+ --> omega l^+ nu, B^+ --> eta l^+ nu and B^+ --> eta^' l^+ nu, (l = e or mu) undertaken with approximately 462x10^6 B\bar{B} pairs collected at the Upsilon(4S) resonance with the BABAR detector. The analysis uses events in which the signal B decays are reconstructed with a loose neutrino reconstruction technique. We obtain partial branching fractions in several bins of q^2, the square of the momentum transferred to the lepton-neutrino pair, for B^0 --> pi^- l^+ nu, B^+ --> pi^0 l^+ nu, B^+ --> omega l^+ nu and B^+ --> eta l^+ nu. From these distributions, we extract the form-factor shapes f_+(q^2) and the total branching fractions BF(B^0 --> pi^- l^+ nu) = (1.45 +/- 0.04_{stat} +/- 0.06_{syst})x10^-4 (combined pi^- and pi^0 decay channels assuming isospin symmetry), BF(B^+ --> omega l^+ nu) = (1.19 +/- 0.16_{stat} +/- 0.09_{syst})x10^-4 and BF(B^+ --> eta l^+ nu) = (0.38 +/- 0.05_{stat} +/- 0.05_{syst})x10^-4. We also measure BF(B^+ --> eta^' l^+ nu) = (0.24 +/- 0.08_{stat} +/- 0.03_{syst})x10^-4. We obtain values for the magnitude of the CKM matrix element V_{ub} by direct comparison with three different QCD calculations in restricted q^2 ranges of B --> pi l^+ nu decays. From a simultaneous fit to the experimental data over the full q^2 range and the FNAL/MILC lattice QCD predictions, we obtain |V_{ub}| = (3.25 +/- 0.31)x10^-3, where the error is the combined experimental and theoretical uncertainty., Comment: 35 pages, 14 figures, submitted to PRD

Published
2012
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44. Observation of Time Reversal Violation in the B0 Meson System

Author

The BABAR Collaboration, Lees, J. P., Poireau, V., Tisserand, V., Tico, J. Garra, Grauges, E., Palanoab, A., Eigen, G., Stugu, B., Brown, D. N., Kerth, L. T., Kolomensky, Yu. G., Lynch, G., Koch, H., Schroeder, T., Asgeirsson, D. J., Hearty, C., Mattison, T. S., McKenna, J. A., So, R. Y., Khan, A., Blinov, V. E., Buzykaev, A. R., Druzhinin, V. P., Golubev, V. B., Kravchenko, E. A., Onuchin, A. P., Serednyakov, S. I., Skovpen, Yu. I., Solodov, E. P., Todyshev, K. Yu., Yushkov, A. N., Bondioli, M., Kirkby, D., Lankford, A. J., Mandelkern, M., Atmacan, H., Gary, J. W., Liu, F., Long, O., Vitug, G. M., Campagnari, C., Hong, T. M., Kovalskyi, D., Richman, J. D., West, C. A., Eisner, A. M., Kroseberg, J., Lockman, W. S., Martinez, A. J., Schumm, B. A., Seiden, A., Chao, D. S., Cheng, C. H., Echenard, B., Flood, K. T., Hitlin, D. G., Ongmongkolkul, P., Porter, F. C., Rakitin, A. Y., Andreassen, R., Huard, Z., Meadows, B. T., Sokoloff, M. D., Sun, L., Bloom, P. C., Ford, W. T., Gaz, A., Nauenberg, U., Smith, J. G., Wagner, S. R., Ayad, R., Toki, W. H., Spaan, B., Schubert, K. R., Schwierz, R., Bernard, D., Verderi, M., Clark, P. J., Playfer, S., Bettoni, D., Bozzi, C., Calabrese, R., Cibinetto, G., Fioravanti, E., Garzia, I., Luppi, E., Munerato, M., Piemontese, L., Santoro, V., Baldini-Ferroli, R., Calcaterra, A., de Sangro, R., Finocchiaro, G., Patteri, P., Peruzzi, I. M., Piccolo, M., Rama, M., Zallo, A., Contri, R., Guido, E., Vetere, M. Lo, Monge, M. R., Passaggio, S., Patrignani, C., Robutti, E., Bhuyan, B., Prasad, V., Lee, C. L., Morii, M., Edwards, A. J., Adametz, A., Uwer, U., Lacker, H. M., Lueck, T., Dauncey, P. D., Mallik, U., Chen, C., Cochran, J., Meyer, W. T., Prell, S., Rubin, A. E., Gritsan, A. V., Guo, Z. J., Arnaud, N., Davier, M., Derkach, D., Grosdidier, G., Diberder, F. Le, Lutz, A. M., Malaescu, B., Roudeau, P., Schune, M. H., Stocchi, A., Wormser, G., Lange, D. J., Wright, D. M., Chavez, C. A., Coleman, J. P., Fry, J. R., Gabathuler, E., Hutchcroft, D. E., Payne, D. J., Touramanis, C., Bevan, A. J., Di Lodovico, F., Sacco, R., Sigamani, M., Cowan, G., Davis, C. L., Denig, A. G., Fritsch, M., Gradl, W., Griessinger, K., Hafner, A., Prencipe, E., Barlow, R. J., Jackson, G., Lafferty, G. D., Behn, E., Cenci, R., Hamilton, B., Jawahery, A., Roberts, D. A., Dallapiccola, C., Cowan, R., Dujmic, D., Sciolla, G., Cheaib, R., Lindemann, D., Patel, P. M., Robertson, S. H., Biassoni, P., Neri, N., Palombo, F., Stracka, S., Cremaldi, L., Godang, R., Kroeger, R., Sonnek, P., Summers, D. J., Nguyen, X., Simard, M., Taras, P., De Nardo, G., Monorchio, D., Onorato, G., Sciacca, C., Martinelli, M., Raven, G., Jessop, C. P., LoSecco, J. M., Wang, W. F., Honscheid, K., Kass, R., Brau, J., Frey, R., Sinev, N. B., Strom, D., Torrence, E., Feltresi, E., Gagliardi, N., Margoni, M., Morandin, M., Pompili, A., Posocco, M., Rotondo, M., Simi, G., Simonetto, F., Stroili, R., Akar, S., Ben-Haim, E., Bomben, M., Bonneaud, G. R., Briand, H., Calderini, G., Chauveau, J., Hamon, O., Leruste, Ph., Marchiori, G., Ocariz, J., Sitt, S., Biasini, M., Manoni, E., Pacetti, S., Rossi, A., Angelini, C., Batignani, G., Bettarini, S., Carpinelli, M., Casarosa, G., Cervelli, A., Forti, F., Giorgi, M. A., Lusiani, A., Oberhof, B., Paoloni, E., Perez, A., Rizzo, G., Walsh, J. J., Pegna, D. Lopes, Olsen, J., Smith, A. J. S., Telnov, A. V., Anullia, F., Faccini, R., Ferrarotto, F., Ferroni, F., Gaspero, M., Gioi, L. Li, Mazzoni, M. A., Piredda, G., Bunger, C., Grunberg, O., Hartmann, T., Leddig, T., Schroder, H., Voss, C., Waldi, R., Adye, T., Olaiya, E. O., Wilson, F. F., Emery, S., de Monchenault, G. Hamel, Vasseur, G., Y`eche, Ch., Aston, D., Bard, D. J., Bartoldus, R., Benitez, J. F., Cartaro, C., Convery, M. R., Dorfan, J., Dubois-Felsmann, G. P., Dunwoodie, W., Ebert, M., Field, R. C., Sevilla, M. Franco, Fulsom, B. G., Gabareen, A. M., Graham, M. T., Grenier, P., Hast, C., Innes, W. R., Kelsey, M. H., Kim, P., Kocian, M. L., Leith, D. W. G. S., Lewis, P., Lindquist, B., Luitz, S., Luth, V., Lynch, H. L., MacFarlane, D. B., Muller, D. R., Neal, H., Nelson, S., Perl, M., Pulliam, T., Ratcliff, B. N., Roodman, A., Salnikov, A. A., Schindler, R. H., Snyder, A., Su, D., Sullivan, M. K., Va'vra, J., Wagner, A. P., Wisniewski, W. J., Wittgen, M., Wright, D. H., Wulsin, H. W., Young, C. C., Ziegler, V., Park, W., Purohit, M. V., White, R. M., Wilson, J. R., Randle-Conde, A., Sekula, S. J., Bellis, M., Burchat, P. R., Miyashita, T. S., Puccio, E. M. T., Alam, M. S., Ernst, J. A., Gorodeisky, R., Guttman, N., Peimer, D. R., Soffer, A., Lund, P., Spanier, S. M., Ritchie, J. L., Ruland, A. M., Schwitters, R. F., Wray, B. C., Izen, J. M., Lou, X. C., Bianchi, F., Gamba, D., Zambito, S., Lanceri, L., Vitale, L., Bernabeu, J., Martinez-Vidal, F., Oyanguren, A., Villanueva-Perez, P., Ahmed, H., Albert, J., Banerjee, Sw., Bernlochner, F. U., Choi, H. H. F., King, G. J., Kowalewski, R., Lewczuk, M. J., Nugent, I. M., Roney, J. M., Sobie, R. J., Tasneem, N., Gershon, T. J., Harrison, P. F., Latham, T. E., Band, H. R., Dasu, S., Pan, Y., Prepost, R., and Wu, S. L.

Subjects
High Energy Physics - Experiment
Abstract

Although CP violation in the B meson system has been well established by the B factories, there has been no direct observation of time reversal violation. The decays of entangled neutral B mesons into definite flavor states ($B^0$ or $\bar{B}^0$), and $J/\psi K_S^0$ or $c\bar{c} K_S^0$ final states (referred to as $B_+$ or $B_-$), allow comparisons between the probabilities of four pairs of T-conjugated transitions, for example, $\bar{B}^0 \rightarrow B_-$ and $B_- \rightarrow \bar{B}^0$, as a function of the time difference between the two B decays. Using 468 million $B\bar{B}$ pairs produced in $\Upsilon(4S)$ decays collected by the BABAR detector at SLAC, we measure T-violating parameters in the time evolution of neutral B mesons, yielding $\Delta S_T^+ = -1.37 \pm 0.14 (stat.) \pm 0.06 (syst.)$ and $\Delta S_T^- = 1.17 \pm 0.18 (stat.) \pm 0.11 (syst.)$. These nonzero results represent the first direct observation of T violation through the exchange of initial and final states in transitions that can only be connected by a T-symmetry transformation., Comment: 7 pages, 3 postscript figures, 1 table, appendix with 4 pages containing supplementary material. Accepted by Phys. Rev. Lett

Published
2012
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45. Initial-State Radiation Measurement of the e+e- -> pi+pi-pi+pi- Cross Section

Author

Lees, J. P., Poireau, V., Tisserand, V., Tico, J. Garra, Grauges, E., Martinelli, M., Milanes, D. A., Palano, A., Pappagallo, M., Eigen, G., Stugu, B., Brown, D. N., Kerth, L. T., Kolomensky, Yu. G., Lynch, G., Koch, H., Schroeder, T., Asgeirsson, D. J., Hearty, C., Mattison, T. S., McKenna, J. A., Khan, A., Blinov, V. E., Buzykaev, A. R., Druzhinin, V. P., Golubev, V. B., Kravchenko, E. A., Onuchin, A. P., Serednyakov, S. I., Skovpen, Yu. I., Solodov, E. P., Todyshev, K. Yu., Yushkov, A. N., Bondioli, M., Kirkby, D., Lankford, A. J., Mandelkern, M., Stoker, D. P., Atmacan, H., Gary, J. W., Liu, F., Long, O., Vitug, G. M., Campagnari, C., Hong, T. M., Kovalskyi, D., Richman, J. D., West, C. A., Eisner, A. M., Kroseberg, J., Lockman, W. S., Martinez, A. J., Schalk, T., Schumm, B. A., Seiden, A., Cheng, C. H., Doll, D. A., Echenard, B., Flood, K. T., Hitlin, D. G., Ongmongkolkul, P., Porter, F. C., Rakitin, A. Y., Andreassen, R., Dubrovin, M. S., Huard, Z., Meadows, B. T., Sokoloff, M. D., Sun, L., Bloom, P. C., Ford, W. T., Gaz, A., Nagel, M., Nauenberg, U., Smith, J. G., Wagner, S. R., Ayad, R., Toki, W. H., Spaan, B., Kobel, M. J., Schubert, K. R., Schwierz, R., Bernard, D., Verderi, M., Clark, P. J., Playfer, S., Bettoni, D., Bozzi, C., Calabrese, R., Cibinetto, G., Fioravanti, E., Garzia, I., Luppi, E., Munerato, M., Negrini, M., Piemontese, L., Santoro, V., Baldini-Ferroli, R., Calcaterra, A., de Sangro, R., Finocchiaro, G., Nicolaci, M., Patteri, P., Peruzzi, I. M., Piccolo, M., Rama, M., Zallo, A., Contri, R., Guido, E., Vetere, M. Lo, Monge, M. R., Passaggio, S., Patrignani, C., Robutti, E., Bhuyan, B., Prasad, V., Lee, C. L., Morii, M., Edwards, A. J., Adametz, A., Marks, J., Uwer, U., Bernlochner, F. U., Ebert, M., Lacker, H. M., Lueck, T., Dauncey, P. D., Tibbetts, M., Behera, P. K., Mallik, U., Chen, C., Cochran, J., Meyer, W. T., Prell, S., Rosenberg, E. I., Rubin, A. E., Gritsan, A. V., Guo, Z. J., Arnaud, N., Davier, M., Grosdidier, G., Diberder, F. Le, Lutz, A. M., Malaescu, B., Roudeau, P., Schune, M. H., Stocchi, A., Wormser, G., Lange, D. J., Wright, D. M., Bingham, I., Chavez, C. A., Coleman, J. P., Fry, J. R., Gabathuler, E., Hutchcroft, D. E., Payne, D. J., Touramanis, C., Bevan, A. J., Di Lodovico, F., Sacco, R., Sigamani, M., Cowan, G., Davis, C. L., Denig, A. G., Fritsch, M., Gradl, W., Hafner, A., Prencipe, E., Alwyn, K. E., Bailey, D., Barlow, R. J., Jackson, G., Lafferty, G. D., Behn, E., Cenci, R., Hamilton, B., Jawahery, A., Roberts, D. A., Simi, G., Dallapiccola, C., Cowan, R., Dujmic, D., Sciolla, G., Lindemann, D., Patel, P. M., Robertson, S. H., Schram, M., Biassoni, P., Lazzaro, A., Lombardo, V., Neri, N., Palombo, F., Stracka, S., Cremaldi, L., Godang, R., Kroeger, R., Sonnek, P., Summers, D. J., Nguyen, X., Taras, P., De Nardo, G., Monorchio, D., Onorato, G., Sciacca, C., Raven, G., Snoek, H. L., Jessop, C. P., Knoepfel, K. J., LoSecco, J. M., Wang, W. F., Honscheid, K., Kass, R., Brau, J., Frey, R., Sinev, N. B., Strom, D., Torrence, E., Feltresi, E., Gagliardi, N., Margoni, M., Morandin, M., Posocco, M., Rotondo, M., Simonetto, F., Stroili, R., Akar, S., Ben-Haim, E., Bomben, M., Bonneaud, G. R., Briand, H., Calderini, G., Chauveau, J., Hamon, O., Leruste, Ph., Marchiori, G., Ocariz, J., Sitt, S., Biasini, M., Manoni, E., Pacetti, S., Rossi, A., Angelini, C., Batignani, G., Bettarini, S., Carpinelli, M., Casarosa, G., Cervelli, A., Forti, F., Giorgi, M. A., Lusiani, A., Oberhof, B., Paoloni, E., Perez, A., Rizzo, G., Walsh, J. J., Pegna, D. Lopes, Lu, C., Olsen, J., Smith, A. J. S., Telnov, A. V., Anulli, F., Cavoto, G., Faccini, R., Ferrarotto, F., Ferroni, F., Gaspero, M., Gioi, L. Li, Mazzoni, M. A., Piredda, G., Bünger, C., Grünberg, O., Hartmann, T., Leddig, T., Schröder, H., Waldi, R., Adye, T., Olaiya, E. O., Wilson, F. F., Emery, S., de Monchenault, G. Hamel, Vasseur, G., Y\`, Ch., Aston, D., Bard, D. J., Bartoldus, R., Cartaro, C., Convery, M. R., Dorfan, J., Dubois-Felsmann, G. P., Dunwoodie, W., Field, R. C., Sevilla, M. Franco, Fulsom, B. G., Gabareen, A. M., Graham, M. T., Grenier, P., Hast, C., Innes, W. R., Kelsey, M. H., Kim, H., Kim, P., Kocian, M. L., Leith, D. W. G. S., Lewis, P., Li, S., Lindquist, B., Luitz, S., Luth, V., Lynch, H. L., MacFarlane, D. B., Muller, D. R., Neal, H., Nelson, S., Ofte, I., Perl, M., Pulliam, T., Ratcliff, B. N., Roodman, A., Salnikov, A. A., Schindler, R. H., Snyder, A., Su, D., Sullivan, M. K., Va'vra, J., Wagner, A. P., Weaver, M., Wisniewski, W. J., Wittgen, M., Wright, D. H., Wulsin, H. W., Yarritu, A. K., Young, C. C., Ziegler, V., Park, W., Purohit, M. V., White, R. M., Wilson, J. R., Randle-Conde, A., Sekula, S. J., Bellis, M., Benitez, J. F., Burchat, P. R., Miyashita, T. S., Alam, M. S., Ernst, J. A., Gorodeisky, R., Guttman, N., Peimer, D. R., Soffer, A., Lund, P., Spanier, S. M., Eckmann, R., Ritchie, J. L., Ruland, A. M., Schilling, C. J., Schwitters, R. F., Wray, B. C., Izen, J. M., Lou, X. C., Bianchi, F., Gamba, D., Lanceri, L., Vitale, L., Martinez-Vidal, F., Oyanguren, A., Ahmed, H., Albert, J., Banerjee, Sw., Choi, H. H. F., King, G. J., Kowalewski, R., Lewczuk, M. J., Nugent, I. M., Roney, J. M., Sobie, R. J., Tasneem, N., Gershon, T. J., Harrison, P. F., Latham, T. E., Puccio, E. M. T., Band, H. R., Dasu, S., Pan, Y., Prepost, R., and Wu, S. L.

Subjects
High Energy Physics - Experiment
Abstract

We study the process e+e- -> pi+pi-pi+pi-gamma, with a photon emitted from the initial-state electron or positron, using 454.3 fb^-1 of data collected with the BABAR detector at SLAC, corresponding to approximately 260,000 signal events. We use these data to extract the non-radiative sigma(e+e- ->pi+pi-pi+pi-) cross section in the energy range from 0.6 to 4.5 Gev. The total uncertainty of the cross section measurement in the peak region is less than 3%, higher in precision than the corresponding results obtained from energy scan data.

Published
2012
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46. A Measurement of the Semileptonic Branching Fraction of the B_s Meson

Author

The BaBar Collaboration, Lees, J. P., Poireau, V., Tisserand, V., Tico, J. Garra, Grauges, E., Martinelli, M., Milanes, D. A., Palano, A., Pappagallo, M., Eigen, G., Stugu, B., Brown, D. N., Kerth, L. T., Kolomensky, Yu. G., Lynch, G., Koch, H., Schroeder, T., Asgeirsson, D. J., Hearty, C., Mattison, T. S., McKenna, J. A., Khan, A., Blinov, V. E., Buzykaev, A. R., Druzhinin, V. P., Golubev, V. B., Kravchenko, E. A., Onuchin, A. P., Serednyakov, S. I., Skovpen, Yu. I., Solodov, E. P., Todyshev, K. Yu., Yushkov, A. N., Bondioli, M., Kirkby, D., Lankford, A. J., Mandelkern, M., Stoker, D. P., Atmacan, H., Gary, J. W., Liu, F., Long, O., Vitug, G. M., Campagnari, C., Hong, T. M., Kovalskyi, D., Richman, J. D., West, C. A., Eisner, A. M., Kroseberg, J., Lockman, W. S., Martinez, A. J., Schalk, T., Schumm, B. A., Seiden, A., Cheng, C. H., Doll, D. A., Echenard, B., Flood, K. T., Hitlin, D. G., Ongmongkolkul, P., Porter, F. C., Rakitin, A. Y., Andreassen, R., Dubrovin, M. S., Huard, Z., Meadows, B. T., Sokoloff, M. D., Sun, L., Bloom, P. C., Ford, W. T., Gaz, A., Nagel, M., Nauenberg, U., Smith, J. G., Wagner, S. R., Ayad, R., Toki, W. H., Spaan, B., Kobel, M. J., Schubert, K. R., Schwierz, R., Bernard, D., Verderi, M., Clark, P. J., Playfer, S., Bettoni, D., Bozzi, C., Calabrese, R., Cibinetto, G., Fioravanti, E., Garzia, I., Luppi, E., Munerato, M., Negrini, M., Piemontese, L., Santoro, V., Baldini-Ferroli, R., Calcaterra, A., de Sangro, R., Finocchiaro, G., Nicolaci, M., Patteri, P., Peruzzi, I. M., Piccolo, M., Rama, M., Zallo, A., Contri, R., Guido, E., Vetere, M. Lo, Monge, M. R., Passaggio, S., Patrignani, C., Robutti, E., Bhuyan, B., Prasad, V., Lee, C. L., Morii, M., Edwards, A. J., Adametz, A., Marks, J., Uwer, U., Bernlochner, F. U., Lacker, H. M., Lueck, T., Dauncey, P. D., Tibbetts, M., Behera, P. K., Mallik, U., Chen, C., Cochran, J., Meyer, W. T., Prell, S., Rosenberg, E. I., Rubin, A. E., Gritsan, A. V., Guo, Z. J., Arnaud, N., Davier, M., Derkach, D., Grosdidier, G., Diberder, F. Le, Lutz, A. M., Malaescu, B., Roudeau, P., Schune, M. H., Stocchi, A., Wormser, G., Lange, D. J., Wright, D. M., Bingham, I., Chavez, C. A., Coleman, J. P., Fry, J. R., Gabathuler, E., Hutchcroft, D. E., Payne, D. J., Touramanis, C., Bevan, A. J., Di Lodovico, F., Sacco, R., Sigamani, M., Cowan, G., Davis, C. L., Denig, A. G., Fritsch, M., Gradl, W., Hafner, A., Prencipe, E., Alwyn, K. E., Bailey, D., Barlow, R. J., Jackson, G., Lafferty, G. D., Behn, E., Cenci, R., Hamilton, P. M., Jawahery, A., Roberts, D. A., Simi, G., Dallapiccola, C., Cowan, R., Dujmic, D., Sciolla, G., Lindemann, D., Patel, P. M., Robertson, S. H., Schram, M., Biassoni, P., Neri, N., Palombo, F., Stracka, S., Cremaldi, L., Godang, R., Kroeger, R., Sonnek, P., Summers, D. J., Nguyen, X., Simard, M., Taras, P., De Nardo, G., Monorchio, D., Onorato, G., Sciacca, C., Raven, G., Snoek, H. L., Jessop, C. P., Knoepfel, K. J., LoSecco, J. M., Wang, W. F., Honscheid, K., Kass, R., Brau, J., Frey, R., Sinev, N. B., Strom, D., Torrence, E., Feltresi, E., Gagliardi, N., Margoni, M., Morandin, M., Posocco, M., Rotondo, M., Simonetto, F., Stroili, R., Akar, S., Ben-Haim, E., Bomben, M., Bonneaud, G. R., Briand, H., Calderini, G., Chauveau, J., Hamon, O., Leruste, Ph., Marchiori, G., Ocariz, J., Sitt, S., Biasini, M., Manoni, E., Pacetti, S., Rossi, A., Angelini, C., Batignani, G., Bettarini, S., Carpinelli, M., Casarosa, G., Cervelli, A., Forti, F., Giorgi, M. A., Lusiani, A., Oberhof, B., Paoloni, E., Perez, A., Rizzo, G., Walsh, J. J., Pegna, D. Lopes, Lu, C., Olsen, J., Smith, A. J. S., Telnov, A. V., Anulli, F., Cavoto, G., Faccini, R., Ferrarotto, F., Ferroni, F., Gaspero, M., Gioi, L. Li, Mazzoni, M. A., Piredda, G., Renga, F., Bünger, C., Grünberg, O., Hartmann, T., Leddig, T., Schröder, H., Waldi, R., Adye, T., Olaiya, E. O., Wilson, F. F., Emery, S., de Monchenault, G. Hamel, Vasseur, G., Y\`, Ch., Aston, D., Bard, D. J., Bartoldus, R., Cartaro, C., Convery, M. R., Dorfan, J., Dubois-Felsmann, G. P., Dunwoodie, W., Ebert, M., Field, R. C., Sevilla, M. Franco, Fulsom, B. G., Gabareen, A. M., Graham, M. T., Grenier, P., Hast, C., Innes, W. R., Kelsey, M. H., Kim, H., Kim, P., Kocian, M. L., Leith, D. W. G. S., Lewis, P., Lindquist, B., Luitz, S., Luth, V., Lynch, H. L., MacFarlane, D. B., Muller, D. R., Neal, H., Nelson, S., Perl, M., Pulliam, T., Ratcliff, B. N., Roodman, A., Salnikov, A. A., Schindler, R. H., Snyder, A., Su, D., Sullivan, M. K., Va'vra, J., Wagner, A. P., Weaver, M., Wisniewski, W. J., Wittgen, M., Wright, D. H., Wulsin, H. W., Yarritu, A. K., Young, C. C., Ziegler, V., Park, W., Purohit, M. V., White, R. M., Wilson, J. R., Randle-Conde, A., Sekula, S. J., Bellis, M., Benitez, J. F., Burchat, P. R., Miyashita, T. S., Alam, M. S., Ernst, J. A., Gorodeisky, R., Guttman, N., Peimer, D. R., Soffer, A., Lund, P., Spanier, S. M., Eckmann, R., Ritchie, J. L., Ruland, A. M., Schilling, C. J., Schwitters, R. F., Wray, B. C., Izen, J. M., Lou, X. C., Bianchi, F., Gamba, D., Lanceri, L., Vitale, L., Martinez-Vidal, F., Oyanguren, A., Ahmed, H., Albert, J., Banerjee, Sw., Choi, H. H. F., King, G. J., Kowalewski, R., Lewczuk, M. J., Nugent, I. M., Roney, J. M., Sobie, R. J., Tasneem, N., Gershon, T. J., Harrison, P. F., Latham, T. E., Puccio, E. M. T., Band, H. R., Dasu, S., Pan, Y., Prepost, R., and Wu, S. L.

Subjects
High Energy Physics - Experiment
Abstract

We report a measurement of the inclusive semileptonic branching fraction of the B_s meson using data collected with the BaBar detector in the center-of-mass (CM) energy region above the Upsilon(4S) resonance. We use the inclusive yield of phi mesons and the phi yield in association with a high-momentum lepton to perform a simultaneous measurement of the semileptonic branching fraction and the production rate of B_s mesons relative to all B mesons as a function of CM energy. The inclusive semileptonic branching fraction of the B_s meson is determined to be B(B_s to l nu X)=9.5 (+2.5/-2.0)(stat)(+1.1/-1.9)(syst)%, where l indicates the average of e and mu., Comment: 8 pages, 7 eps figures

Published
2011
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47. Search for hadronic decays of a light Higgs boson in the radiative decay Upsilon --> gamma A0

Author

The BABAR Collaboration, Lees, J. P., Poireau, V., Tisserand, V., Tico, J. Garra, Grauges, E., Martinelli, M., Milanes, D. A., Palano, A., Pappagallo, M., Eigen, G., Stugu, B., Brown, D. N., Kerth, L. T., Kolomensky, Yu. G., Lynch, G., Koch, H., Schroeder, T., Asgeirsson, D. J., Hearty, C., Mattison, T. S., McKenna, J. A., So, R. Y., Khan, A., Blinov, V. E., Buzykaev, A. R., Druzhinin, V. P., Golubev, V. B., Kravchenko, E. A., Onuchin, A. P., Serednyakov, S. I., Skovpen, Yu. I., Solodov, E. P., Todyshev, K. Yu., Yushkov, A. N., Bondioli, M., Kirkby, D., Lankford, A. J., Mandelkern, M., Stoker, D. P., Atmacan, H., Gary, J. W., Liu, F., Long, O., Vitug, G. M., Campagnari, C., Hong, T. M., Kovalskyi, D., Richman, J. D., West, C. A., Eisner, A. M., Kroseberg, J., Lockman, W. S., Martinez, A. J., Schalk, T., Schumm, B. A., Seiden, A., Cheng, C. H., Doll, D. A., Echenard, B., Flood, K. T., Hitlin, D. G., Ongmongkolkul, P., Porter, F. C., Rakitin, A. Y., Andreassen, R., Dubrovin, M. S., Huard, Z., Meadows, B. T., Sokoloff, M. D., Sun, L., Bloom, P. C., Ford, W. T., Gaz, A., Nagel, M., Nauenberg, U., Smith, J. G., Wagner, S. R., Ayad, R., Toki, W. H., Spaan, B., Kobel, M. J., Schubert, K. R., Schwierz, R., Bernard, D., Verderi, M., Clark, P. J., Playfer, S., Bettoni, D., Bozzi, C., Calabrese, R., Cibinetto, G., Fioravanti, E., Garzia, I., Luppi, E., Munerato, M., Negrini, M., Piemontese, L., Santoro, V., Baldini-Ferroli, R., Calcaterra, A., de Sangro, R., Finocchiaro, G., Nicolaci, M., Patteri, P., Peruzzi, I. M., Piccolo, M., Rama, M., Zallo, A., Contri, R., Guido, E., Vetere, M. Lo, Monge, M. R., Passaggio, S., Patrignani, C., Robutti, E., Bhuyan, B., Prasad, V., Lee, C. L., Morii, M., Edwards, A. J., Adametz, A., Marks, J., Uwer, U., Bernlochner, F. U., Ebert, M., Lacker, H. M., Lueck, T., Dauncey, P. D., Tibbetts, M., Behera, P. K., Mallik, U., Chen, C., Cochran, J., Meyer, W. T., Prell, S., Rosenberg, E. I., Rubin, A. E., Gritsan, A. V., Guo, Z. J., Arnaud, N., Davier, M., Grosdidier, G., Diberder, F. Le, Lutz, A. M., Malaescu, B., Roudeau, P., Schune, M. H., Stocchi, A., Wormser, G., Lange, D. J., Wright, D. M., Bingham, I., Chavez, C. A., Coleman, J. P., Fry, J. R., Gabathuler, E., Hutchcroft, D. E., Payne, D. J., Touramanis, C., Bevan, A. J., Di Lodovico, F., Sacco, R., Sigamani, M., Cowan, G., Davis, C. L., Denig, A. G., Fritsch, M., Gradl, W., Hafner, A., Prencipe, E., Alwyn, K. E., Bailey, D., Barlow, R. J., Jackson, G., Lafferty, G. D., Behn, E., Cenci, R., Hamilton, B., Jawahery, A., Roberts, D. A., Simi, G., Dallapiccola, C., Cowan, R., Dujmic, D., Sciolla, G., Lindemann, D., Patel, P. M., Robertson, S. H., Schram, M., Biassoni, P., Lazzaro, A., Lombardo, V., Neri, N., Palombo, F., Stracka, S., Cremaldi, L., Godang, R., Kroeger, R., Sonnek, P., Summers, D. J., Nguyen, X., Taras, P., De Nardo, G., Monorchio, D., Onorato, G., Sciacca, C., Raven, G., Snoek, H. L., Jessop, C. P., Knoepfel, K. J., LoSecco, J. M., Wang, W. F., Honscheid, K., Kass, R., Brau, J., Frey, R., Sinev, N. B., Strom, D., Torrence, E., Feltresi, E., Gagliardi, N., Margoni, M., Morandin, M., Posocco, M., Rotondo, M., Simonetto, F., Stroili, R., Akar, S., Ben-Haim, E., Bomben, M., Bonneaud, G. R., Briand, H., Calderini, G., Chauveau, J., Hamon, O., Leruste, Ph., Marchiori, G., Ocariz, J., Sitt, S., Biasini, M., Manoni, E., Pacetti, S., Rossi, A., Angelini, C., Batignani, G., Bettarini, S., Carpinelli, M., Casarosa, G., Cervelli, A., Forti, F., Giorgi, M. A., Lusiani, A., Oberhof, B., Paoloni, E., Perez, A., Rizzo, G., Walsh, J. J., Pegna, D. Lopes, Lu, C., Olsen, J., Smith, A. J. S., Telnov, A. V., Anulli, F., Cavoto, G., Faccini, R., Ferrarotto, F., Ferroni, F., Gaspero, M., Gioi, L. Li, Mazzoni, M. A., Piredda, G., Bünger, C., Grünberg, O., Hartmann, T., Leddig, T., Schröder, H., Waldi, R., Adye, T., Olaiya, E. O., Wilson, F. F., Emery, S., de Monchenault, G. Hamel, Vasseur, G., Yeche, Ch., Aston, D., Bard, D. J., Bartoldus, R., Cartaro, C., Convery, M. R., Dorfan, J., Dubois-Felsmann, G. P., Dunwoodie, W., Field, R. C., Sevilla, M. Franco, Fulsom, B. G., Gabareen, A. M., Graham, M. T., Grenier, P., Hast, C., Innes, W. R., Kelsey, M. H., Kim, H., Kim, P., Kocian, M. L., Leith, D. W. G. S., Lewis, P., Li, S., Lindquist, B., Luitz, S., Luth, V., Lynch, H. L., MacFarlane, D. B., Muller, D. R., Neal, H., Nelson, S., Ofte, I., Perl, M., Pulliam, T., Ratcliff, B. N., Roodman, A., Salnikov, A. A., Schindler, R. H., Snyder, A., Su, D., Sullivan, M. K., Va'vra, J., Wagner, A. P., Weaver, M., Wisniewski, W. J., Wittgen, M., Wright, D. H., Wulsin, H. W., Yarritu, A. K., Young, C. C., Ziegler, V., Park, W., Purohit, M. V., White, R. M., Wilson, J. R., Randle-Conde, A., Sekula, S. J., Bellis, M., Benitez, J. F., Burchat, P. R., Miyashita, T. S., Alam, M. S., Ernst, J. A., Gorodeisky, R., Guttman, N., Peimer, D. R., Soffer, A., Lund, P., Spanier, S. M., Eckmann, R., Ritchie, J. L., Ruland, A. M., Schilling, C. J., Schwitters, R. F., Wray, B. C., Izen, J. M., Lou, X. C., Bianchi, F., Gamba, D., Lanceri, L., Vitale, L., Martinez-Vidal, F., Oyanguren, A., Ahmed, H., Albert, J., Banerjee, Sw., Choi, H. H. F., King, G. J., Kowalewski, R., Lewczuk, M. J., Nugent, I. M., Roney, J. M., Sobie, R. J., Tasneem, N., Gershon, T. J., Harrison, P. F., Latham, T. E., Puccio, E. M. T., Band, H. R., Dasu, S., Pan, Y., Prepost, R., and Wu, S. L.

Subjects
High Energy Physics - Experiment
Abstract

We search for hadronic decays of a light Higgs boson (A0) produced in radiative decays of an Upsilon(2S) or Upsilon(3S) meson, Upsilon --> gamma A0. The data have been recorded by the BABAR experiment at the Upsilon(3S) and Upsilon(2S) center of mass energies, and include (121.3 \pm 1.2) x 10^6 Upsilon(3S) and (98.3 \pm 0.9) x 10^6 Upsilon(2S) mesons. No significant signal is observed. We set 90% confidence level upper limits on the product branching fractions B(Upsilon(nS)-->gamma A0) x B(A0-->hadrons) (n=2 or 3) that range from 1 x 10^{-6} for an A0 mass of 0.3 GeV/c^2 to 8 x 10^{-5} at 7 GeV/c^2., Comment: 7 pages, 5 postscript figures, submitted to Physical Review Letters

Published
2011
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48. Observation of the baryonic B decay B0bar --> Lambda_c^+ anti-Lambda K-

Author

The BABAR Collaboration, Lees, J. P., Poireau, V., Tisserand, V., Tico, J. Garra, Grauges, E., Martinelli, M., Milanes, D. A., Palano, A., Pappagallo, M., Eigen, G., Stugu, B., Sun, L., Brown, D. N., Kerth, L. T., Kolomensky, Yu. G., Lynch, G., Koch, H., Schroeder, T., Asgeirsson, D. J., Hearty, C., Mattison, T. S., McKenna, J. A., Khan, A., Blinov, V. E., Buzykaev, A. R., Druzhinin, V. P., Golubev, V. B., Kravchenko, E. A., Onuchin, A. P., Serednyakov, S. I., Skovpen, Yu. I., Solodov, E. P., Todyshev, K. Yu., Yushkov, A. N., Bondioli, M., Kirkby, D., Lankford, A. J., Mandelkern, M., Stoker, D. P., Atmacan, H., Gary, J. W., Liu, F., Long, O., Vitug, G. M., Campagnari, C., Hong, T. M., Kovalskyi, D., Richman, J. D., West, C. A., Eisner, A. M., Kroseberg, J., Lockman, W. S., Martinez, A. J., Schalk, T., Schumm, B. A., Seiden, A., Cheng, C. H., Doll, D. A., Echenard, B., Flood, K. T., Hitlin, D. G., Ongmongkolkul, P., Porter, F. C., Rakitin, A. Y., Andreassen, R., Dubrovin, M. S., Huard, Z., Meadows, B. T., Sokoloff, M. D., Bloom, P. C., Ford, W. T., Gaz, A., Nagel, M., Nauenberg, U., Smith, J. G., Wagner, S. R., Ayad, R., Toki, W. H., Spaan, B., Kobel, M. J., Schubert, K. R., Schwierz, R., Bernard, D., Verderi, M., Clark, P. J., Playfer, S., Bettoni, D., Bozzi, C., Calabrese, R., Cibinetto, G., Fioravanti, E., Garzia, I., Luppi, E., Munerato, M., Negrini, M., Piemontese, L., Baldini-Ferroli, R., Calcaterra, A., de Sangro, R., Finocchiaro, G., Nicolaci, M., Patteri, P., Peruzzi, I. M., Piccolo, M., Rama, M., Zallo, A., Contri, R., Guido, E., Vetere, M. Lo, Monge, M. R., Passaggio, S., Patrignani, C., Robutti, E., Bhuyan, B., Prasad, V., Lee, C. L., Morii, M., Edwards, A. J., Adametz, A., Marks, J., Uwer, U., Bernlochner, F. U., Ebert, M., Lacker, H. M., Lueck, T., Dauncey, P. D., Tibbetts, M., Behera, P. K., Mallik, U., Chen, C., Cochran, J., Meyer, W. T., Prell, S., Rosenberg, E. I., Rubin, A. E., Gritsan, A. V., Guo, Z. J., Arnaud, N., Davier, M., Grosdidier, G., Diberder, F. Le, Lutz, A. M., Malaescu, B., Roudeau, P., Schune, M. H., Stocchi, A., Wormser, G., Lange, D. J., Wright, D. M., Bingham, I., Chavez, C. A., Coleman, J. P., Fry, J. R., Gabathuler, E., Hutchcroft, D. E., Payne, D. J., Touramanis, C., Bevan, A. J., Di Lodovico, F., Sacco, R., Sigamani, M., Cowan, G., Paramesvaran, S., Davis, C. L., Denig, A. G., Fritsch, M., Gradl, W., Hafner, A., Prencipe, E., Alwyn, K. E., Bailey, D., Barlow, R. J., Jackson, G., Lafferty, G. D., Cenci, R., Hamilton, B., Jawahery, A., Roberts, D. A., Simi, G., Dallapiccola, C., Cowan, R., Dujmic, D., Sciolla, G., Lindemann, D., Patel, P. M., Robertson, S. H., Schram, M., Biassoni, P., Lazzaro, A., Lombardo, V., Neri, N., Palombo, F., Stracka, S., Cremaldi, L., Godang, R., Kroeger, R., Sonnek, P., Summers, D. J., Nguyen, X., Taras, P., De Nardo, G., Monorchio, D., Onorato, G., Sciacca, C., Raven, G., Snoek, H. L., Jessop, C. P., Knoepfel, K. J., LoSecco, J. M., Wang, W. F., Honscheid, K., Kass, R., Brau, J., Frey, R., Sinev, N. B., Strom, D., Torrence, E., Feltresi, E., Gagliardi, N., Margoni, M., Morandin, M., Posocco, M., Rotondo, M., Simonetto, F., Stroili, R., Ben-Haim, E., Bomben, M., Bonneaud, G. R., Briand, H., Calderini, G., Chauveau, J., Hamon, O., Leruste, Ph., Marchiori, G., Ocariz, J., Sitt, S., Biasini, M., Manoni, E., Pacetti, S., Rossi, A., Angelini, C., Batignani, G., Bettarini, S., Carpinelli, M., Casarosa, G., Cervelli, A., Forti, F., Giorgi, M. A., Lusiani, A., Oberhof, B., Paoloni, E., Perez, A., Rizzo, G., Walsh, J. J., Pegna, D. Lopes, Lu, C., Olsen, J., Smith, A. J. S., Telnov, A. V., Anulli, F., Cavoto, G., Faccini, R., Ferrarotto, F., Ferroni, F., Gaspero, M., Gioi, L. Li, Mazzoni, M. A., Piredda, G., Bünger, C., Grünberg, O., Hartmann, T., Leddig, T., Schröder, H., Waldi, R., Adye, T., Olaiya, E. O., Wilson, F. F., Emery, S., de Monchenault, G. Hamel, Vasseur, G., Yèche, Ch., Aston, D., Bard, D. J., Bartoldus, R., Cartaro, C., Convery, M. R., Dorfan, J., Dubois-Felsmann, G. P., Dunwoodie, W., Field, R. C., Sevilla, M. Franco, Fulsom, B. G., Gabareen, A. M., Graham, M. T., Grenier, P., Hast, C., Innes, W. R., Kelsey, M. H., Kim, H., Kim, P., Kocian, M. L., Leith, D. W. G. S., Lewis, P., Li, S., Lindquist, B., Luitz, S., Luth, V., Lynch, H. L., MacFarlane, D. B., Muller, D. R., Neal, H., Nelson, S., Ofte, I., Perl, M., Pulliam, T., Ratcliff, B. N., Roodman, A., Salnikov, A. A., Santoro, V., Schindler, R. H., Snyder, A., Su, D., Sullivan, M. K., Va'vra, J., Wagner, A. P., Weaver, M., Wisniewski, W. J., Wittgen, M., Wright, D. H., Wulsin, H. W., Yarritu, A. K., Young, C. C., Ziegler, V., Park, W., Purohit, M. V., White, R. M., Wilson, J. R., Randle-Conde, A., Sekula, S. J., Bellis, M., Benitez, J. F., Burchat, P. R., Miyashita, T. S., Alam, M. S., Ernst, J. A., Gorodeisky, R., Guttman, N., Peimer, D. R., Soffer, A., Lund, P., Spanier, S. M., Eckmann, R., Ritchie, J. L., Ruland, A. M., Schilling, C. J., Schwitters, R. F., Wray, B. C., Izen, J. M., Lou, X. C., Bianchi, F., Gamba, D., Lanceri, L., Vitale, L., Martinez-Vidal, F., Oyanguren, A., Ahmed, H., Albert, J., Banerjee, Sw., Choi, H. H. F., King, G. J., Kowalewski, R., Lewczuk, M. J., Lindsay, C., Nugent, I. M., Roney, J. M., Sobie, R. J., Gershon, T. J., Harrison, P. F., Latham, T. E., Puccio, E. M. T., Band, H. R., Dasu, S., Pan, Y., Prepost, R., Vuosalo, C. O., and Wu, S. L.

Subjects
High Energy Physics - Experiment
Abstract

We report the observation of the baryonic B decay B0bar --> Lambda_c^+ anti-Lambda K- with a significance larger than 7 standard deviations based on 471x10^6$ BBbar pairs collected with the BABAR detector at the PEP-II storage ring at SLAC. We measure the branching fraction for the decay B0bar --> Lambda_c^+ anti-Lambda K- to be (3.8 \pm 0.8_{stat} \pm 0.2_{sys} \pm 1.0_{Lambda_c^+})x10^{-5}. The uncertainties are statistical, systematic, and due to the uncertainty in the Lambda_c^+ branching fraction. We find that the Lambda_c^+ K^- invariant mass distribution shows an enhancement above 3.5 GeV/c^2., Comment: 7 pages, 7 figures, submitted to Phys. Rev. D (Rapid Communications)

Published
2011
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49. Study of radiative bottomonium transitions using converted photons

Author

The BABAR Collaboration, Lees, J. P., Poireau, V., Prencipe, E., Tisserand, V., GarraTico, J., Grauges, E., Martinelli, M., Milanes, D. A., Palano, A., Pappagallo, M., Eigen, G., Stugu, B., Sun, L., Brown, D. N., Kerth, L. T., Kolomensky, Yu. G., Lynch, G., Koch, H., Schroeder, T., Asgeirsson, D. J., Hearty, C., Mattison, T. S., McKenna, J. A., Khan, A., Blinov, V. E., Buzykaev, A. R., Druzhinin, V. P., Golubev, V. B., Kravchenko, E. A., Onuchin, A. P., Serednyakov, S. I., Skovpen, Yu. I., Solodov, E. P., Todyshev, K. Yu., Yushkov, A. N., Bondioli, M., Curry, S., Kirkby, D., Lankford, A. J., Mandelkern, M., Stoker, D. P., Atmacan, H., Gary, J. W., Liu, F., Long, O., Vitug, G. M., Campagnari, C., Hong, T. M., Kovalskyi, D., Richman, J. D., West, C. A., Eisner, A. M., Kroseberg, J., Lockman, W. S., Martinez, A. J., Schalk, T., Schumm, B. A., Seiden, A., Cheng, C. H., Doll, D. A., Echenard, B., Flood, K. T., Hitlin, D. G., Ongmongkolkul, P., Porter, F. C., Rakitin, A. Y., Andreassen, R., Dubrovin, M. S., Meadows, B. T., Sokoloff, M. D., Bloom, P. C., Ford, W. T., Gaz, A., Nagel, M., Nauenberg, U., Smith, J. G., Wagner, S. R., Ayad, R., Toki, W. H., Spaan, B., Kobel, M. J., Schubert, K. R., Schwierz, R., Bernard, D., Verderi, M., Clark, P. J., Playfer, S., Watson, J. E., Bettoni, D., Bozzi, C., Calabrese, R., Cibinetto, G., Fioravanti, E., Garzia, I., Luppi, E., Munerato, M., Negrini, M., Piemontese, L., Baldini-Ferroli, R., Calcaterra, A., deSangro, R., Finocchiaro, G., Nicolaci, M., Pacetti, S., Patteri, P., Peruzzi, I. M., Piccolo, M., Rama, M., Zallo, A., Contri, R., Guido, E., LoVetere, M., Monge, M. R., Passaggio, S., Patrignani, C., Robutti, E., Bhuyan, B., Prasad, V., Lee, C. L., Morii, M., Edwards, A. J., Adametz, A., Marks, J., Uwer, U., Bernlochner, F. U., Ebert, M., Lacker, H. M., Lueck, T., Dauncey, P. D., Tibbetts, M., Behera, P. K., Mallik, U., Chen, C., Cochran, J., Crawley, H. B., Meyer, W. T., Prell, S., Rosenberg, E. I., Rubin, A. E., Gritsan, A. V., Guo, Z. J., Arnaud, N., Davier, M., Derkach, D., Grosdidier, G., LeDiberder, F., Lutz, A. M., Malaescu, B., Roudeau, P., Schune, M. H., Stocchi, A., Wormser, G., Lange, D. J., Wright, D. M., Bingham, I., Chavez, C. A., Coleman, J. P., Fry, J. R., Gabathuler, E., Hutchcroft, D. E., Payne, D. J., Touramanis, C., Bevan, A. J., DiLodovico, F., Sacco, R., Sigamani, M., Cowan, G., Paramesvaran, S., Davis, C. L., Denig, A. G., Fritsch, M., Gradl, W., Hafner, A., Alwyn, K. E., Bailey, D., Barlow, R. J., Jackson, G., Lafferty, G. D., Cenci, R., Hamilton, B., Jawahery, A., Roberts, D. A., Simi, G., Dallapiccola, C., Salvati, E., Cowan, R., Dujmic, D., Sciolla, G., Lindemann, D., Patel, P. M., Robertson, S. H., Schram, M., Biassoni, P., Lazzaro, A., Lombardo, V., Palombo, F., Stracka, S., Cremaldi, L., Godang, R., Kroeger, R., Sonnek, P., Summers, D. J., Nguyen, X., Taras, P., De Nardo, G., Monorchio, D., Onorato, G., Sciacca, C., Raven, G., Snoek, H. L., Jessop, C. P., Knoepfel, K. J., LoSecco, J. M., Wang, W. F., Honscheid, K., Kass, R., Brau, J., Frey, R., Sinev, N. B., Strom, D., Torrence, E., Feltresi, E., Gagliardi, N., Margoni, M., Morandin, M., Posocco, M., Rotondo, M., Simonetto, F., Stroili, R., Ben-Haim, E., Bomben, M., Bonneaud, G. R., Briand, H., Calderini, G., Chauveau, J., Hamon, O., Leruste, Ph., Marchiori, G., Ocariz, J., Sitt, S., Biasini, M., Manoni, E., Rossi, A., Angelini, C., Batignani, G., Bettarini, S., Carpinelli, M., Casarosa, G., Cervelli, A., Forti, F., Giorgi, M. A., Lusiani, A., Neri, N., Oberhof, B., Paoloni, E., Perez, A., Rizzo, G., Walsh, J. J., LopesPegna, D., Lu, C., Olsen, J., Smith, A. J. S., Telnov, A. V., Anulli, F., Cavoto, G., Faccini, R., Ferrarotto, F., Ferroni, F., Gaspero, M., LiGioi, L., Mazzoni, M. A., Piredda, G., Bunger, C., Hartmann, T., Leddig, T., Schroder, H., Waldi, R., Adye, T., Olaiya, E. O., Wilson, F. F., Emery, S., de Monchenault, G. Hamel, Vasseur, G., Yeche, Ch., Aston, D., Bard, D. J., Bartoldus, R., Benitez, J. F., Cartaro, C., Convery, M. R., Dorfan, J., Dubois-Felsmann, G. P., Dunwoodie, W., Field, R. C., Sevilla, M. Franco, Fulsom, B. G., Gabareen, A. M., Graham, M. T., Grenier, P., Hast, C., Innes, W. R., Kelsey, M. H., Kim, H., Kim, P., Kocian, M. L., Leith, D. W. G. S., Lewis, P., Li, S., Lindquist, B., Luitz, S., Luth, V., Lynch, H. L., MacFarlane, D. B., Muller, D. R., Neal, H., Nelson, S., Ofte, I., Perl, M., Pulliam, T., Ratcliff, B. N., Roodman, A., Salnikov, A. A., Santoro, V., Schindler, R. H., Snyder, A., Su, D., Sullivan, M. K., Va'vra, J., Wagner, A. P., Weaver, M., Wisniewski, W. J., Wittgen, M., Wright, D. H., Wulsin, H. W., Yarritu, A. K., Young, C. C., Ziegler, V., Park, W., Purohit, M. V., White, R. M., Wilson, J. R., Randle-Conde, A., Sekula, S. J., Bellis, M., Burchat, P. R., Miyashita, T. S., Alam, M. S., Ernst, J. A., Gorodeisky, R., Guttman, N., Peimer, D. R., Soffer, A., Lund, P., Spanier, S. M., Eckmann, R., Ritchie, J. L., Ruland, A. M., Schilling, C. J., Schwitters, R. F., Wray, B. C., Izen, J. M., Lou, X. C., Bianchi, F., Gamba, D., Lanceri, L., Vitale, L., Lopez-March, N., Martinez-Vidal, F., Oyanguren, A., Ahmed, H., Albert, J., Banerjee, Sw., Choi, H. H. F., King, G. J., Kowalewski, R., Lewczuk, M. J., Lindsay, C., Nugent, I. M., Roney, J. M., Sobie, R. J., Gershon, T. J., Harrison, P. F., Latham, T. E., Puccio, E. M. T., Band, H. R., Dasu, S., Pan, Y., Prepost, R., Vuosalo, C. O., and Wu, S. L.

Subjects
High Energy Physics - Experiment
Abstract

We use 111+/-1 million Upsilon(3S) and 89+/-1 million Upsilon(2S) events recorded by the BaBar detector at the PEP-II B-factory at SLAC to perform a study of radiative transitions between bottomonium states using photons that have been converted to e+e- pairs by the detector material. We observe Upsilon(3S) -> gamma chi_b0,2(1P) decay, make precise measurements of the branching fractions for chi_b1,2(1P,2P) -> gamma Upsilon(1S) and chi_b1,2(2P) -> gamma Upsilon(2S) decays, and search for radiative decay to the eta_b(1S) and eta_b(2S) states., Comment: 19 pages, 8 figures, published by Phys. Rev. D

Published
2011
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50. Evidence for the h_b(1P) meson in the decay Upsilon(3S) --> pi0 h_b(1P)

Author

The BABAR Collaboration, Lees, J. P., Poireau, V., Prencipe, E., Tisserand, V., Tico, J. Garra, Grauges, E., Martinelli, M., Milanes, D. A., Palano, A., Pappagallo, M., Eigen, G., Stugu, B., Sun, L., Brown, D. N., Kerth, L. T., Kolomensky, Yu. G., Lynch, G., Osipenkov, I. L., Koch, H., Schroeder, T., Asgeirsson, D. J., Hearty, C., Mattison, T. S., McKenna, J. A., Khan, A., Blinov, V. E., Buzykaev, A. R., Druzhinin, V. P., Golubev, V. B., Kravchenko, E. A., Onuchin, A. P., Serednyakov, S. I., Skovpen, Yu. I., Solodov, E. P., Todyshev, K. Yu., Yushkov, A. N., Bondioli, M., Curry, S., Kirkby, D., Lankford, A. J., Mandelkern, M., Stoker, D. P., Atmacan, H., Gary, J. W., Liu, F., Long, O., Vitug, G. M., Campagnari, C., Hong, T. M., Kovalskyi, D., Richman, J. D., West, C. A., Eisner, A. M., Kroseberg, J., Lockman, W. S., Martinez, A. J., Schalk, T., Schumm, B. A., Seiden, A., Cheng, C. H., Doll, D. A., Echenard, B., Flood, K. T., Hitlin, D. G., Ongmongkolkul, P., Porter, F. C., Rakitin, A. Y., Andreassen, R., Dubrovin, M. S., Meadows, B. T., Sokoloff, M. D., Bloom, P. C., Ford, W. T., Gaz, A., Nagel, M., Nauenberg, U., Smith, J. G., Wagner, S. R., Ayad, R., Toki, W. H., Jasper, H., Petzold, A., Spaan, B., Kobel, M. J., Schubert, K. R., Schwierz, R., Bernard, D., Verderi, M., Clark, P. J., Playfer, S., Watson, J. E., Bettoni, D., Bozzi, C., Calabrese, R., Cibinetto, G., Fioravanti, E., Garzia, I., Luppi, E., Munerato, M., Negrini, M., Piemontese, L., Baldini-Ferroli, R., Calcaterra, A., de Sangro, R., Finocchiaro, G., Nicolaci, M., Pacetti, S., Patteri, P., Peruzzi, I. M., Piccolo, M., Rama, M., Zallo, A., Contri, R., Guido, E., Vetere, M. Lo, Monge, M. R., Passaggio, S., Patrignani, C., Robutti, E., Bhuyan, B., Prasad, V., Lee, C. L., Morii, M., Edwards, A. J., Adametz, A., Marks, J., Uwer, U., Bernlochner, F. U., Ebert, M., Lacker, H. M., Lueck, T., Dauncey, P. D., Tibbetts, M., Behera, P. K., Mallik, U., Chen, C., Cochran, J., Crawley, H. B., Meyer, W. T., Prell, S., Rosenberg, E. I., Rubin, A. E., Gritsan, A. V., Guo, Z. J., Arnaud, N., Davier, M., Derkach, D., da Costa, J. Firmino, Grosdidier, G., Diberder, F. Le, Lutz, A. M., Malaescu, B., Perez, A., Roudeau, P., Schune, M. H., Stocchi, A., Wang, L., Wormser, G., Lange, D. J., Wright, D. M., Bingham, I., Chavez, C. A., Coleman, J. P., Fry, J. R., Gabathuler, E., Hutchcroft, D. E., Payne, D. J., Touramanis, C., Bevan, A. J., Di Lodovico, F., Sacco, R., Sigamani, M., Cowan, G., Paramesvaran, S., Wren, A. C., Davis, C. L., Denig, A. G., Fritsch, M., Gradl, W., Hafner, A., Alwyn, K. E., Bailey, D., Barlow, R. J., Jackson, G., Lafferty, G. D., Cenci, R., Hamilton, B., Jawahery, A., Roberts, D. A., Simi, G., Dallapiccola, C., Salvati, E., Cowan, R., Dujmic, D., Sciolla, G., Lindemann, D., Patel, P. M., Robertson, S. H., Schram, M., Biassoni, P., Lazzaro, A., Lombardo, V., Palombo, F., Stracka, S., Cremaldi, L., Godang, R., Kroeger, R., Sonnek, P., Summers, D. J., Nguyen, X., Taras, P., De Nardo, G., Monorchio, D., Onorato, G., Sciacca, C., Raven, G., Snoek, H. L., Jessop, C. P., Knoepfel, K. J., LoSecco, J. M., Wang, W. F., Corwin, L. A., Honscheid, K., Kass, R., Blount, N. L., Brau, J., Frey, R., Kolb, J. A., Rahmat, R., Sinev, N. B., Strom, D., Strube, J., Torrence, E., Castelli, G., Feltresi, E., Gagliardi, N., Margoni, M., Morandin, M., Posocco, M., Rotondo, M., Simonetto, F., Stroili, R., Ben-Haim, E., Bomben, M., Bonneaud, G. R., Briand, H., Calderini, G., Chauveau, J., Hamon, O., Leruste, Ph., Marchiori, G., Ocariz, J., Sitt, S., Biasini, M., Manoni, E., Rossi, A., Angelini, C., Batignani, G., Bettarini, S., Carpinelli, M., Casarosa, G., Cervelli, A., Forti, F., Giorgi, M. A., Lusiani, A., Neri, N., Paoloni, E., Rizzo, G., Walsh, J. J., Pegna, D. Lopes, Lu, C., Olsen, J., Smith, A. J. S., Telnov, A. V., Anulli, F., Cavoto, G., Faccini, R., Ferrarotto, F., Ferroni, F., Gaspero, M., Gioi, L. Li, Mazzoni, M. A., Piredda, G., Bünger, C., Hartmann, T., Leddig, T., Schröder, H., Waldi, R., Adye, T., Olaiya, E. O., Wilson, F. F., Emery, S., de Monchenault, G. Hamel, Vasseur, G., Yèche, Ch., Allen, M. T., Aston, D., Bard, D. J., Bartoldus, R., Benitez, J. F., Cartaro, C., Convery, M. R., Dorfan, J., Dubois-Felsmann, G. P., Dunwoodie, W., Field, R. C., Sevilla, M. Franco, Fulsom, B. G., Gabareen, A. M., Graham, M. T., Grenier, P., Hast, C., Innes, W. R., Kelsey, M. H., Kim, H., Kim, P., Kocian, M. L., Leith, D. W. G. S., Lewis, P., Li, S., Lindquist, B., Luitz, S., Luth, V., Lynch, H. L., MacFarlane, D. B., Muller, D. R., Neal, H., Nelson, S., O'Grady, C. P., Ofte, I., Perl, M., Pulliam, T., Ratcliff, B. N., Roodman, A., Salnikov, A. A., Santoro, V., Schindler, R. H., Schwiening, J., Snyder, A., Su, D., Sullivan, M. K., Sun, S., Suzuki, K., Thompson, J. M., Va'vra, J., Wagner, A. P., Weaver, M., Wisniewski, W. J., Wittgen, M., Wright, D. H., Wulsin, H. W., Yarritu, A. K., Young, C. C., Ziegler, V., Chen, X. R., Park, W., Purohit, M. V., White, R. M., Wilson, J. R., Randle-Conde, A., Sekula, S. J., Bellis, M., Burchat, P. R., Miyashita, T. S., Alam, M. S., Ernst, J. A., Guttman, N., Soffer, A., Lund, P., Spanier, S. M., Eckmann, R., Ritchie, J. L., Ruland, A. M., Schilling, C. J., Schwitters, R. F., Wray, B. C., Izen, J. M., Lou, X. C., Bianchi, F., Gamba, D., Pelliccioni, M., Lanceri, L., Vitale, L., Lopez-March, N., Martinez-Vidal, F., Oyanguren, A., Ahmed, H., Albert, J., Banerjee, Sw., Choi, H. H. F., Hamano, K., King, G. J., Kowalewski, R., Lewczuk, M. J., Lindsay, C., Nugent, I. M., Roney, J. M., Sobie, R. J., Gershon, T. J., Harrison, P. F., Latham, T. E., Puccio, E. M. T., Band, H. R., Dasu, S., Pan, Y., Prepost, R., Vuosalo, C. O., and Wu, S. L.

Subjects
High Energy Physics - Experiment
Abstract

Using a sample of 122 million Upsilon(3S) events recorded with the BaBar detector at the PEP-II asymmetric-energy e+e- collider at SLAC, we search for the $h_b(1P)$ spin-singlet partner of the P-wave chi_{bJ}(1P) states in the sequential decay Upsilon(3S) --> pi0 h_b(1P), h_b(1P) --> gamma eta_b(1S). We observe an excess of events above background in the distribution of the recoil mass against the pi0 at mass 9902 +/- 4(stat.) +/- 2(syst.) MeV/c^2. The width of the observed signal is consistent with experimental resolution, and its significance is 3.1sigma, including systematic uncertainties. We obtain the value (4.3 +/- 1.1(stat.) +/- 0.9(syst.)) x 10^{-4} for the product branching fraction BF(Upsilon(3S)-->pi0 h_b) x BF(h_b-->gamma eta_b)., Comment: 8 pages, 4 postscript figures, submitted to Phys. Rev. D (Rapid Communications)

Published
2011
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