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180 results on '"Tarbert, C. M."'

1. Photon asymmetry measurements of $\overrightarrow{\gamma} \mathrm{p} \rightarrow \pi^{0} \mathrm{p}$ for E$_{\gamma}$=320$-$650 MeV

Author: Gardner, S., Howdle, D., Sikora, M. H., Wunderlich, Y., Abt, S., Achenbach, P., Afzal, F., Aguar-Bartolome, P., Ahmed, Z., Annand, J. R. M., Arends, H. J., Bantawa, K., Bashkanov, M., Beck, R., Biroth, M., Borisov, N. S., Braghieri, A., Briscoe, W. J., Cherepnya, S., Cividini, F., Costanza, S., Collicott, C., Demissie, B. T., Denig, A., Dieterle, M., Downie, E. J., Drexler, P., Ferretti-Bondy, M. I., Filkov, L. V., Glazier, D. I., Garni, S., Gradl, W., Günther, M., Gurevich, G. M., Hamilton, D., Heid, E., Hornidge, D., Huber, G. M., Jahn, O., Jude, T. C., Käser, A., Kay, S., Kashevarov, V. L., Keshelashvili, I., Kondratiev, R., Korolija, M., Krusche, B., Linturi, J. M., Lisin, V., Livingston, K., Lutterer, S., MacGregor, I. J. D., Macrae, R., Mancell, J., Manley, D. M., Martel, P. P., McGeorge, J. C., McNicoll, E. F., Middleton, D. G., Miskimen, R., Mullen, C., Mushkarenkov, A., Neganov, A. B., Neiser, A., Nikolaev, A., Oberle, M., Ostrick, M., Owens, R. O., Otte, P. B., Oussena, B., Paudyal, D., Pedroni, P., Polonski, A., Prakhov, S., Rajabi, A., Robinson, J., Rosner, G., Rostomyan, T., Sarty, A., Schumann, S., Sokhoyan, V., Spieker, K., Steffen, O., Sfienti, C., Strakovsky, I. I., Strandberg, B., Strub, Th., Supek, I., Tarbert, C. M., Thiel, A., Thiel, M., Thomas, A., Unverzagt, M., Usov, Yu. A., Watts, D. P., Werthmüller, D., Wettig, J., Wolfes, M., Witthauer, L., and Zana, L.
Subjects: Nuclear Experiment
Abstract: High statistics measurements of the photon asymmetry $\mathrm{\Sigma}$ for the $\overrightarrow{\gamma}$p$\rightarrow\pi^{0}$p reaction have been made in the center of mass energy range W=1214-1450 MeV. The data were measured with the MAMI A2 real photon beam and Crystal Ball/TAPS detector systems in Mainz, Germany. The results significantly improve the existing world data and are shown to be in good agreement with previous measurements, and with the MAID, SAID, and Bonn-Gatchina predictions. We have also combined the photon asymmetry results with recent cross-section measurements from Mainz to calculate the profile functions, $\check{\mathrm{\Sigma}}$ (= $\sigma_{0}\mathrm{\Sigma}$), and perform a moment analysis. Comparison with calculations from the Bonn-Gatchina model shows that the precision of the data is good enough to further constrain the higher partial waves, and there is an indication of interference between the very small $F$-waves and the $N(1520) 3/2^{-}$ and $N(1535) 1/2^{-}$ resonances.
Published: 2016
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2. Photoproduction of the $\omega$ meson off the proton near threshold

Author: Strakovsky, I. I., Prakhov, S., Azimov, Y. I., Aguar-Bartolome, P., Annand, J. R. M., Arends, H. J., Bantawa, K., Beck, R., Bekrenev, V., Berghaeuser, H., Braghieri, A., Briscoe, W. J., Brudvik, J., Cherepnya, S., Codling, R. F. B., Collicott, C., Costanza, S., Demissie, B. T., Downie, E. J., Drexler, P., Fil'kov, L. V., Glazier, D. I., Gregor, R., Hamilton, D. J., Heid, E., Hornidge, D., Jaegle, I., Jahn, O., Jude, T. C., Kashevarov, V. L., Keshelashvili, I., Kondratiev, R., Korolija, M., Kotulla, M., Koulbardis, A., Kruglov, S., Krusche, B., Lisin, V., Livingston, K., MacGregor, I. J. D., Maghrbi, Y., Manley, D. M., Marinides, Z., McGeorge, J. C., McNicoll, E. F., Mekterovic, D., Metag, V., Middleton, D. G., Mushkarenkov, A., Nefkens, B. M. K., Nikolaev, A., Novotny, R., Ortega, H., Ostrick, M., Otte, P. B., Oussena, B., Pedroni, P., Pheron, F., Polonski, A., Robinson, J., Rosner, G., Rostomyan, T., Schumann, S., Sikora, M. H., Starostin, A., Supek, I., Taragin, M. F., Tarbert, C. M., Thiel, M., Thomas, A., Unverzagt, M., Watts, D. P., Werthmueller, D., and Zehr, F.
Subjects: Nuclear Experiment, High Energy Physics - Experiment, High Energy Physics - Phenomenology
Abstract: An experimental study of $\omega$ photoproduction on the proton was conducted by using the Crystal Ball and TAPS multiphoton spectrometers together with the photon tagging facility at the Mainz Microtron MAMI. The $\gamma p\to\omega p$ differential cross sections are measured from threshold to the incident-photon energy $E_\gamma=1.40$ GeV ($W=1.87$ GeV for the center-of-mass energy) with 15-MeV binning in $E_\gamma$ and full production-angle coverage. The quality of the present data near threshold gives access to a variety of interesting physics aspects. As an example, an estimation of the $\omega N$ scattering length $\alpha_{\omega p}$ is provided., Comment: 8 pages, 5 figures. Published version; some typos were fixed
Published: 2014
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3. A new measurement of the rare decay eta -> pi^0 gamma gamma with the Crystal Ball/TAPS detectors at the Mainz Microtron

Author: Nefkens, B. M. K., Prakhov, S., Aguar-Bartolomé, P., Annand, J. R. M., Arends, H. J., Bantawa, K., Beck, R., Bekrenev, V., Berghäuser, H., Braghieri, A., Briscoe, W. J., Brudvik, J., Cherepnya, S., Codling, R. F. B., Collicott, C., Costanza, S., Danilkin, I. V., Denig, A., Demissie, B., Dieterle, M., Downie, E. J., Drexler, P., Fil'kov, L. V., Fix, A., Garni, S., Glazier, D. I., Gregor, R., Hamilton, D., Heid, E., Hornidge, D., Howdle, D., Jahn, O., Jude, T. C., Kashevarov, V. L., Käser, A., Keshelashvili, I., Kondratiev, R., Korolija, M., Kotulla, M., Koulbardis, A., Kruglov, S., Krusche, B., Lisin, V., Livingston, K., MacGregor, I. J. D., Maghrbi, Y., Mancel, J., Manley, D. M., McNicoll, E. F., Mekterovic, D., Metag, V., Mushkarenkov, A., Nikolaev, A., Novotny, R., Oberle, M., Ortega, H., Ostrick, M., Ott, P., Otte, P. B., Oussena, B., Pedroni, P., Polonski, A., Robinson, J., Rosner, G., Rostomyan, T., Schumann, S., Sikora, M. H., Starostin, A., Strakovsky, I. I., Strub, T., Suarez, I. M., Supek, I., Tarbert, C. M., Thiel, M., Thomas, A., Unverzagt, M., Watts, D. P., Werthmüller, D., and Witthauer., L.
Subjects: High Energy Physics - Experiment, Nuclear Experiment
Abstract: A new measurement of the rare, doubly radiative decay eta->pi^0 gamma gamma was conducted with the Crystal Ball and TAPS multiphoton spectrometers together with the photon tagging facility at the Mainz Microtron MAMI. New data on the dependence of the partial decay width, Gamma(eta->pi^0 gamma gamma), on the two-photon invariant mass squared, m^2(gamma gamma), as well as a new, more precise value for the decay width, Gamma(eta->pi^0 gamma gamma) = (0.33+/-0.03_tot) eV, are based on analysis of 1.2 x 10^3 eta->pi^0 gamma gamma decays from a total of 6 x 10^7 eta mesons produced in the gamma p -> eta p reaction. The present results for dGamma(eta->pi^0 gamma gamma)/dm^2(gamma gamma) are in good agreement with previous measurements and recent theoretical calculations for this dependence., Comment: 10 pages, 8 figures, 1 table
Published: 2014
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4. Neutron skin of $^{208}$Pb from Coherent Pion Photoproduction

Author: Tarbert, C. M., Watts, D. P., Glazier, D. I., Aguar, P., Ahrens, J., Annand, J. R. M., Arends, H. J., Beck, R., Bekrenev, V., Boillat, B., Braghieri, A., Branford, D., Briscoe, W. J., Brudvik, J., Cherepnya, S., Codling, R., Downie, E. J., Foehl, K., Grabmayr, P., Gregor, R., Heid, E., Hornidge, D., Jahn, O., Kashevarov, V. L., Knezevic, A., Kondratiev, R., Korolija, M., Kotulla, M., Krambrich, D., Krusche, B., Lang, M., Lisin, V., Livingston, K., Lugert, S., MacGregor, I. J. D., Manley, D. M., Martinez, M., McGeorge, J. C., Mekterovic, D., Metag, V., Nefkens, B. M. K., Nikolaev, A., Novotny, R., Owens, R. O., Pedroni, P., Polonski, A., Prakhov, S. N., Price, J. W., Rosner, G., Rost, M., Rostomyan, T., Schadmand, S., Schumann, S., Sober, D., Starostin, A., Supek, I., Thomas, A., Unverzagt, M., Walcher, Th., and Zehr, F.
Subjects: Nuclear Experiment, Nuclear Theory
Abstract: Information on the size and shape of the neutron skin on $^{208}$Pb has been extracted from coherent pion photoproduction cross sections measured using the Crystal Ball together with the Glasgow tagger at the MAMI electron beam facility. On exploitation of an interpolated fit of a theoretical model to the measured cross sections the half-height radius and diffuseness of the neutron distribution are found to be 6.70$\pm 0.03(stat)$ fm and 0.55$\pm 0.01(stat)$$^{+0.02}_{-0.03}(sys)$ fm respectively, corresponding to a neutron skin thickness $\Delta r_{np}$=0.15$\pm 0.03(stat)$$^{+0.01}_{-0.03}(sys)$ fm. The results give the first successful extraction of a neutron skin with an electromagnetic probe and indicate the skin of $^{208}$Pb has a halo character. The measurement provides valuable new constraints on both the structure of nuclei and the equation of state for neutron-rich matter., Comment: 4 figures 5 pages. Version submitted to journal. Includes additional studies of systematic effects in the extracted diffuseness, which led to a small increase in the quoted systematic error. These additional studies are discussed in the revised manuscript. Also includes minor editorial improvements to the text
Published: 2013
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5. A new determination of the eta transition form factor in the Dalitz decay eta -> e^+ e^- gamma with the Crystal Ball/TAPS detectors at the Mainz Microtron

Author: Aguar-Bartolomé, P., Annand, J. R. M., Arends, H. J., Bantawa, K., Beck, R., Bekrenev, V., Berghäuser, H., Braghieri, A., Briscoe, W. J., Brudvik, J., Cherepnya, S., Codling, R. F. B., Collicott, C., Costanza, S., Denig, A., Downie, E. J., Drexler, P., Fil'kov, L. V., Fix, A., Glazier, D. I., Gregor, R., Hamilton, D. J., Heid, E., Hornidge, D., Isaksson, L., Jaegle, I., Jahn, O., Jude, T. C., Kashevarov, V. L., Keshelashvili, I., Kondratiev, R., Korolija, M., Kotulla, M., Koulbardis, A., Kruglov, S., Krusche, B., Lisin, V., Livingston, K., MacGregor, I. J. D., Maghrbi, Y., Manley, D. M., Masjuan, P., McGeorge, J. C., McNicoll, E. F., Mekterovic, D., Metag, V., Mushkarenkov, A., Nefkens, B. M. K., Nikolaev, A., Novotny, R., Ortega, H., Ostrick, M., Ott, P., Otte, P. B., Oussena, B., Pedroni, P., Pheron, F., Polonski, A., Prakhov, S., Robinson, J., Rosner, G., Rostomyan, T., Schumann, S., Sikora, M. H., Sober, D. I., Starostin, A., Strakovsky, I. I., Suarez, I. M., Supek, I., Tarbert, C. M., Thiel, M., Thomas, A., Unverzagt, M., Watts, D. P., Werthmüller, D., and Zehr., F.
Subjects: High Energy Physics - Experiment, Nuclear Experiment
Abstract: The Dalitz decay eta -> e^+ e^- gamma has been measured in the gamma p -> eta p reaction with the Crystal Ball and TAPS multiphoton spectrometers, together with the photon tagging facility at the Mainz Microtron MAMI. The experimental statistic used in this work is one order of magnitude greater than in any previous measurement of eta -> e^+ e^- gamma. The value obtained for the slope parameter 1/Lambda^2 of the eta transition form factor, 1/Lambda^2 = (1.95 +/- 0.15_stat +/- 0.10_syst) [1/GeV^2], is in good agreement with recent measurements conducted in eta -> e^+ e^- gamma and eta -> mu^+ mu^- gamma decays, as well as with recent form-factor calculations. The uncertainty obtained in the value of 1/Lambda^2 is lower compared to results from previous measurements of the eta -> e^+ e^- gamma decay., Comment: 11 pages, 10 figures, 1 table
Published: 2013
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6. Measurement of the g p -> K^0 Sigma^+ reaction with the Crystal Ball/TAPS detectors at the Mainz Microtron

Author: Aguar-Bartolomé, P., Annand, J. R. M., Arends, H. J., Bantawa, K., Beck, R., Bekrenev, V., Berghäuser, H., Braghieri, A., Briscoe, W. J., Brudvik, J., Cherepnya, S., Codling, R. F. B., Collicott, C., Demissie, B., Dieterle, M., Downie, E. J., Drexler, P., Fil'kov, L. V., Fix, A., Glazier, D. I., Gregor, R., Hamilton, D., Heid, E., Hornidge, D., Howdle, D., Isaksson, L., Jaegle, I., Jahn, O., Jude, T. C., Kashevarov, V. L., Keshelashvili, I., Kondratiev, R., Korolija, M., Kotulla, M., Koulbardis, A., Kruglov, S., Krusche, B., Lisin, V., Livingston, K., MacGregor, I. J. D., Maghrbi, Y., Mancel, J., Manley, D. M., McNicoll, E. F., Mekterovic, D., Metag, V., Mushkarenkov, A., Nefkens, B. M. K., Nikolaev, A., Novotny, R., Oberle, M., Ortega, H., Ostrick, M., Ott, P., Otte, P. B., Oussena, B., Pedroni, P., Pheron, F., Polonski, A., Prakhov, S., Robinson, J., Rosner, G., Rostomyan, T., Schumann, S., Sikora, M. H., Sober, D. I., Starostin, A., Strakovsky, I. I., Suarez, I. M., Supek, I., Tarbert, C. M., Thiel, M., Thomas, A., Unverzagt, M., Watts, D. P., Werthmüller, D., Witthauer, L., and Zehr., F.
Subjects: High Energy Physics - Experiment, Nuclear Experiment
Abstract: The g p -> K^0 Sigma^+ reaction has been measured from threshold to Eg=1.45 GeV (W_cm=1.9 GeV) using the Crystal Ball and TAPS multiphoton spectrometers together with the photon tagging facility at the Mainz Microtron MAMI. In the present experiment, this reaction was searched for in the 3pi^0 p final state, by assuming K^0_S -> pi^0 pi^0 and Sigma^+ -> pi^0 p. The experimental results include total and differential cross sections as well as the polarization of the recoil hyperon. The new data significantly improve empirical knowledge about the g p -> K^0 Sigma^+ reaction in the measured energy range. The results are compared to previous measurements and model predictions. It is demonstrated that adding the present g p -> K^0 Sigma^+ results to existing data allowed a better description of this reaction with various models., Comment: 12 pages, 10 figures, 4 tables
Published: 2013
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7. Coherent photoproduction of pi^0- and eta-mesons off 7Li

Author: Maghrbi, Y., Krusche, B., Ahrens, J., Annand, J. R. M., Arends, H. J., Beck, R., Bekrenev, V., Boillat, B., Braghieri, A., Branford, D., Briscoe, W. J., Brudvik, J., Cherepnya, S., Codling, R. F. B., Downie, E. J., Drexler, P., Fil'kov, L. V., Fix, A., Glazier, D. I., Gregor, R., Heid, E., Hornidge, D., Jaegle, I., Jahn, O., Kashevarov, V. L., Keshelashvili, I., Knezevic, A., Kondratiev, R., Korolija, M., Krambrich, D., Lang, M., Lisin, V., Livingston, K., Lugert, S., MacGregor, I. J. D., Manley, D. M., Martinez, M., McGeorge, J. C., Mekterovic, D., Metag, V., Nefkens, B. M. K., Nikolaev, A., Novotny, R., Ostrick, M., Pedroni, P., Pheron, F., Polonski, A., Prakhov, S., Price, J. W., Rosner, G., Rost, M., Rostomyan, T., Schadmand, S., Schumann, S., Sober, D., Starostin, A., Supek, I., Tarbert, C. M., Thomas, A., Unverzagt, M., Watts, D. P., Werthmueller, D., and Zehr, F.
Subjects: Nuclear Experiment
Abstract: Coherent photoproduction of $\pi^0$-mesons from threshold ($E_{th} \approx$ 136 MeV) throughout the $\Delta$-resonance region and of $\eta$-mesons close to the production threshold ($E_{th} \approx$ 570 MeV for $\eta$) has been measured for $^7$Li nuclei. The experiment was performed using the tagged-photon beam of the Mainz MAMI accelerator with the Crystal Ball and TAPS detectors combined to give an almost 4$\pi$ solid-angle electromagnetic calorimeter. The reactions were identified by a combined invariant-mass and missing-energy analysis. A comparison of the pion data to plane-wave impulse modelling tests the nuclear mass form factor. So far coherent $\eta$-production had been only identified for the lightest nuclear systems ($^2$H and $^3$He). For $^3$He a large enhancement of the cross section above plane-wave approximations had been reported, indicating the formation of a quasi-bound state. The present Li-data for $\eta$-production agree with a plane-wave approximation. Contrary to $^3$He, neither a threshold enhancement of the total cross section nor a deviation of the angular distributions from the expected form-factor dependence were observed., Comment: accepted for publication in Eur. Phys. J. A
Published: 2013
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8. Determination of the {\eta} mass with the Crystal Ball at MAMI-B

Author: Nikolaev, A., Aguar-Bartolomé, P., Ahrens, J., Annand, J. R. M., Arends, H. J., Beck, R., Bekrenev, V., Boillat, B., Braghieri, A., Branford, D., Briscoe, W. J., Brudvik, J. W., Cherepnya, S., Codling, R., Dehn, M., Downie, E. J., Fil'kov, L. V., Glazier, D. I., Gregor, R., Heid, E., Hornidge, D., Jahn, O., Jankowiak, A., Kaiser, K. -H., Kashevarov, V. L., Kondratiev, R., Korolija, M., Kotulla, M., Krambrich, D., Krusche, B., Lang, M., Lisin, V., Livingston, K., Ludwig-Mertin, U., Lugert, S., MacGregor, I. J. D., Manley, D. M., Martinez-Fabregate, M., McGeorge, J. C., Mekterovic, D., Metag, V., Nefkens, B. M. K., Novotny, R., Owens, R. O., Pedroni, P., Polonski, A., Prakhov, S. N., Price, J. W., Reiter, A., Rosner, G., Rost, M., Rostomyan, T., Schumann, S., Sober, D., Starostin, A., Supek, I., Tarbert, C. M., Thomas, A., Unverzagt, M., Walcher, Th., Watts, D. P., and Zehr, F.
Subjects: Nuclear Experiment
Abstract: A new precise determination of the {\eta} meson mass is presented. It is based on a measurement of the threshold for the {\gamma}p -> p{\eta} reaction using the tagger focal-plane microscope detector at the MAMI-B facility in Mainz. The tagger microscope has a higher energy resolution than the standard tagging spectrometer and, hence, allowed an improvement in the accuracy compared to the previous {\eta} mass measurement at MAMI-B. The result m{\eta} = (547.851 +- 0.031 stat. +- 0.062 syst.) MeV agrees very well with the precise values of the NA48, KLOE and CLEO collaborations and deviates by about 5{\sigma} from the smaller, but also very precise value obtained by the GEM collaboration at COSY., Comment: Submitted for publication in EPJA
Published: 2012

9. Photoproduction of pi0pi0 and pi0pi+-pairs off the proton from threshold to the second resonance region

Author: Zehr, F., Krusche, B., Aguar, P., Ahrens, J., Annand, J. R. M., Arends, H. J., Beck, R., Bekrenev, V., Boillat, B., Braghieri, A., Branford, D., Briscoe, W. J., Brudvik, J., Cherepnya, S., Codling, R. F. B., Downie, E. J., Drexler, P., Glazier, D. I., Fil'kov, L. V., Gregor, R., Heid, E., Hornidge, D., Jaegle, I., Jahn, O., Kashevarov, V. L., Knezevic, A., Kondratiev, R., Korolija, M., Kotulla, M., Krambrich, D., Kulbardis, A., Lang, M., Lisin, V., Livingston, K., Lugert, S., MacGregor, I. J. D., Manley, D. M., Maghrbi, Y., Martinez, M., McGeorge, J. C., Mekterovic, D., Metag, V., Nefkens, B. M. K., Nikolaev, A., Ostrick, M., Pedroni, P., Pheron, F., Polonski, A., Prakhov, S., Price, J. W., Rosner, G., Rost, M., Rostomyan, T., Schumann, S., Sober, D., Starostin, A., Supek, I., Tarbert, C. M., Thomas, A., Unverzagt, M., Walcher, Th., and Watts, D. P.
Subjects: Nuclear Experiment
Abstract: Precise total cross-sections and invariant-mass distributions have been measured for photoproduction of pion pairs off the proton producing $p\pi^0\pi^0$ and $n\pi^+\pi^0$ final states from the threshold region up to 800 MeV incident photon energy. Additionally, beam helicity asymmetries have been measured in the second resonance region (550 MeV - 820 MeV). The experiment was performed at the tagged photon beam of the Mainz MAMI accelerator with the Crystal Ball and TAPS detectors combined to give an almost 4$\pi$ solid-angle electromagnetic calorimeter. The results are much more precise than any previous measurements and confirm the chiral perturbation theory predictions for the threshold behavior of these reactions. In the second resonance region, the invariant-mass distributions of meson-meson and meson-nucleon pairs are in reasonable agreement with model predictions, but none of the models reproduce the asymmetries for the mixed-charge channel., Comment: accepted for publication in Eur. Phys. J. A
Published: 2012
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10. Study of the gamma p --> pi0 pi0 p reaction with the Crystal Ball/TAPS at the Mainz

Author: Kashevarov, V. L., Fix, A., Prakhov, S., Aguar-Bartolomé, P., Annand, J. R. M., Arends, H. J., Bantawa, K., Beck, R., Bekrenev, V., Berghäuser, H., Braghieri, A., Briscoe, W. J., Brudvik, J., Cherepnya, S., Codling, R. F. B., Downie, E. J., Drexler, P., Fil'kov, L. V., Glazier, D. I., Gregor, R., Heid, E., Hornidge, D., Isaksson, L., Jaegle, I., Jahn, O., Jude, T. C., Keshelashvili, I., Kondratiev, R., Korolija, M., Kotulla, M., Koulbardis, A., Kruglov, S., Krusche, B., Lisin, V., Livingston, K., MacGregor, I. J. D., Maghrbi, Y., Manley, D. M., McGeorge, J. C., McNicoll, E. F., Mekterovic, D., Metag, V., Mushkarenkov, A., Nefkens, B. M. K., Nikolaev, A., Novotny, R., Ortega, H., Ostrick, M., Ott, P., Otte, P. B., Oussena, B., Pedroni, P., Pheron, F., Polonski, A., Robinson, J., Rosner, G., Rostomyan, T., Schumann, S., Sikora, M. H., Sober, D. I., Starostin, A., Strakovsky, I. I., Suarez, I. M., Supek, I., Tarbert, C. M., Thiel, M., Thomas, A., Unverzagt, M., Watts, D. P., Werthmüller, D., and Zehr, F.
Subjects: Nuclear Experiment, High Energy Physics - Experiment, Nuclear Theory
Abstract: The gamma p --> pi0 pi0 p reaction has been measured from threshold to 1.4 GeV using the Crystal Ball and TAPS photon spectrometers together with the photon tagging facility at the Mainz Microtron. The experimental results include total and differential cross sections as well as specific angular distributions, which were used to extract partial-wave amplitudes. In particular, the energy region below the D13(1520) resonance was studied., Comment: 12 pages, 13 figures, corrected version, published in PRC
Published: 2012
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11. First Measurement of the Form Factors in the Decays D0 to rho- e+ nu_e and D+ to rho0 e+ nu_e

Author: CLEO Collaboration, Dobbs, S., Metreveli, Z., Seth, K. K., Tomaradze, A., Xiao, T., Martin, L., Powell, A., Wilkinson, G., Mendez, H., Ge, J. Y., Huang, G. S., Miller, D. H., Pavlunin, V., Shipsey, I. P. J., Xin, B., Adams, G. S., Hu, D., Moziak, B., Napolitano, J., Ecklund, K. M., Insler, J., Muramatsu, H., Park, C. S., Pearson, L. J., Thorndike, E. H., Ricciardi, S., Thomas, C., Artuso, M., Blusk, S., Mountain, R., Skwarnicki, T., Stone, S., Zhang, L. M., Bonvicini, G., Cinabro, D., Lincoln, A., Smith, M. J., Zhou, P., Zhu, J., Naik, P., Rademacker, J., Asner, D. M., Edwards, K. W., Randrianarivony, K., Tatishvili, G., Briere, R. A., Vogel, H., Onyisi, P. U. E., Rosner, J. L., Alexander, J. P., Cassel, D. G., Das, S., Ehrlich, R., Gibbons, L., Gray, S. W., Hartill, D. L., Heltsley, B. K., Kreinick, D. L., Kuznetsov, V. E., Patterson, J. R., Peterson, D., Riley, D., Ryd, A., Sadoff, A. J., Shi, X., Sun, W. M., Yelton, J., Rubin, P., Lowrey, N., Mehrabyan, S., Selen, M., Wiss, J., Libby, J., Kornicer, M., Mitchell, R. E., Tarbert, C. M., Besson, D., Pedlar, T. K., Cronin-Hennessy, D., and Hietala, J.
Subjects: High Energy Physics - Experiment
Abstract: Using the entire CLEO-c psi(3770) to DDbar event sample, corresponding to an integrated luminosity of 818 pb^-1 and approximately 5.4 x 10^6 DDbar events, we measure the form factors for the decays D0 to rho- e+ nu_e and D+ to rho0 e+ nu_e for the first time and the branching fractions with improved precision. A four-dimensional unbinned maximum likelihood fit determines the form factor ratios to be: V(0)/A_1(0) = 1.48 +- 0.15 +- 0.05 and A_2(0)/A_1(0)= 0.83 +- 0.11 +- 0.04. Assuming CKM unitarity, the known D meson lifetimes and our measured branching fractions we obtain the form factor normalizations A_1(0), A_2(0), and V(0). We also present a measurement of the branching fraction for D^+ to omega e^+ nu_e with improved precision., Comment: 9 pages, available through http://www.lns.cornell.edu/public/CLNS/, submitted to PRL
Published: 2011
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12. Branching fractions for Y(3S) -> pi^0 h_b and psi(2S) -> pi^0 h_c

Author: CLEO Collaboration, Ge, J. Y., Miller, D. H., Shipsey, I. P. J., Xin, B., Adams, G. S., Napolitano, J., Ecklund, K. M., Insler, J., Muramatsu, H., Park, C. S., Pearson, L. J., Thorndike, E. H., Ricciardi, S., Thomas, C., Artuso, M., Blusk, S., Mountain, R., Skwarnicki, T., Stone, S., Zhang, L. M., Bonvicini, G., Cinabro, D., Lincoln, A., Smith, M. J., Zhou, P., Zhu, J., Naik, P., Rademacker, J., Asner, D. M., Edwards, K. W., Randrianarivony, K., Tatishvili, G., Briere, R. A., Vogel, H., Onyisi, P. U. E., Rosner, J. L., Alexander, J. P., Cassel, D. G., Das, S., Ehrlich, R., Gibbons, L., Gray, S. W., Hartill, D. L., Heltsley, B. K., Kreinick, D. L., Kuznetsov, V. E., Patterson, J. R., Peterson, D., Riley, D., Ryd, A., Sadoff, A. J., Shi, X., Sun, W. M., Yelton, J., Rubin, P., Lowrey, N., Mehrabyan, S., Selen, M., Wiss, J., Libby, J., Kornicer, M., Mitchell, R. E., Tarbert, C. M., Besson, D., Pedlar, T. K., Cronin-Hennessy, D., Hietala, J., Dobbs, S., Metreveli, Z., Seth, K. K., Tomaradze, A., Xiao, T., Martin, L., Powell, A., and Wilkinson, G.
Subjects: High Energy Physics - Experiment
Abstract: Using e^+e^- collision data corresponding to 5.88M Y(3S) [25.9M psi(2S)] decays and acquired by the CLEO III [CLEO-c] detectors operating at CESR, we study the single-pion transitions from Y(3S) [psi(2S)] to the respective spin-singlet states h_{b[c]}. Utilizing only the momentum of suitably selected transition-pi^0 candidates, we obtain the upper limit B(Y(3S) -> pi^0 h_b) < 1.2\times 10^{-3} at 90% confidence level, and measure B(psi(2S) -> pi^0 h_c) = (9.0+-1.5+-1.3)\times 10^{-4}. Signal sensitivities are enhanced by excluding very asymmetric pi^0 -> gamma gamma candidates., Comment: 12 pages 4 figures, version published in Physical Review D
Published: 2011
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13. Analysis of the Decay D^0 to K^0_S pi^0 pi^0

Author: CLEO Collaboration, Lowrey, N., Mehrabyan, S., Selen, M., Wiss, J., Libby, J., Kornicer, M., Mitchell, R. E., Shepherd, M. R., Tarbert, C. M., Besson, D., Pedlar, T. K., Xavier, J., Cronin-Hennessy, D., Hietala, J., Zweber, P., Dobbs, S., Metreveli, Z., Seth, K. K., Tomaradze, A., Xiao, T., Brisbane, S., Martin, L., Powell, A., Spradlin, P., Wilkinson, G., Mendez, H., Ge, J. Y., Miller, D. H., Shipsey, I. P. J., Xin, B., Adams, G. S., Hu, D., Moziak, B., Napolitano, J., Ecklund, K. M., Insler, J., Muramatsu, H., Park, C. S., Pearson, L. J., Thorndike, E. H., Yang, F., Ricciardi, S., Thomas, C., Artuso, M., Blusk, S., Mountain, R., Skwarnicki, T., Stone, S., Wang, J. C., Zhang, L. M., Bonvicini, G., Cinabro, D., Lincoln, A., Smith, M. J., Zhou, P., Zhu, J., Naik, P., Rademacker, J., Asner, D. M., Edwards, K. W., Randrianarivony, K., Tatishvili, G., Briere, R. A., Vogel, H., Onyisi, P. U. E., Rosner, J. L., Alexander, J. P., Cassel, D. G., Das, S., Ehrlich, R., Fields, L., Gibbons, L., Gray, S. W., Hartill, D. L., Heltsley, B. K., Kreinick, D. L., Kuznetsov, V. E., Patterson, J. R., Peterson, D., Riley, D., Ryd, A., Sadoff, A. J., Shi, X., Sun, W. M., Yelton, J., and Rubin, P.
Subjects: High Energy Physics - Experiment
Abstract: We present the results of a Dalitz plot analysis of D^0 to K^0_S pi^0 pi^0 using the CLEO-c data set of 818 inverse pico-barns of e^+ e^- collisions accumulated at sqrt{s} = 3.77 GeV. This corresponds to three million D^0 D^0-bar pairs from which we select 1,259 tagged candidates with a background of 7.5 +- 0.9 percent. Several models have been explored, all of which include the K^*(892), K^*_2(1430), K^*(1680), the f_0(980), and the sigma(500). We find that the combined pi^0 pi^0 S-wave contribution to our preferred fit is (28.9 +- 6.3 +- 3.1)% of the total decay rate while D^0 to K^*(892)^0 pi^0 contributes (65.6 +- 5.3 +- 2.5)%. Using three tag modes and correcting for quantum correlations we measure the D^0 to K^0_S pi^0 pi^0 branching fraction to be (1.059 +- 0.038 +- 0.061)%., Comment: 11 pages, 3 figures, available through http://www.lns.cornell.edu/public/CLNS/, submitted to PRD
Published: 2011
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14. Observation of the Dalitz Decay $D_{s}^{*+} \to D_{s}^{+} e^{+} e^{-}$

Author: Cronin-Hennessy, D., Hietala, J., Dobbs, S., Metreveli, Z., Seth, K. K., Tomaradze, A., Xiao, T., Martin, L., Powell, A., Wilkinson, G., Mendez, H., Ge, J. Y., Miller, D. H., Shipsey, I. P. J., Xin, B., Adams, G. S., Hu, D., Moziak, B., Napolitano, J., Ecklund, K. M., Insler, J., Muramatsu, H., Park, C. S., Pearson, L. J., Thorndike, E. H., Ricciardi, S., Thomas, C., Artuso, M., Blusk, S., Mountain, R., Skwarnicki, T., Stone, S., Zhang, L. M., Bonvicini, G., Cinabro, D., Lincoln, A., Smith, M. J., Zhou, P., Zhu, J., Naik, P., Rademacker, J., Asner, D. M., Edwards, K. W., Randrianarivony, K., Tatishvili, G., Briere, R. A., Vogel, H., Onyisi, P. U. E., Rosner, J. L., Alexander, J. P., Cassel, D. G., Das, S., Ehrlich, R., Gibbons, L., Gray, S. W., Hartill, D. L., Heltsley, B. K., Kreinick, D. L., Kuznetsov, V. E., Patterson, J. R., Peterson, D., Riley, D., Ryd, A., Sadoff, A. J., Shi, X., Sun, W. M., Yelton, J., Rubin, P., Lowrey, N., Mehrabyan, S., Selen, M., Wiss, J., Libby, J., Kornicer, M., Mitchell, R. E., Shepherd, M. R., Tarbert, C. M., Besson, D., and Pedlar, T. K.
Subjects: High Energy Physics - Experiment
Abstract: Using 586 $\textrm{pb}^{-1}$ of $e^{+}e^{-}$ collision data acquired at $\sqrt{s}=4.170$ GeV with the CLEO-c detector at the Cornell Electron Storage Ring, we report the first observation of $D_{s}^{*+} \to D_{s}^{+} e^{+} e^{-}$ with a significance of $5.3 \sigma$. The ratio of branching fractions $\calB(D_{s}^{*+} \to D_{s}^{+} e^{+} e^{-}) / \calB(D_{s}^{*+} \to D_{s}^{+} \gamma)$ is measured to be $[ 0.72^{+0.15}_{-0.13} (\textrm{stat}) \pm 0.10 (\textrm{syst})]%$, which is consistent with theoretical expectations.
Published: 2011
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15. Observation of the h_c(1P) using e^+e^- collisions above DDbar threshold

Author: CLEO Collaboration, Pedlar, T. K., Cronin-Hennessy, D., Hietala, J., Dobbs, S., Metreveli, Z., Seth, K. K., Tomaradze, A., Xiao, T., Martin, L., Powell, A., Wilkinson, G., Mendez, H., Ge, J. Y., Miller, D. H., Shipsey, I. P. J., Xin, B., Adams, G. S., Hu, D., Moziak, B., Napolitano, J., Ecklund, K. M., Insler, J., Muramatsu, H., Park, C. S., Pearson, L. J., Thorndike, E. H., Ricciardi, S., Thomas, C., Artuso, M., Blusk, S., Mountain, R., Skwarnicki, T., Stone, S., Zhang, L. M., Bonvicini, G., Cinabro, D., Lincoln, A., Smith, M. J., Zhou, P., Zhu, J., Naik, P., Rademacker, J., Asner, D. M., Edwards, K. W., Randrianarivony, K., Tatishvili, G., Briere, R. A., Vogel, H., Onyisi, P. U. E., Rosner, J. L., Alexander, J. P., Cassel, D. G., Das, S., Ehrlich, R., Gibbons, L., Gray, S. W., Hartill, D. L., Heltsley, B. K., Kreinick, D. L., Kuznetsov, V. E., Patterson, J. R., Peterson, D., Riley, D., Ryd, A., Sadoff, A. J., Shi, X., Sun, W. M., Yelton, J., Rubin, P., Lowrey, N., Mehrabyan, S., Selen, M., Wiss, J., Libby, J., Kornicer, M., Mitchell, R. E., Shepherd, M. R., Tarbert, C. M., and Besson, D.
Subjects: High Energy Physics - Experiment
Abstract: Using 586pb^-1 of e^+e^- collision data at E_CM = 4170MeV, produced at the CESR collider and collected with the CLEO-c detector, we observe the process e^+e^- --> pi^+ pi^- h_c(1P). We measure its cross section to be 15.6+-2.3+-1.9+-3.0pb, where the third error is due to the external uncertainty on the branching fraction of psi(2S) --> pi^0 h_c(1P), which we use for normalization. We also find evidence for e^+e^- --> eta h_c(1P) at 4170MeV at the 3sigma level, and see hints of a rise in the e^+e^- --> pi^+ pi^- h_c(1P) cross section at 4260MeV., Comment: 9 pages, 4 figures, as published
Published: 2011
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16. Upsilon(1S)->gamma+f2'(1525); f2'(1525)->K0sK0s decays

Author: The CLEO Collaboration, Besson, D., Hogan, D. P., Pedlar, T. K., Cronin-Hennessy, D., Hietala, J., Zweber, P., Dobbs, S., Metreveli, Z., Seth, K. K., Tomaradze, A., Xiao, T., Brisbane, S., Martin, L., Powell, A., Spradlin, P., Wilkinson, G., Mendez, H., Ge, J. Y., Miller, D. H., Shipsey, I. P. J., Xin, B., Adams, G. S., Hu, D., Moziak, B., Napolitano, J., Ecklund, K. M., Insler, J., Muramatsu, H., Park, C. S., Pearson, L. J., Thorndike, E. H., Yang, F., Ricciardi, S., Thomas, C., Artuso, M., Blusk, S., Mountain, R., Skwarnicki, T., Stone, S., Wang, J. C., Zhang, L. M., Bonvicini, G., Cinabro, D., Lincoln, A., Smith, M. J., Zhou, P., Zhu, J., Naik, P., Rademacker, J., Asner, D. M., Edwards, K. W., Randrianarivony, K., Tatishvili, G., Briere, R. A., Vogel, H., Onyisi, P. U. E., Rosner, J. L., Alexander, J. P., Cassel, D. G., Das, S., Ehrlich, R., Fields, L., Gibbons, L., Gray, S. W., Hartill, D. L., Heltsley, B. K., Kreinick, D. L., Kuznetsov, V. E., Patterson, J. R., Peterson, D., Riley, D., Ryd, A., Sadoff, A. J., Shi, X., Sun, W. M., Yelton, J., Rubin, P., Lowrey, N., Mehrabyan, S., Selen, M., Wiss, J., Libby, J., Kornicer, M., Mitchell, R. E., and Tarbert, C. M.
Subjects: High Energy Physics - Experiment
Abstract: We report on a study of exclusive radiative decays of the Upsilon(1S) resonance into a final state consisting of a photon and two K0s candidates. We find evidence for a signal for Upsilon(1S)->gamma f_2'(1525); f_2'(1525)->K0sK0s, at a rate (4.0+/-1.3+/-0.6)x10^{-5}, consistent with previous observations of Upsilon(1S)->gamma f_2'(1525); f_2'(1525)->K+K-, and isospin. Combining this branching fraction with existing branching fraction measurements of Upsilon(1S)->gamma f_2'(1525) and J/psi->gamma f_2'(1525), we obtain the ratio of branching fractions: B(Upsilon(1S)->gamma f_2'(1525))/B(J/psi->gamma f_2'(1525))=0.09+/-0.02, approximately consistent with expectations based on soft collinear effective theory., Comment: submitted to Brief Reports
Published: 2010
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17. Measurements of branching fractions for electromagnetic transitions involving the $\chi_{bJ}(1P)$ states

Author: The CLEO Collaboration, Kornicer, M., Mitchell, R. E., Tarbert, C. M., Besson, D., Pedlar, T. K., Cronin-Hennessy, D., Hietala, J., Zweber, P., Dobbs, S., Metreveli, Z., Seth, K. K., Tomaradze, A., Xiao, T., Brisbane, S., Martin, L., Powell, A., Spradlin, P., Wilkinson, G., Mendez, H., Ge, J. Y., Miller, D. H., Shipsey, I. P. J., Xin, B., Adams, G. S., Hu, D., Moziak, B., Napolitano, J., Ecklund, K. M., Insler, J., Muramatsu, H., Park, C. S., Pearson, L. J., Thorndike, E. H., Yang, F., Ricciardi, S., Thomas, C., Artuso, M., Blusk, S., Mountain, R., Skwarnicki, T., Stone, S., Wang, J. C., Zhang, L. M., Bonvicini, G., Cinabro, D., Lincoln, A., Smith, M. J., Zhou, P., Zhu, J., Naik, P., Rademacker, J., Asner, D. M., Edwards, K. W., Randrianarivony, K., Tatishvili, G., Briere, R. A., Vogel, H., Onyisi, P. U. E., Rosner, J. L., Alexander, J. P., Cassel, D. G., Das, S., Ehrlich, R., Fields, L., Gibbons, L., Gray, S. W., Hartill, D. L., Heltsley, B. K., Kreinick, D. L., Kuznetsov, V. E., Patterson, J. R., Peterson, D., Riley, D., Ryd, A., Sadoff, A. J., Shi, X., Sun, W. M., Yelton, J., Rubin, P., Lowrey, N., Mehrabyan, S., Selen, M., Wiss, J., and Libby, J.
Subjects: High Energy Physics - Experiment
Abstract: Using 9.32, 5.88 million Upsilon(2S,3S) decays taken with the CLEO-III detector, we obtain five product branching fractions for the exclusive processes Upsilon(2S) => gamma chi_{b0,1,2}(1P) => gamma gamma Upsilon(1S) and Upsilon(3S) => gamma chi_{b1,2}(1P) => gamma gamma Upsilon(1S). We observe the transition chi_{b0}(1P) => gamma Upsilon(1S) for the first time. Using the known branching fractions for B[Upsilon(2S) => gamma chi_{bJ}(1P)], we extract values for B[chi_{bJ}(1P) => gamma Upsilon(1S)] for J=0, 1, 2. In turn, these values can be used to unfold the Upsilon(3S) product branching fractions to obtain values for B[Upsilon(3S) => gamma chi_{b1,2}(1P) for the first time individually. Comparison of these with each other and with the branching fraction B[Upsilon(3S) => gamma chi_{b0}] previously measured by CLEO provides tests of relativistic corrections to electric dipole matrix elements., Comment: 22 pages, 6 figures, version published in Physical Review D
Published: 2010
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18. Studies of D^+ -> {eta', eta, phi} e^+ nu_e

Author: CLEO Collaboration, Yelton, J., Rubin, P., Lowrey, N., Mehrabyan, S., Selen, M., Wiss, J., Kornicer, M., Mitchell, R. E., Shepherd, M. R., Tarbert, C. M., Besson, D., Pedlar, T. K., Xavier, J., Cronin-Hennessy, D., Hietala, J., Zweber, P., Dobbs, S., Metreveli, Z., Seth, K. K., Tomaradze, A., Xiao, T., Brisbane, S., Libby, J., Martin, L., Powell, A., Spradlin, P., Wilkinson, G., Mendez, H., Ge, J. Y., Miller, D. H., Shipsey, I. P. J., Xin, B., Adams, G. S., Hu, D., Moziak, B., Napolitano, J., Ecklund, K. M., Insler, J., Muramatsu, H., Park, C. S., Pearson, L. J., Thorndike, E. H., Yang, F., Ricciardi, S., Thomas, C., Artuso, M., Blusk, S., Mountain, R., Skwarnicki, T., Stone, S., Wang, J. C., Zhang, L. M., Bonvicini, G., Cinabro, D., Lincoln, A., Smith, M. J., Zhou, P., Zhu, J., Naik, P., Rademacker, J., Asner, D. M., Edwards, K. W., Randrianarivony, K., Tatishvili, G., Briere, R. A., Vogel, H., Onyisi, P. U. E., Rosner, J. L., Alexander, J. P., Cassel, D. G., Das, S., Ehrlich, R., Fields, L., Gibbons, L., Gray, R., Gray, S. W., Hartill, D. L., Heltsley, B. K., Kreinick, D. L., Kuznetsov, V. E., Patterson, J. R., Peterson, D., Riley, D., Ryd, A., Sadoff, A. J., Shi, X., and Sun, W. M.
Subjects: High Energy Physics - Experiment
Abstract: We report the first observation of the decay D^+ -> eta' e^+ nu_e in two analyses, which combined provide a branching fraction of B(D+ -> eta' e nu) = (2.16 +/- 0.53 +/- 0.07) x 10^{-4}. We also provide an improved measurement of B(D+ -> eta e nu) = (11.4 +/- 0.9 +/- 0.4) x 10^{-4}, provide the first form factor measurement, and set the improved upper limit B(D+ -> phi e nu) < 0.9 x 10^{-4} (90% C.L.)., Comment: 15 pages, 6 figures, available through http://www.lns.cornell.edu/public/CLNS/, submitted to PRD. Minor edits, added appendix with fit results using alternate form factor parameterizations
Published: 2010
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19. Model-independent determination of the strong-phase difference between D^0 and D^0-bar-> K^0_S,L h^+ h^- (h=pi,K) and its impact on the measurement of the CKM angle gamma/phi_3

Author: Libby, J., Kornicer, M., Mitchell, R. E., Shepherd, M. R., Tarbert, C. M., Besson, D., Pedlar, T. K., Xavier, J., Cronin-Hennessy, D., Hietala, J., Zweber, P., Dobbs, S., Metreveli, Z., Seth, K. K., Tomaradze, A., Xiao, T., Brisbane, S., Malde, S., Martin, L., Powell, A., Spradlin, P., Wilkinson, G., Mendez, H., Ge, J. Y., Miller, D. H., Shipsey, I. P. J., Xin, B., Adams, G. S., Hu, D., Moziak, B., Napolitano, J., Ecklund, K. M., Insler, J., Muramatsu, H., Park, C. S., Pearson, L. J., Thorndike, E. H., Yang, F., Ricciardi, S., Thomas, C., Artuso, M., Blusk, S., Horwitz, N., Mountain, R., Skwarnicki, T., Stone, S., Wang, J. C., Zhang, L. M., Gershon, T., Bonvicini, G., Cinabro, D., Lincoln, A., Smith, M. J., Zhou, P., Zhu, J., Naik, P., Rademacker, J., Asner, D. M., Edwards, K. W., Randrianarivony, K., Tatishvili, G., Briere, R. A., Vogel, H., Onyisi, P. U. E., Rosner, J. L., Cassel, J. P. Alexander D. G., Das, S., Ehrlich, R., Fields, L., Gibbons, L., Hartill, S. W. Gray D. L., Heltsley, B. K., Kreinick, D. L., Peterson, V. E. Kuznetsov J. R. Patterson D., Riley, D., Ryd, A., Shi, A. J. Sadoff X., Sun, W. M., Yelton, J., Rubin, P., Lowrey, N., Mehrabyan, S., Selen, M., and Wiss, J.
Subjects: High Energy Physics - Experiment
Abstract: We report the first determination of the relative strong-phase difference between D^0 -> K^0_S,L K^+ K^- and D^0-bar -> K^0_S,L K^+ K^-. In addition, we present updated measurements of the relative strong-phase difference between D^0 -> K^0_S,L pi^+ pi^- and D^0-bar -> K^0_S,L pi^+ pi^-. Both measurements exploit the quantum coherence between a pair of D^0 and D^0-bar mesons produced from psi(3770) decays. The strong-phase differences measured are important for determining the Cabibbo-Kobayashi-Maskawa angle gamma/phi_3 in B^- -> K^- D^0-tilde decays, where D^0-tilde is a D^0 or D^0-bar meson decaying to K^0_S h^+ h^- (h=pi,K), in a manner independent of the model assumed to describe the D^0 -> K^0_S h^+ h^- decay. Using our results, the uncertainty in gamma/phi_3 due to the error on the strong-phase difference is expected to be between 1.7 and 3.9 degrees for an analysis using B^- K^- D^0-tilde D^0-tilde -> K^0_S pi^+ pi^- decays, and between 3.2 and 3.9 degrees for an analysis based on B^- -> K^- D^0-tilde, D^0-tilde -> K^0_S K^+ K^- decays. A measurement is also presented of the CP-odd fraction, F_-, of the decay D^0 -> K^0_S K^+ K^- in the region of the phi -> K^+ K^- resonance. We find that in a region within 0.01 GeV^2/c^4 of the nominal phi mass squared F_- > 0.91 at the 90% confidence level., Comment: 60 pages also available through http://www.lns.cornell.edu/public/CLNS/, accepted for publication in PRD
Published: 2010
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20. Search for rare and forbidden decays of charm and charmed-strange mesons to final states h^+- e^-+ e^+

Author: CLEO Collaboration, Rubin, P., Lowrey, N., Mehrabyan, S., Selen, M., Wiss, J., Libby, J., Kornicer, M., Mitchell, R. E., Shepherd, M. R., Tarbert, C. M., Besson, D., Pedlar, T. K., Xavier, J., Cronin-Hennessy, D., Hietala, J., Zweber, P., Dobbs, S., Metreveli, Z., Seth, K. K., Tomaradze, A., Xiao, T., Brisbane, S., Martin, L., Powell, A., Spradlin, P., Wilkinson, G., Mendez, H., Ge, J. Y., Miller, D. H., Shipsey, I. P. J., Xin, B., Adams, G. S., Hu, D., Moziak, B., Napolitano, J., Ecklund, K. M., Insler, J., Muramatsu, H., Park, C. S., Pearson, L. J., Thorndike, E. H., Yang, F., Ricciardi, S., Thomas, C., Artuso, M., Blusk, S., Mountain, R., Skwarnicki, T., Stone, S., Wang, J. C., Zhang, L. M., Bonvicini, G., Cinabro, D., Lincoln, A., Smith, M. J., Zhou, P., Zhu, J., Naik, P., Rademacker, J., Asner, D. M., Edwards, K. W., Randrianarivony, K., Tatishvili, G., Briere, R. A., Vogel, H., Onyisi, P. U. E., Rosner, J. L., Alexander, J. P., Cassel, D. G., Das, S., Ehrlich, R., Fields, L., Gibbons, L., Gray, S. W., Hartill, D. L., Heltsley, B. K., Kreinick, D. L., Kuznetsov, V. E., Patterson, J. R., Peterson, D., Riley, D., Ryd, A., Sadoff, A. J., Shi, X., Sun, W. M., and Yelton, J.
Subjects: High Energy Physics - Experiment
Abstract: We have searched for flavor-changing neutral current decays and lepton-number-violating decays of D^+ and D^+_s mesons to final states of the form h^+- e^-+ e^+, where h is either \pi or K. We use the complete samples of CLEO-c open-charm data, corresponding to integrated luminosities of 818 pb^-1 at the center-of-mass energy E_CM = 3.774 GeV containing 2.4 x 10^6 D^+D^- pairs and 602 pb^-1 at E_CM = 4.170 GeV containing 0.6 x 10^6 D^*+-_s D^-+_s pairs. No signal is observed in any channel, and we obtain 90% confidence level upper limits on branching fractions B(D^+ --> \pi^+ e^+ e^-) < 5.9 x 10^-6, B(D^+ --> \pi^- e^+ e^+) < 1.1 x 10^-6, B(D^+ --> K^+ e^+ e^-) < 3.0 x 10^-6, B(D^+ --> K^- e^+ e^+) < 3.5 x 10^-6, B(D^+_s --> \pi^+ e^+ e^-) < 2.2 x 10^-5, B(D^+_s --> \pi^- e^+ e^+) < 1.8 x 10^-5, B(D^+_s --> K^+ e^+ e^-) < 5.2 x 10^-5, and B(D^+_s --> K^- e^+ e^+) < 1.7 x 10^-5., Comment: 9 pages, available through http://www.lns.cornell.edu/public/CLNS/
Published: 2010
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21. Study of psi(2S) Decays to gamma p bar{p}, pi^0 p bar{p} and eta p bar{p} and Search for p bar{p} Threshold Enhancements

Author: CLEO Collaboration, Alexander, J. P., Cassel, D. G., Das, S., Ehrlich, R., Fields, L., Gibbons, L., Gray, S. W., Hartill, D. L., Heltsley, B. K., Kreinick, D. L., Kuznetsov, V. E., Patterson, J. R., Peterson, D., Riley, D., Ryd, A., Sadoff, A. J., Shi, X., Sun, W. M., Yelton, J., Rubin, P., Lowrey, N., Mehrabyan, S., Selen, M., Wiss, J., Adams, S., Kornicer, M., Mitchell, R. E., Shepherd, M. R., Tarbert, C. M., Besson, D., Pedlar, T. K., Xavier, J., Cronin-Hennessy, D., Hietala, J., Zweber, P., Dobbs, S., Metreveli, Z., Seth, K. K., Tomaradze, A., Xiao, T., Brisbane, S., Libby, J., Martin, L., Powell, A., Spradlin, P., Wilkinson, G., Mendez, H., Ge, J. Y., Miller, D. H., Shipsey, I. P. J., Xin, B., Adams, G. S., Hu, D., Moziak, B., Napolitano, J., Ecklund, K. M., Insler, J., Muramatsu, H., Park, C. S., Pearson, L. J., Thorndike, E. H., Yang, F., Ricciardi, S., Thomas, C., Artuso, M., Blusk, S., Mountain, R., Skwarnicki, T., Stone, S., Wang, J. C., Zhang, L. M., Bonvicini, G., Cinabro, D., Lincoln, A., Smith, M. J., Zhou, P., Zhu, J., Naik, P., Rademacker, J., Asner, D. M., Edwards, K. W., Randrianarivony, K., Tatishvili, G., Briere, R. A., Vogel, H., Onyisi, P. U. E., and Rosner, J. L.
Subjects: High Energy Physics - Experiment
Abstract: The decays of psi(2S) into gamma p bar{p}, pi^0 p bar{p} and eta p bar{p} have been studied with the CLEO-c detector using a sample of 24.5 million psi(2S) events obtained from e^+e^- annihilations at sqrt{s} = 3686 MeV. The data show evidence for the excitation of several N^* resonances in p pi^0 and p eta channels in pi^0 p bar{p} and eta p bar{p} decays, and f_2 states in gamma p bar{p} decay. Branching fractions for decays of psi(2S) to gamma p bar{p}, pi^0 p bar{p} and eta p bar{p} have been determined. No evidence for p bar{p} threshold enhancements was found in the reactions psi(2S)-> X p bar{p}, where X = gamma, pi^0, eta. We do, however, find confirming evidence for a p bar{p} threshold enhancement in J/psi-> gamma p bar{p} as previously reported by BES., Comment: 25 pages, 21 figures, accepted by PRD
Published: 2010
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22. Branching fractions for chi_cJ -> p p-bar pi^0, p p-bar eta, and p p-bar omega

Author: CLEO Collaboration, Onyisi, P. U. E., Rosner, J. L., Alexander, J. P., Cassel, D. G., Das, S., Ehrlich, R., Fields, L., Gibbons, L., Gray, S. W., Hartill, D. L., Heltsley, B. K., Hunt, J. M., Kreinick, D. L., Kuznetsov, V. E., Ledoux, J., Patterson, J. R., Peterson, D., Riley, D., Ryd, A., Sadoff, A. J., Shi, X., Sun, W. M., Yelton, J., Rubin, P., Lowrey, N., Mehrabyan, S., Selen, M., Wiss, J., Adams, S., Kornicer, M., Mitchell, R. E., Shepherd, M. R., Tarbert, C. M., Besson, D., Pedlar, T. K., Xavier, J., Cronin-Hennessy, D., Hietala, J., Zweber, P., Dobbs, S., Metreveli, Z., Seth, K. K., Xiao, T., Tomaradze, A., Brisbane, S., Libby, J., Martin, L., Powell, A., Spradlin, P., Wilkinson, G., Mendez, H., Ge, J. Y., Miller, D. H., Shipsey, I. P. J., Xin, B., Adams, G. S., Hu, D., Moziak, B., Napolitano, J., Ecklund, K. M., Insler, J., Muramatsu, H., Park, C. S., Thorndike, E. H., Yang, F., Ricciardi, S., Thomas, C., Artuso, M., Blusk, S., Mountain, R., Skwarnicki, T., Stone, S., Wang, J. C., Zhang, L. M., Bonvicini, G., Cinabro, D., Lincoln, A., Smith, M. J., Zhou, P., Zhu, J., Naik, P., Rademacker, J., Asner, D. M., Edwards, K. W., Reed, J., Randrianarivony, K., Robichaud, A. N., Tatishvili, G., White, E. J., Briere, R. A., and Vogel, H.
Subjects: High Energy Physics - Experiment
Abstract: Using a sample of 25.9 million psi(2S) decays acquired with the CLEO-c detector at the CESR e^+e^- collider, we report branching fractions for the decays chi_cJ -> p p-bar pi^0, p p-bar eta, and p p-bar omega, with J=0,1,2. Our results for B(chi_cJ-> p p-bar pi^0) and B(chi_cJ-> p p-bar eta) are consistent with, but more precise than, previous measurements. Furthermore, we include the first measurement of B(chi_cJ-> p p-bar omega)., Comment: 11 pages, 5 figures, available through http://www.lns.cornell.edu/public/CLNS/, submitted to PRD(R)
Published: 2010
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23. Analysis of D+ to K- pi+ e+ nu_e and D+ to K- pi+ mu+ nu_mu Semileptonic Decays

Author: CLEO Collaboration, Briere, R. A., Vogel, H., Onyisi, P. U. E., Rosner, J. L., Alexander, J. P., Cassel, D. G., Das, S., Ehrlich, R., Fields, L., Gibbons, L., Gray, S. W., Hartill, D. L., Heltsley, B. K., Hunt, J. M., Kreinick, D. L., Kuznetsov, V. E., Ledoux, J., Patterson, J. R., Peterson, D., Riley, D., Ryd, A., Sadoff, A. J., Shi, X., Sun, W. M., Yelton, J., Rubin, P., Lowrey, N., Mehrabyan, S., Selen, M., Wiss, J., Kornicer, M., Mitchell, R. E., Shepherd, M. R., Tarbert, C. M., Besson, D., Pedlar, T. K., Xavier, J., Cronin-Hennessy, D., Hietala, J., Zweber, P., Dobbs, S., Metreveli, Z., Seth, K. K., Ting, X., Tomaradze, A., Brisbane, S., Libby, J., Martin, L., Powell, A., Spradlin, P., Wilkinson, G., Mendez, H., Ge, J. Y., Miller, D. H., Shipsey, I. P. J., Xin, B., Adams, G. S., Hu, D., Moziak, B., Napolitano, J., Ecklund, K. M., Insler, J., Muramatsu, H., Park, C. S., Thorndike, E. H., Yang, F., Ricciardi, S., Thomas, C., Artuso, M., Blusk, S., Khalil, S., Mountain, R., Skwarnicki, T., Stone, S., Wang, J. C., Zhang, L. M., Bonvicini, G., Cinabro, D., Lincoln, A., Smith, M. J., Zhou, P., Zhu, J., Naik, P., Rademacker, J., Asner, D. M., Edwards, K. W., Reed, J., Randrianarivony, K., Robichaud, A. N., Tatishvili, G., and White, E. J.
Subjects: High Energy Physics - Experiment
Abstract: Using a large sample (~11800 events) of D^+ into K^- pi^+ e^+ nu_e and D^+ into K^- pi^+ mu^+ nu_mu decays collected by the CLEO-c detector running at the psi(3770), we measure the helicity basis form factors free from the assumptions of spectroscopic pole dominance and provide new, accurate measurements of the absolute branching fractions for D^+ into K^- pi^+ e^+ nu_e and D^+ into K^- pi^+ mu^+ nu_mu decays. We find branching fractions which are consistent with previous world averages. Our measured helicity basis form factors are consistent with the spectroscopic pole dominance predictions for the three main helicity basis form factors describing D^+ into anti-K*0 ell^+ nu_mu decay. The ability to analyze D^+ into K^- pi^+ mu^+ nu_mu allows us to make the first non-parametric measurements of the mass-suppressed form factor. Our result is inconsistent with existing Lattice QCD calculations. Finally, we measure the form factor that controls non-resonant s-wave interference with the D^+ into anti-K*0 ell^+ nu_mu amplitude and search for evidence of possible additional non-resonant d-wave or f-wave interference with the anti-K*0., Comment: We have made the replacement in order to make it clear that the branching fractions that we report are actually for D+ --> antiK*0 L+ nu decay. Hence, the branching fractions for D+ --> K+ pi L+ nu that we measure are corrected for the missing antiK*0 --> anti-K0 pi0 decay mode of the anti-K*0. We feel that this clarification is necessary.
Published: 2010
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24. Radiative pi0 photoproduction on protons in the Delta+(1232) region

Author: Schumann, S., Boillat, B., Downie, E. J., Aguar-Bartolomé, P., Ahrens, J., Annand, J. R. M., Arends, H. J., Beck, R., Bekrenev, V., Braghieri, A., Branford, D., Briscoe, W. J., Brudvik, J. W., Cherepnya, S., Codling, R., Drexler, P., Fil'kov, L. V., Glazier, D. I., Gregor, R., Heid, E., Hornidge, D., Jahn, O., Kashevarov, V. L., Kondratiev, R., Korolija, M., Kotulla, M., Krambrich, D., Krusche, B., Lang, M., Lisin, V., Livingston, K., Lugert, S., MacGregor, I. J. D., Manley, D. M., Martinez-Fabregate, M., McGeorge, J. C., Mekterovic, D., Metag, V., Nefkens, B. M. K., Nikolaev, A., Novotny, R., Ostrick, M., Owens, R. O., Pedroni, P., Polonski, A., Prakhov, S. N., Price, J. W., Rosner, G., Rost, M., Rostomyan, T., Sober, D., Starostin, A., Supek, I., Tarbert, C. M., Thomas, A., Unverzagt, M., Walcher, Th., Watts, D. P., and Zehr, F.
Subjects: High Energy Physics - Experiment
Abstract: The reaction gamma p -> p pi0 gamma' has been measured with the Crystal Ball / TAPS detectors using the energy-tagged photon beam at the electron accelerator facility MAMI-B. Energy and angular differential cross sections for the emitted photon gamma' and angular differential cross sections for the pi0 have been determined with high statistics in the energy range of the Delta+(1232) resonance. Cross sections and the ratio of the cross section to the non-radiative process gamma p -> p pi0 are compared to theoretical reaction models, having the anomalous magnetic moment kappa_Delta+ as free parameter. As the shape of the experimental distributions is not reproduced in detail by the model calculations, currently no extraction of kappa_Delta+ is feasible., Comment: 14 pages, 19 figures
Published: 2010
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25. Measurement of the eta_b(1S) mass and the branching fraction for Upsilon(3S) --> gamma eta_b(1S)

Author: The CLEO Collaboration, Bonvicini, G., Cinabro, D., Lincoln, A., Smith, M. J., Zhou, P., Zhu, J., Naik, P., Rademacker, J., Asner, D. M., Edwards, K. W., Reed, J., Robichaud, A. N., Tatishvili, G., White, E. J., Briere, R. A., Vogel, H., Onyisi, P. U. E., Rosner, J. L., Alexander, J. P., Cassel, D. G., Ehrlich, R., Fields, L., Galik, R. S., Gibbons, L., Gray, S. W., Hartill, D. L., Heltsley, B. K., Hunt, J. M., Kreinick, D. L., Kuznetsov, V. E., Ledoux, J., Mahlke-Krüger, H., Patterson, J. R., Peterson, D., Riley, D., Ryd, A., Sadoff, A. J., Shi, X., Stroiney, S., Sun, W. M., Yelton, J., Rubin, P., Lowrey, N., Mehrabyan, S., Selen, M., Wiss, J., Kornicer, M., Mitchell, R. E., Shepherd, M. R., Tarbert, C. M., Besson, D., Pedlar, T. K., Xavier, J., Cronin-Hennessy, D., Gao, K. Y., Hietala, J., Poling, R., Zweber, P., Dobbs, S., Metreveli, Z., Seth, K. K., Tan, B. J. Y., Tomaradze, A., Brisbane, S., Libby, J., Martin, L., Powell, A., Spradlin, P., Thomas, C., Wilkinson, G., Mendez, H., Ge, J. Y., Miller, D. H., Shipsey, I. P. J., Xin, B., Adams, G. S., Hu, D., Moziak, B., Napolitano, J., Ecklund, K. M., Insler, J., Muramatsu, H., Park, C. S., Thorndike, E. H., Yang, F., Artuso, M., Blusk, S., Khalil, S., Mountain, R., Randrianarivony, K., Skwarnicki, T., Wang, J. C., and Zhang, L. M.
Subjects: High Energy Physics - Experiment
Abstract: We report evidence for the ground state of bottomonium, eta_b(1S), in the radiative decay Upsilon(3S) --> gamma eta_b in e^+e^- annihilation data taken with the CLEO III detector. Using 6 million Upsilon(3S) decays, and assuming Gamma(eta_b) = 10 MeV/c^2, we obtain B(Upsilon(3S) --> gamma eta_b) = (7.1 +- 1.8 +- 1.1) X 10^{-4}, where the first error is statistical and the second is systematic. The statistical significance is about 4 sigma. The mass is determined to be M(eta_b) = 9391.8 +- 6.6 +- 2.0 MeV/c^2, which corresponds to the hyperfine splitting Delta M_{hf}(1S)_b = 68.5 +- 6.6 +- 2.0 MeV/c^2. Using 9 million Upsilon(2S) decays, we place an upper limit on the corresponding Y(2S) decay, B(Y(2S) --> gamma eta_b) < 8.4 X 10^{-4} at 90 % confidence level., Comment: 10 pages, 3 figures, accepted by Phyical Review D Rapid Communications
Published: 2009
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26. Beam-Helicity Asymmetries in Double Pion Photoproduction off the Proton

Author: Krambrich, D., Zehr, F., Fix, A., Roca, L., Aguar, P., Ahrens, J., Annand, J. R. M., Arends, H. J., Beck, R., Bekrenev, V., Boillat, B., Braghieri, A., Branford, D., Briscoe, W. J., Brudvik, J., Cherepnya, S., Codling, R., Downie, E. J., Dexler, P., Glazier, D. I., Grabmayr, P., Gregor, R., Heid, E., Hornidge, D., Jahn, O., Kashevarov, V. L., Knezevic, A., Kondratiev, R., Korolija, M., Kotulla, M., Krusche, B., Kulbardis, A., Lang, M., Lisin, V., Livingston, K., Lugert, S., MacGregor, I. J. D., Manley, D. M., Martinez, M., McGeorge, J. C., Mekterovic, D., Metag, V., Nefkens, B. M. K., Nikolaev, A., Pedroni, P., Pheron, F., Polonski, A., Prakhov, S. N., Price, J. W., Rosner, G., Rost, M., Rostomyan, T., Schumann, S., Sober, D., Starostin, A., Supek, I., Tarbert, C. M., Thomas, A., Unverzagt, M., Walcher, Th., and Watts, D. P.
Subjects: Nuclear Experiment
Abstract: Beam-helicity asymmetries have been measured at the MAMI accelerator in Mainz in the three isospin channels $\vec{\gamma}p\to \pi^{+}\pi^0n$, $\vec{\gamma}p\to \pi^{0}\pi^0p$ and $\vec{\gamma}p\to \pi^{+}\pi^{-}p$ . The circularly polarized photons, produced from bremsstrahlung of longitudinally polarized electrons, were tagged with the Glasgow magnetic spectrometer. Charged pions and the decay photons of $\pi^0$ mesons were detected in a $~4\pi$ electromagnetic calorimeter which combined the Crystal Ball detector with the TAPS detector. The precisely measured asymmetries are very sensitive to details of the production processes and are thus key observables in the modeling of the reaction dynamics., Comment: accepted for publication in Phys. Rev. Lett
Published: 2009
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27. Photoproduction of pi^0 eta on protons and the Delta(1700)D_{33} resonance

Author: Kashevarov, V. L., Fix, A., Aguar-Bartolome, P., Akasoy, L. K., Annand, J. R. M., Arends, H. J., Bantawa, K., Beck, R., Bekrenev, V., Berghauser, H., Boillat, B., Braghieri, A., Branford, D., Briscoe, W. J., Brudvik, J., Cherepnya, S., Downie, E. J., Drexler, P., Fil'kov, L. V., Glazier, D. I., Gregor, R., Heid, E., Hornidge, D., Jahn, O., Jude, T. C., Knezevic, A., Kondratiev, R., Korolija, M., Kotulla, M., Koulbardis, A., Kruglov, S., Krusche, B., Lisin, V., Livingston, K., MacGregor, I. J. D., Maghrbi, Y., Manley, D. M., Martinez-Fabregate, M., McGeorge, J. C., McNicoll, E. F., Mekterovic, D., Metag, V., Micanovic, S., Nefkens, B. M. K., Nikolaev, A., Novotny, R., Ostrick, M., Owens, R. O., Pedroni, P., Pheron, F., Polonski, A., Robinson, J., Prakhov, S. N., Rosner, G., Rostomyan, T., Schumann, S., Sober, D., Starostin, A., Suarez, I. M., Supek, I., Tarbert, C. M., Thiel, M., Thomas, A., Unverzagt, M., Watts, D. P., Zamboni, I., and Zehr, F.
Subjects: High Energy Physics - Experiment
Abstract: Total and differential cross sections for the reaction gamma p -> pi^o eta p have been measured with the Crystal Ball/TAPS detector using the tagged photon facility at the MAMI C accelerator in Mainz. In the energy range E_gamma=0.95-1.4 GeV the reaction is dominated by the excitation and sequential decay of the Delta(1700)D33 resonance. Angular distributions measured with high statistics allow us to determine the ratio of hadronic decay widths \Gamma_{\eta \Delta}/\Gamma_{\pi S11} and the ratio of the helicity amplitudes A_{3/2}/A_{1/2} for this resonance., Comment: 9 pages, 11 figures
Published: 2009
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28. Determination of the Dalitz plot parameter alpha for the decay eta->3pi^0 with the Crystal Ball at MAMI-B

Author: Unverzagt, M., Aguar-Bartolome, P., Ahrens, J., Annand, J. R. M., Arends, H. J., Beck, R., Bekrenev, V., Boillat, B., Braghieri, A., Branford, D., Briscoe, W. J., Brudvik, J. W., Cherepnya, S., Codling, R., Downie, E. J., Filkov, L. V., Glazier, D. I., Gregor, R., Heid, E., Hornidge, D., Jahn, O., Kashevarov, V. L., Kondratiev, R., Korolija, M., Kotulla, M., Krambrich, D., Krusche, B., Lang, M., Lisin, V., Livingston, K., Lugert, S., MacGregor, I. J. D., Manley, D. M., Martinez-Fabregate, M., McGeorge, J. C., Mekterovic, D., Metag, V., Nefkens, B. M. K., Nikolaev, A., Novotny, R., Owens, R. O., Pedroni, P., Polonski, A., Prakhov, S. N., Price, J. W., Rosner, G., Rost, M., Rostomyan, T., Schumann, S., Sober, D., Starostin, A., Supek, I., Tarbert, C. M., Thomas, A., Walcher, Th., Watts, D. P., and Zehr, F.
Subjects: High Energy Physics - Experiment
Abstract: A precise measurement of the Dalitz plot parameter, alpha, for the eta->3pi^0 decay is presented. The experiment was performed with the Crystal Ball and TAPS large acceptance photon detectors at the tagged photon beam facility of the MAMI-B electron accelerator in Mainz. High statistics of 1.8*10^6 eta->3pi^0 events were obtained, giving the result alpha = -0.032 +/- 0.002(stat) +/- 0.002(syst)., Comment: 9 pages, 6 figures, published in the online-first section of EPJ A, included changes referees asked for, added DOI
Published: 2008
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29. Measurement of the Slope Parameter $\alpha$ for the $\eta\to 3\pi^0$ decay with the Crystal Ball detector at the Mainz Microtron (MAMI-C)

Author: Prakhov, S., Nefkens, B. M. K., Aguar-Bartolome, P., Akasoy, L. K., Annand, J. R. M., Arends, H. J., Bantawa, K., Beck, R., Bekrenev, V., Berghauser, H., Boillat, B., Braghieri, A., Branford, D., Briscoe, W. J., Brudvik, J., Cherepnya, S., Codling, R. F. B., Downie, E. J., Drexler, P., Fil'kov, L. V., Glazier, D. I., Gregor, R., Heid, E., Hornidge, D., Jahn, O., Jude, T. C., Kashevarov, V. L., Kellie, J. D., Kondratiev, R., Korolija, M., Kotulla, M., Koulbardis, A., Krambrich, D., Kruglov, S., Krusche, B., Lang, M., Lisin, V., Livingston, K., MacGregor, I. J. D., Maghrbi, Y., Manley, D. M., Martinez, M., McGeorge, J. C., McNicoll, E. F., Mekterovic, D., Metag, V., Micanovic, S., Nikolaev, A., Novotny, R., Ostrick, M., Otte, P. B., Pedroni, P., Pheron, F., Polonski, A., Robinson, J., Rosner, G., Rost, M., Rostomyan, T., Schumann, S., Sikora, M. H., Sober, D. I., Starostin, A., Suarez, I. M., Supek, I., Tarbert, C. M., Thiel, M., Thomas, A., Unverzagt, M., Watts, D. P., Zamboni, I., and Zehr, F.
Subjects: High Energy Physics - Experiment
Abstract: The dynamics of the $\eta\to 3\pi^0$ decay have been studied with the Crystal Ball multiphoton spectrometer and the TAPS calorimeter. Bremsstrahlung photons produced by the 1.5-GeV electron beam of the Mainz microtron MAMI-C and tagged by the Glasgow photon spectrometer were used for $\eta$-meson production. The analysis of $3 \times 10^6$ $\gamma p \to \eta p \to 3\pi^0 p \to 6\gamma p$ events yields the value $\alpha=-0.032\pm0.003$ for the $\eta\to 3\pi^0$ slope parameter, which agrees with the majority of recent experimental results and has the smallest uncertainty. The $\pi^0\pi^0$ invariant-mass spectrum was investigated for the occurrence of a cusplike structure in the vicinity of the $\pi^+\pi^-$ threshold. The observed effect is small and does not affect our measured value for the slope parameter.
Published: 2008
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30. Incoherent pion photoproduction on $^{12}$C

Author: Tarbert, C. M., Watts, D. P., Aguar, P., Ahrens, J., Annand, J. R. M., Arends, H. J., Beck, R., Bekrenev, V., Boillat, B., Braghieri, A., Branford, D., Briscoe, W. J., Brudvik, J., Cherepnya, S., Codling, R., Downie, E. J., Foehl, K., Glazier, D. I., Grabmayr, P., Gregor, R., Heid, E., Hornidge, D., Jahn, O., Kashevarov, V. L., Knezevic, A., Kondratiev, R., Korolija, M., Kotulla, M., Krambrich, D., Krusche, B., Lang, M., Lisin, V., Livingston, K., Lugert, S., MacGregor, I. J. D., Manley, D. M., Martinez, M., McGeorge, J. C., Mekterovic, D., Metag, V., Nefkens, B. M. K., Nikolaev, A., Novotny, R., Owens, R. O., Pedroni, P., Polonski, A., Prakhov, S. N., Price, J. W., Rosner, G., Rost, M., Rostomyan, T., Schadmand, S., Schumann, S., Sober, D., Starostin, A., Supek, I., Thomas, A., Unverzagt, M., Walcher, Th., and Zehr, F.
Subjects: Nuclear Experiment
Abstract: We present the first detailed measurement of incoherent photoproduction of neutral pions to a discrete state of a residual nucleus. The $^{12}$C$(\gamma,\pi^{0})^{12}$C$^{*}_{4.4MeV}$ reaction has been studied with the Glasgow photon tagger at MAMI employing a new technique which uses the large solid angle Crystal Ball detector both as a $\pi^{0}$ spectrometer and to detect decay photons from the excited residual nucleus. The technique has potential applications to a broad range of future nuclear measurements with the Crystal Ball and similar detector systems elsewhere. The data are sensitive to the propagation of the $\Delta$ in the nuclear medium and will give the first information on matter transition form factors from measurements with an electromagnetic probe. The incoherent cross sections are compared to two theoretical predictions including a $\Delta$-hole model., Comment: 4 pages, 8 figures, submitted to Physical Review Letters
Published: 2007
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31. Determination of the $ \eta$ mass with the Crystal Ball at MAMI-B

Author: Nikolaev, A., Aguar-Bartolomé, P., Ahrens, J., Annand, J. R. M., Arends, H. J., Beck, R., Bekrenev, V., Boillat, B., Braghieri, A., Branford, D., Briscoe, W. J., Brudvik, J. W., Cherepnya, S., Codling, R., Dehn, M., Downie, E. J., Fil’kov, L. V., Glazier, D. I., Gregor, R., Heid, E., Hornidge, D., Jahn, O., Jankowiak, A., Kaiser, K. -H., Kashevarov, V. L., Kondratiev, R., Korolija, M., Kotulla, M., Krambrich, D., Krusche, B., Lang, M., Lisin, V., Livingston, K., Ludwig-Mertin, U., Lugert, S., MacGregor, I. J. D., Manley, D. M., Martinez-Fabregate, M., McGeorge, J. C., Mekterovic, D., Metag, V., Nefkens, B. M. K., Novotny, R., Owens, R. O., Pedroni, P., Polonski, A., Prakhov, S. N., Price, J. W., Reiter, A., Rosner, G., Rost, M., Rostomyan, T., Schumann, S., Sober, D., Starostin, A., Supek, I., Tarbert, C. M., Thomas, A., Unverzagt, M., Walcher, Th., Watts, D. P., Zehr, F., and The Crystal Ball at MAMI, TAPS and A2 Collaborations
Published: 2014
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32. Measurements of 12C$E_{\gamma}=200$–450 MeV

Author: Robinson, J., MacGregor, I. J. D., Annand, J. R. M., Aguar-Bartolomé, P., Akasoy, L. K., Arends, H. J., Azimov, Ya. I., Bantawa, K., Beck, R., Bekrenev, V. S., Berghäuser, H., Braghieri, A., Branford, D., Briscoe, W. J., Brudvik, J., Cherepnya, S., Codling, R. F. B., Demissie, B. T., Dieterle, M., Downie, E. J., Drexler, P., Fil’kov, L. V., Glazier, D. I., Gregor, R., Hamilton, D., Heid, E., Hornidge, D., Howdle, D., Jahn, O., Jude, T. C., Kashevarov, V. L., Keshelashvili, I., Kondratiev, R., Korolija, M., Kotulla, M., Koulbardis, A. A., Kruglov, S. P., Krusche, B., Lisin, V., Livingston, K., Manley, D. M., McGeorge, J. C., McNicoll, E. F., Metag, V., Middleton, D. G., Mushkarenkov, A., Nefkens, B. M. K., Nikolaev, A., Novotny, R., Oberle, M., Ostrick, M., Owens, R. O., Otte, P. B., Oussena, B., Pedroni, P., Polonski, A., Prakhov, S., Rosner, G., Rostomyan, T., Schumann, S., Sikora, M. H., Sober, D. I., Starostin, A., Strakovsky, I. I., Suarez, I. M., Supek, I., Tarbert, C. M., Thiel, M., Thomas, A., Unverzagt, M., Watts, D. P., Werthmueller, D., Witthauer, L., and The Crystal Ball at MAMI and A2 Collaborations
Published: 2013
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33. Determination of the Dalitz plot parameter $ \pi^{0}_{}$ with the Crystal Ball at MAMI-B

Author: Unverzagt, M., Aguar-Bartolomé, P., Ahrens, J., Annand, J. R. M., Arends, H. J., Beck, R., Bekrenev, V., Boillat, B., Braghieri, A., Branford, D., Briscoe, W. J., Brudvik, J. W., Cherepnya, S., Codling, R., Downie, E. J., Fil’kov, L. V., Glazier, D. I., Gregor, R., Heid, E., Hornidge, D., Jahn, O., Kashevarov, V. L., Kondratiev, R., Korolija, M., Kotulla, M., Krambrich, D., Krusche, B., Lang, M., Lisin, V., Livingston, K., Lugert, S., MacGregor, I. J. D., Manley, D. M., Martinez-Fabregate, M., McGeorge, J. C., Mekterovic, D., Metag, V., Nefkens, B. M. K., Nikolaev, A., Novotny, R., Owens, R. O., Pedroni, P., Polonski, A., Prakhov, S. N., Price, J. W., Rosner, G., Rost, M., Rostomyan, T., Schumann, S., Sober, D., Starostin, A., Supek, I., Tarbert, C. M., Thomas, A., Walcher, Th., Watts, D. P., Zehr, F., and Crystal Ball at MAMI, TAPS and A2 Collaborations
Published: 2009
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34. Photon asymmetry measurements of γ→ p→ π0p for Eγ= 320-650 MeV

Author: Gardner, S., Howdle, D., Sikora, M. H., Wunderlich, Y., Abt, S., Achenbach, P., Afzal, F., Aguar-Bartolome, P., Ahmed, Z., Annand, J. R.M., Arends, H. J., Bantawa, K., Bashkanov, M., Beck, R., Biroth, M., Borisov, N. S., Braghieri, A., Briscoe, W. J., Cherepnya, S., Cividini, F., Costanza, S., Collicott, C., Demissie, B. T., Denig, A., Dieterle, M., Downie, E. J., Drexler, P., Ferretti-Bondy, M. I., Filkov, L. V., Glazier, D. I., Garni, S., Gradl, W., Günther, M., Gurevich, G. M., Hall Barrientos, P., Hamilton, D., Heid, E., Hornidge, D., Huber, G. M., Jahn, O., Jude, T. C., Käser, A., Kay, S., Kashevarov, V. L., Keshelashvili, I., Kondratiev, R., Korolija, M., Krusche, B., Linturi, J. M., Lisin, V., Livingston, K., Lutterer, S., MacGregor, I. J.D., Macrae, R., Mancell, J., Manley, D. M., Martel, P. P., McGeorge, J. C., McNicoll, E. F., Middleton, D. G., Miskimen, R., Mullen, C., Mushkarenkov, A., Neganov, A. B., Neiser, A., Nikolaev, A., Oberle, M., Ostrick, M., Owens, R. O., Otte, P. B., Oussena, B., Paudyal, D., Pedroni, P., Polonski, A., Prakhov, S., Rajabi, A., Rosner, G., Rostomyan, T., Sarty, A., Schumann, S., Sokhoyan, V., Spieker, K., Steffen, O., Sfienti, C., Strakovsky, I. I., Strandberg, B., Strub, Th, Supek, I., Tarbert, C. M., Thiel, A., Thiel, M., Unverzagt, M., Usov, Yu A., Watts, D. P., Werthmüller, D., Wettig, J., Wolfes, M., Witthauer, L., and Zana, L.
Subjects: Nuclear Experiment
Abstract: High-statistics measurements of the photon asymmetry Σ for the γ→ p→ π0p reaction have been made in the center-of-mass energy range W= 1214 - 1450 MeV. The data were measured with the MAMI A2 real photon beam and Crystal Ball/TAPS detector systems in Mainz, Germany. The results significantly improve the existing world data and are shown to be in good agreement with previous measurements, and with the MAID, SAID, and Bonn-Gatchina predictions. We have also combined the photon asymmetry results with recent cross-section measurements from Mainz to calculate the profile functions, Σˇ (= σ0Σ) , and perform a moment analysis. Comparison with calculations from the Bonn-Gatchina model shows that the precision of the data is good enough to further constrain the higher partial waves, and there is an indication of interference between the very small F-waves and the N(1520) 3 / 2 - and N(1535) 1 / 2 - resonances.
Published: 2016

35. Photon asymmetry measurements of $\overrightarrow�� \mathrm{p} \rightarrow ��^{0} \mathrm{p}$ for E$_��$=320$-$650 MeV

Author: Gardner, S., Howdle, D., Sikora, M. H., Wunderlich, Y., Abt, S., Achenbach, P., Afzal, F., Aguar-Bartolome, P., Ahmed, Z., Annand, J. R. M., Arends, H. J., Bantawa, K., Bashkanov, M., Beck, R., Biroth, M., Borisov, N. S., Braghieri, A., Briscoe, W. J., Cherepnya, S., Cividini, F., Costanza, S., Collicott, C., Demissie, B. T., Denig, A., Dieterle, M., Downie, E. J., Drexler, P., Ferretti-Bondy, M. I., Filkov, L. V., Glazier, D. I., Garni, S., Gradl, W., G��nther, M., Gurevich, G. M., Hamilton, D., Heid, E., Hornidge, D., Huber, G. M., Jahn, O., Jude, T. C., K��ser, A., Kay, S., Kashevarov, V. L., Keshelashvili, I., Kondratiev, R., Korolija, M., Krusche, B., Linturi, J. M., Lisin, V., Livingston, K., Lutterer, S., MacGregor, I. J. D., Macrae, R., Mancell, J., Manley, D. M., Martel, P. P., McGeorge, J. C., McNicoll, E. F., Middleton, D. G., Miskimen, R., Mullen, C., Mushkarenkov, A., Neganov, A. B., Neiser, A., Nikolaev, A., Oberle, M., Ostrick, M., Owens, R. O., Otte, P. B., Oussena, B., Paudyal, D., Pedroni, P., Polonski, A., Prakhov, S., Rajabi, A., Robinson, J., Rosner, G., Rostomyan, T., Sarty, A., Schumann, S., Sokhoyan, V., Spieker, K., Steffen, O., Sfienti, C., Strakovsky, I. I., Strandberg, B., Strub, Th., Supek, I., Tarbert, C. M., Thiel, A., Thiel, M., Thomas, A., Unverzagt, M., Usov, Yu. A., Watts, D. P., Werthm��ller, D., Wettig, J., Wolfes, M., Witthauer, L., and Zana, L.
Subjects: FOS: Physical sciences, Nuclear Experiment (nucl-ex), Nuclear Experiment
Abstract: High statistics measurements of the photon asymmetry $\mathrm��$ for the $\overrightarrow��$p$\rightarrow��^{0}$p reaction have been made in the center of mass energy range W=1214-1450 MeV. The data were measured with the MAMI A2 real photon beam and Crystal Ball/TAPS detector systems in Mainz, Germany. The results significantly improve the existing world data and are shown to be in good agreement with previous measurements, and with the MAID, SAID, and Bonn-Gatchina predictions. We have also combined the photon asymmetry results with recent cross-section measurements from Mainz to calculate the profile functions, $\check{\mathrm��}$ (= $��_{0}\mathrm��$), and perform a moment analysis. Comparison with calculations from the Bonn-Gatchina model shows that the precision of the data is good enough to further constrain the higher partial waves, and there is an indication of interference between the very small $F$-waves and the $N(1520) 3/2^{-}$ and $N(1535) 1/2^{-}$ resonances.
Published: 2016
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36. Photoproduction of the ωmeson on the proton near threshold

Author: Strakovsky, I. I., Prakhov, S., Azimov, Ya. I., Aguar-Bartolomé, P., Annand, J. R. M., Arends, H. J., Bantawa, K., Beck, R., Bekrenev, V., Berghäuser, H., Braghieri, A., Briscoe, W. J., Brudvik, J., Cherepnya, S., Codling, R. F. B., Collicott, C., Costanza, S., Demissie, B. T., Downie, E. J., Drexler, P., Fil'kov, L. V., Glazier, D. I., Gregor, R., Hamilton, D. J., Heid, E., Hornidge, D., Jaegle, I., Jahn, O., Jude, T. C., Kashevarov, V. L., Keshelashvili, I., Kondratiev, R., Korolija, M., Kotulla, M., Koulbardis, A., Kruglov, S., Krusche, B., Lisin, V., Livingston, K., MacGregor, I. J. D., Maghrbi, Y., Manley, D. M., Marinides, Z., McGeorge, J. C., McNicoll, E. F., Mekterovic, D., Metag, V., Middleton, D. G., Mushkarenkov, A., Nefkens, B. M. K., Nikolaev, A., Novotny, R., Ortega, H., Ostrick, M., Otte, P. B., Oussena, B., Pedroni, P., Pheron, F., Polonski, A., Robinson, J., Rosner, G., Rostomyan, T., Schumann, S., Sikora, M. H., Starostin, A., Supek, I., Taragin, M. F., Tarbert, C. M., Thiel, M., Thomas, A., Unverzagt, M., Watts, D. P., Werthmüller, D., and Zehr, F.
Subjects: Nuclear Experiment
Abstract: An experimental study of ω photoproduction on the proton was conducted by using the Crystal Ball and TAPS multiphoton spectrometers together with the photon tagging facility at the Mainz Microtron MAMI. The γp→ωp differential cross sections are measured from threshold to the incident-photon energy Eγ=1.40 GeV (W=1.87 GeV for the center-of-mass energy) with 15-MeV binning in Eγ and full production-angle coverage. The quality of the present data near threshold gives access to a variety of interesting physics aspects. As an example, an estimation of the ωN scattering length αωp is provided.
Published: 2015

37. Photometric Compliance of Tablet Screens and Retro-Illuminated Acuity Charts As Visual Acuity Measurement Devices

Author: Livingstone, I. A. T., primary, Tarbert, C. M., additional, Giardini, M. E., additional, Bastawrous, A., additional, Middleton, D., additional, and Hamilton, R., additional
Published: 2016
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38. Coherent photoproduction of π0- and η-mesons off 7Li

Author: Maghrbi, Y., Krusche, B., Ahrens, J., Annand, J. R. M., Arends, H. J., Beck, R., Bekrenev, V., Boillat, B., Braghieri, A., Branford, D., Briscoe, W. J., Brudvik, J., Cherepnya, S., Codling, R. F. B., Downie, E. J., Drexler, P., Fil’kov, L. V., Fix, A., Glazier, D. I., Gregor, R., Heid, E., Hornidge, D., Jaegle, I., Jahn, O., Kashevarov, V. L., Keshelashvili, I., Knezevic, A., Kondratiev, R., Korolija, M., Krambrich, D., Lang, M., Lisin, V., Livingston, K., Lugert, S., MacGregor, I. J. D., Manley, D. M., Martinez, M., McGeorge, J. C., Mekterovic, D., Metag, V., Nefkens, B. M. K., Nikolaev, A., Novotny, R., Ostrick, M., Pedroni, P., Pheron, F., Polonski, A., Prakhov, S., Price, J. W., Rosner, G., Rost, M., Rostomyan, T., Schadmand, S., Schumann, S., Sober, D., Starostin, A., Supek, I., Tarbert, C. M., Thomas, A., Unverzagt, M., Watts, D. P., Werthmüller, D., and Zehr, F.
Subjects: Nuclear Theory, Nuclear Experiment
Abstract: Coherent photoproduction of π0-mesons from threshold (E th ≈ 136 MeV) throughout the Δ-resonance region and of η-mesons close to the production threshold (E th ≈ 570 MeV for η has been measured for 7Li nuclei. The experiment was performed using the tagged-photon beam of the Mainz MAMI accelerator with the Crystal Ball and TAPS detectors combined to give an almost 4π solid-angle electromagnetic calorimeter. The reactions were identified by a combined invariant-mass and missing-energy analysis. A comparison of the pion data to plane-wave impulse modelling tests the nuclear mass form factor. So far coherent η production had been only identified for the lightest nuclear systems (2H and 3He . For 3He a large enhancement of the cross section above plane-wave approximations had been reported, indicating the formation of a quasi-bound state. The present Li data for η production agree with a plane-wave approximation. Contrary to 3He , neither a threshold enhancement of the total cross section nor a deviation of the angular distributions from the expected form factor dependence were observed
Published: 2013

39. A new determination of the eta transition form factor in the Dalitz decay eta -> e^+ e^- gamma with the Crystal Ball/TAPS detectors at the Mainz Microtron

Author: Aguar-Bartolom��, P., Annand, J. R. M., Arends, H. J., Bantawa, K., Beck, R., Bekrenev, V., Bergh��user, H., Braghieri, A., Briscoe, W. J., Brudvik, J., Cherepnya, S., Codling, R. F. B., Collicott, C., Costanza, S., Denig, A., Downie, E. J., Drexler, P., Fil'kov, L. V., Fix, A., Glazier, D. I., Gregor, R., Hamilton, D. J., Heid, E., Hornidge, D., Isaksson, L., Jaegle, I., Jahn, O., Jude, T. C., Kashevarov, V. L., Keshelashvili, I., Kondratiev, R., Korolija, M., Kotulla, M., Koulbardis, A., Kruglov, S., Krusche, B., Lisin, V., Livingston, K., MacGregor, I. J. D., Maghrbi, Y., Manley, D. M., Masjuan, P., McGeorge, J. C., McNicoll, E. F., Mekterovic, D., Metag, V., Mushkarenkov, A., Nefkens, B. M. K., Nikolaev, A., Novotny, R., Ortega, H., Ostrick, M., Ott, P., Otte, P. B., Oussena, B., Pedroni, P., Pheron, F., Polonski, A., Prakhov, S., Robinson, J., Rosner, G., Rostomyan, T., Schumann, S., Sikora, M. H., Sober, D. I., Starostin, A., Strakovsky, I. I., Suarez, I. M., Supek, I., Tarbert, C. M., Thiel, M., Thomas, A., Unverzagt, M., Watts, D. P., Werthm��ller, D., and Zehr., F.
Subjects: High Energy Physics - Experiment (hep-ex), FOS: Physical sciences, High Energy Physics::Experiment, Nuclear Experiment (nucl-ex), Nuclear Experiment
Abstract: The Dalitz decay eta -> e^+ e^- gamma has been measured in the gamma p -> eta p reaction with the Crystal Ball and TAPS multiphoton spectrometers, together with the photon tagging facility at the Mainz Microtron MAMI. The experimental statistic used in this work is one order of magnitude greater than in any previous measurement of eta -> e^+ e^- gamma. The value obtained for the slope parameter 1/Lambda^2 of the eta transition form factor, 1/Lambda^2 = (1.95 +/- 0.15_stat +/- 0.10_syst) [1/GeV^2], is in good agreement with recent measurements conducted in eta -> e^+ e^- gamma and eta -> mu^+ mu^- gamma decays, as well as with recent form-factor calculations. The uncertainty obtained in the value of 1/Lambda^2 is lower compared to results from previous measurements of the eta -> e^+ e^- gamma decay., 11 pages, 10 figures, 1 table
Published: 2013
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40. Measurement of the g p -> K^0 Sigma^+ reaction with the Crystal Ball/TAPS detectors at the Mainz Microtron

Author: Aguar-Bartolom��, P., Annand, J. R. M., Arends, H. J., Bantawa, K., Beck, R., Bekrenev, V., Bergh��user, H., Braghieri, A., Briscoe, W. J., Brudvik, J., Cherepnya, S., Codling, R. F. B., Collicott, C., Demissie, B., Dieterle, M., Downie, E. J., Drexler, P., Fil'kov, L. V., Fix, A., Glazier, D. I., Gregor, R., Hamilton, D., Heid, E., Hornidge, D., Howdle, D., Isaksson, L., Jaegle, I., Jahn, O., Jude, T. C., Kashevarov, V. L., Keshelashvili, I., Kondratiev, R., Korolija, M., Kotulla, M., Koulbardis, A., Kruglov, S., Krusche, B., Lisin, V., Livingston, K., MacGregor, I. J. D., Maghrbi, Y., Mancel, J., Manley, D. M., McNicoll, E. F., Mekterovic, D., Metag, V., Mushkarenkov, A., Nefkens, B. M. K., Nikolaev, A., Novotny, R., Oberle, M., Ortega, H., Ostrick, M., Ott, P., Otte, P. B., Oussena, B., Pedroni, P., Pheron, F., Polonski, A., Prakhov, S., Robinson, J., Rosner, G., Rostomyan, T., Schumann, S., Sikora, M. H., Sober, D. I., Starostin, A., Strakovsky, I. I., Suarez, I. M., Supek, I., Tarbert, C. M., Thiel, M., Thomas, A., Unverzagt, M., Watts, D. P., Werthm��ller, D., Witthauer, L., and Zehr., F.
Subjects: High Energy Physics - Experiment (hep-ex), FOS: Physical sciences, Nuclear Experiment (nucl-ex)
Abstract: The g p -> K^0 Sigma^+ reaction has been measured from threshold to Eg=1.45 GeV (W_cm=1.9 GeV) using the Crystal Ball and TAPS multiphoton spectrometers together with the photon tagging facility at the Mainz Microtron MAMI. In the present experiment, this reaction was searched for in the 3pi^0 p final state, by assuming K^0_S -> pi^0 pi^0 and Sigma^+ -> pi^0 p. The experimental results include total and differential cross sections as well as the polarization of the recoil hyperon. The new data significantly improve empirical knowledge about the g p -> K^0 Sigma^+ reaction in the measured energy range. The results are compared to previous measurements and model predictions. It is demonstrated that adding the present g p -> K^0 Sigma^+ results to existing data allowed a better description of this reaction with various models., 12 pages, 10 figures, 4 tables
Published: 2013
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41. Determination of the �� mass with the Crystal Ball at MAMI-B

Author: Nikolaev, A., Aguar-Bartolom��, P., Ahrens, J., Annand, J. R. M., Arends, H. J., Beck, R., Bekrenev, V., Boillat, B., Braghieri, A., Branford, D., Briscoe, W. J., Brudvik, J. W., Cherepnya, S., Codling, R., Dehn, M., Downie, E. J., Fil'kov, L. V., Glazier, D. I., Gregor, R., Heid, E., Hornidge, D., Jahn, O., Jankowiak, A., Kaiser, K. -H., Kashevarov, V. L., Kondratiev, R., Korolija, M., Kotulla, M., Krambrich, D., Krusche, B., Lang, M., Lisin, V., Livingston, K., Ludwig-Mertin, U., Lugert, S., MacGregor, I. J. D., Manley, D. M., Martinez-Fabregate, M., McGeorge, J. C., Mekterovic, D., Metag, V., Nefkens, B. M. K., Novotny, R., Owens, R. O., Pedroni, P., Polonski, A., Prakhov, S. N., Price, J. W., Reiter, A., Rosner, G., Rost, M., Rostomyan, T., Schumann, S., Sober, D., Starostin, A., Supek, I., Tarbert, C. M., Thomas, A., Unverzagt, M., Walcher, Th., Watts, D. P., and Zehr, F.
Subjects: FOS: Physical sciences, High Energy Physics::Experiment, Nuclear Experiment (nucl-ex), Nuclear Experiment
Abstract: A new precise determination of the �� meson mass is presented. It is based on a measurement of the threshold for the ��p -> p�� reaction using the tagger focal-plane microscope detector at the MAMI-B facility in Mainz. The tagger microscope has a higher energy resolution than the standard tagging spectrometer and, hence, allowed an improvement in the accuracy compared to the previous �� mass measurement at MAMI-B. The result m�� = (547.851 +- 0.031 stat. +- 0.062 syst.) MeV agrees very well with the precise values of the NA48, KLOE and CLEO collaborations and deviates by about 5�� from the smaller, but also very precise value obtained by the GEM collaboration at COSY., Submitted for publication in EPJA
Published: 2012
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42. Measurements of branching fractions for electromagnetic transitions involving the chi(bJ)(1P) states

Author: Kornicer, M., Mitchell, R. E., Tarbert, C. M., Besson, D., Pedlar, T. K., Cronin-Hennessy, D., Hietala, J., Zweber, P., Dobbs, S., Metreveli, Z., Seth, K. K., Tomaradze, A., Xiao, T., Brisbane, S., Martin, L., Powell, A., Spradlin, P., Wilkinson, G., Mendez, H., Ge, J. Y., Miller, D. H., Shipsey, I. P. J., Xin, B., Adams, G. S., Hu, D., Moziak, B., Napolitano, J., Ecklund, K. M., Insler, J., Muramatsu, H., Park, C. S., Pearson, L. J., Thorndike, E. H., Yang, F., Ricciardi, S., Thomas, C., Artuso, M., Blusk, S., Mountain, R., Skwarnicki, T., Stone, S., Wang, J. C., Zhang, L. M., Bonvicini, G., Cinabro, D., Lincoln, A., Smith, M. J., Zhou, P., Zhu, J., Naik, P., Rademacker, J., Asner, D. M., Edwards, K. W., Randrianarivony, K., Tatishvili, G., Briere, R. A., Vogel, H., Onyisi, P. U. E., Rosner, J. L., Alexander, J. P., Cassel, D. G., Das, S., Ehrlich, R., Fields, L., Gibbons, L., Gray, S. W., Hartill, D. L., Heltsley, B. K., Kreinick, D. L., Kuznetsov, V. E., Patterson, J. R., Peterson, D., Riley, D., Ryd, A., Sadoff, A. J., Shi, X., Sun, W. M., Yelton, J., Rubin, P., Lowrey, N., Mehrabyan, S., Selen, M., Wiss, J., and Libby, J.
Abstract: Using (9.32, 5.88) million Y(2S; 3S) decays taken with the CLEO III detector, we obtain five product branching fractions for the exclusive processes Y(2S) -> gamma chi(b0,1,2)(1P) -> gamma gamma Y(1S) and Y(3S) -> gamma chi(b1,2)(1P) -> gamma gamma Y(1S). We observe the transition chi(b0)(1P) -> yY(1S) for the first time. Using the known branching fractions for B[Y2S) -> gamma chi(bJ)(1P)], we extract values for B[chi(bJ)(1P) -> gamma Y(1S)] for J = 0, 1, 2. In turn, these values can be used to unfold the Y(3S) product branching fractions to obtain values for B[Y(3S) -> gamma chi(b1,2)(1P)] for the first time individually. Comparison of these with each other and with the branching fraction B[Y(3S) -> gamma chi(b0)] previously measured by CLEO provides tests of relativistic corrections to electric dipole matrix elements.
Published: 2011

43. Determination of the eta-transition form factor in the gamma p -< p eta -< p gamma e(+)e(-) reaction

Author: Berghaeuser, H., Metag, V., Starostin, A., Bartolome, P. Aguar, Akasoy, L. K., Annand, J. R. M., Arends, H. J., Bantawa, K., Beck, R., Bekrenev, V., Braghieri, A., Branford, D., Briscoe, W. J., Brudvik, J., Cherepnya, S., Demissie, B. T., Downie, E. J., Drexler, P., Dieterle, M., Fil`kov, L. V., Fix, A., Glazier, D. I., Heid, E., Hornidge, D., Jahn, O., Jude, T. C., Kashevarov, V. L., Knezevic, A., Kondratiev, R., Korolija, M., Kotulla, M., Koulbardis, A., Kruglov, S., Krusche, B., Lemmer, B., Lisin, V., Livingston, K., MacGregor, I. J. D., Maghrbi, Y., Manley, D. M., Martinez-Fabregate, M., McGeorge, J. C., McNicoll, E. F., Mekterovic, D., Micanovic, S., Mushkarenkov, A., Nefkens, B. M. K., Nikolaev, A., Novotny, R., Ostrick, M., Owens, R. O., Pedroni, P., Pheron, F., Polonski, A., Robinson, J., Prakhov, S. N., Rosner, G., Rostomyan, T., Schumann, S., Sober, D., Suarez, I. M., Supek, I., Tarbert, C. M., Thiel, M., Thomas, A., Unverzagt, M., Watts, D. P., Werthmueller, D., Zamboni, I., and Zehr, F.
Subjects: High Energy Physics::Experiment, Nuclear Experiment
Abstract: The Dalitz decay eta -> gamma e(+)e(-) has been measured using the combined Crystal Ball and TAPS photon detector setup at the electron accelerator MAMI-C. Compared to the most recent transition form-factor measurement in the e(+)e(-) channel, statistics have been improved by one order of magnitude. The e(+)e(-)invariant mass distribution shows a deviation from the QED prediction for a point-like particle, which can be described by a form-factor. Using the usual monopole transition form-factor parameterization, F(m(2)) = (1 - m(2)/Lambda(2))(-1), a value of Lambda(-2) = (1.92 +/- 0.35(stat) +/- 0.13(syst)) GeV(-2) has been determined. This value is in good agreement with a recent measurement of the eta Dalitz decay in the mu(+)mu(-) channel and with recent form-factor calculations. An improved value of the branching ratio BR(eta -> gamma e(+)e(-)) = (6.6 +/- 0.4(stat) +/- 0.4(syst)) . 10(-3) has been determined. (C) 2011 Elsevier B.V. All rights reserved.
Published: 2011
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44. Upsilon(1S)->gamma+f2'(1525); f2'(1525)->K0sK0s decays

Author: The CLEO Collaboration, Besson, D., Hogan, D. P., Pedlar, T. K., Cronin-Hennessy, D., Hietala, J., Zweber, P., Dobbs, S., Metreveli, Z., Seth, K. K., Tomaradze, A., Xiao, T., Brisbane, S., Martin, L., Powell, A., Spradlin, P., Wilkinson, G., Mendez, H., Ge, J. Y., Miller, D. H., Shipsey, I. P. J., Xin, B., Adams, G. S., Hu, D., Moziak, B., Napolitano, J., Ecklund, K. M., Insler, J., Muramatsu, H., Park, C. S., Pearson, L. J., Thorndike, E. H., Yang, F., Ricciardi, S., Thomas, C., Artuso, M., Blusk, S., Mountain, R., Skwarnicki, T., Stone, S., Wang, J. C., Zhang, L. M., Bonvicini, G., Cinabro, D., Lincoln, A., Smith, M. J., Zhou, P., Zhu, J., Naik, P., Rademacker, J., Asner, D. M., Edwards, K. W., Randrianarivony, K., Tatishvili, G., Briere, R. A., Vogel, H., Onyisi, P. U. E., Rosner, J. L., Alexander, J. P., Cassel, D. G., Das, S., Ehrlich, R., Fields, L., Gibbons, L., Gray, S. W., Hartill, D. L., Heltsley, B. K., Kreinick, D. L., Kuznetsov, V. E., Patterson, J. R., Peterson, D., Riley, D., Ryd, A., Sadoff, A. J., Shi, X., Sun, W. M., Yelton, J., Rubin, P., Lowrey, N., Mehrabyan, S., Selen, M., Wiss, J., Libby, J., Kornicer, M., Mitchell, R. E., and Tarbert, C. M.
Subjects: High Energy Physics - Experiment (hep-ex), FOS: Physical sciences
Abstract: We report on a study of exclusive radiative decays of the Upsilon(1S) resonance into a final state consisting of a photon and two K0s candidates. We find evidence for a signal for Upsilon(1S)->gamma f_2'(1525); f_2'(1525)->K0sK0s, at a rate (4.0+/-1.3+/-0.6)x10^{-5}, consistent with previous observations of Upsilon(1S)->gamma f_2'(1525); f_2'(1525)->K+K-, and isospin. Combining this branching fraction with existing branching fraction measurements of Upsilon(1S)->gamma f_2'(1525) and J/psi->gamma f_2'(1525), we obtain the ratio of branching fractions: B(Upsilon(1S)->gamma f_2'(1525))/B(J/psi->gamma f_2'(1525))=0.09+/-0.02, approximately consistent with expectations based on soft collinear effective theory., submitted to Brief Reports
Published: 2011
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45. Model-independent determination of the strong-phase difference between D-0 and (D)over-bar(0) -> KS,L(0)h(+)h(-) (h = pi, K) and its impact on the measurement of the CKM angle gamma/phi(3)

Author: Libby, J., Kornicer, M., Mitchell, R. E., Shepherd, M. R., Tarbert, C. M., Besson, D., Pedlar, T. K., Xavier, J., Cronin-Hennessy, D., Hietala, J., Zweber, P., Dobbs, S., Metreveli, Z., Seth, K. K., Tomaradze, A., Xiao, T., Brisbane, S., Malde, S., Martin, L., Powell, A., Spradlin, P., Wilkinson, G., Mendez, H., Ge, J. Y., Miller, D. H., Shipsey, I. P. J., Xin, B., Adams, G. S., Hu, D., Moziak, B., Napolitano, J., Ecklund, K. M., Insler, J., Muramatsu, H., Park, C. S., Pearson, L. J., Thorndike, E. H., Yang, F., Ricciardi, S., Thomas, C., Artuso, M., Blusk, S., Horwitz, N., Mountain, R., Skwarnicki, T., Stone, S., Wang, J. C., Zhang, L. M., Gershon, T., Bonvicini, G., Cinabro, D., Lincoln, A., Smith, M. J., Zhou, P., Zhu, J., Naik, P., Rademacker, J., Asner, D. M., Edwards, K. W., Randrianarivony, K., Tatishvili, G., Briere, R. A., Vogel, H., Onyisi, P. U. E., Rosner, J. L., Alexander, J. P., Cassel, D. G., Das, S., Ehrlich, R., Fields, L., Gibbons, L., Gray, S. W., Hartill, D. L., Heltsley, B. K., Kreinick, D. L., Kuznetsov, V. E., Patterson, J. R., Peterson, D., Riley, D., Ryd, A., Sadoff, A. J., Shi, X., Sun, W. M., Yelton, J., Rubin, P., Lowrey, N., Mehrabyan, S., Selen, M., and Wiss, J.
Abstract: We report the first determination of the relative strong-phase difference between D-0 -> K-S,L(0) K+K- and (D) over bar (0) -> K-S,L(0) K+K-. In addition, we present updated measurements of the relative strong-phase difference between D-0 -> K-S,L(0) pi(+)pi(-) and (D) over bar (0) -> K-S,L(0) pi(+)pi(-). Both measurements exploit the quantum coherence between a pair of D-0 and (D) over bar (0) mesons produced from psi(3770) decays. The strong-phase differences measured are important for determining the Cabibbo-Kobayashi-Maskawa angle gamma/phi(3) in B- -> K- (D) over tilde (0) decays, where (D) over tilde (0) is a D-0 or (D) over bar (0) meson decaying to K(S)(0)h(+)h(-) (h = pi, K), in a manner independent of the model assumed to describe the D-0 -> K(S)(0)h(+)h(-) decay. Using our results, the uncertainty in gamma/phi(3) due to the error on the strong-phase difference is expected to be between 1.7 degrees and 3.9 degrees for an analysis using B- -> K- (D) over tilde (0), (D) over tilde (0) -> K-S(0) pi(+)pi(-) decays, and between 3.2 degrees and 3.9 degrees for an analysis based on B- -> K- -> (D) over tilde (0), (D) over tilde (0) -> K-S(0) K+K- decays. A measurement is also presented of the CP-odd fraction, F-, of the decay D-0 -> K-S(0) K+K- in the region of the phi -> K+K- resonance. We find that in a region within 0.01 GeV2/c(4) of the nominal phi mass squared F- > 0.91 at the 90% confidence level.
Published: 2010

46. Search for rare and forbidden decays of charm and charmed-strange mesons to final states h(+/-)e(-/+)e(+)

Author: Rubin, P., Lowrey, N., Mehrabyan, S., Selen, M., Wiss, J., Libby, J., Kornicer, M., Mitchell, R. E., Shepherd, M. R., Tarbert, C. M., Besson, D., Pedlar, T. K., Xavier, J., Cronin-Hennessy, D., Hietala, J., Zweber, P., Dobbs, S., Metreveli, Z., Seth, K. K., Tomaradze, A., Xiao, T., Brisbane, S., Martin, L., Powell, A., Spradlin, P., Wilkinson, G., Mendez, H., Ge, J. Y., Miller, D. H., Shipsey, I. P. J., Xin, B., Adams, G. S., Hu, D., Moziak, B., Napolitano, J., Ecklund, K. M., Insler, J., Muramatsu, H., Park, C. S., Pearson, L. J., Thorndike, E. H., Yang, F., Ricciardi, S., Thomas, C., Artuso, M., Blusk, S., Mountain, R., Skwarnicki, T., Stone, S., Wang, J. C., Zhang, L. M., Bonvicini, G., Cinabro, D., Lincoln, A., Smith, M. J., Zhou, P., Zhu, J., Naik, P., Rademacker, J., Asner, D. M., Edwards, K. W., Randrianarivony, K., Tatishvili, G., Briere, R. A., Vogel, H., Onyisi, P. U. E., Rosner, J. L., Alexander, J. P., Cassel, D. G., Das, S., Ehrlich, R., Fields, L., Gibbons, L., Gray, S. W., Hartill, D. L., Heltsley, B. K., Kreinick, D. L., Kuznetsov, V. E., Patterson, J. R., Peterson, D., Riley, D., Ryd, A., Sadoff, A. J., Shi, X., Sun, W. M., and Yelton, J.
Abstract: We have searched for flavor-changing neutral current decays and lepton-number-violating decays of D+ and D-s(+) mesons to final states of the form h(perpendicular to)e(-/+)e(+), where h is either pi or K. We use the complete samples of CLEO-c open-charm data, corresponding to integrated luminosities of 818 pb(-1) at the center-of-mass energy E-CM = 3.774 GeV containing 2.4 x 10(6) D+D- pairs and 602 pb(-1) at E-CM 4.170 GeV containing 0.6 x 10(6) D-s(*+/-) D-s(-/+) pairs. No signal is observed in any channel, and we obtain 90% confidence level upper limits on branching fractions B(D+ -> pi(+)e(+)e(-)) < 5.9 x 10(-6), B(D+ -> pi(-)e(+)e(-)) < 1.1 x 10(-6), B(D+ -> K(+)e(+)e(-)) < 3.0 x 10(-6), B(D+ -> K(+)e(+)e(-)) < 3.5 x 10(-6), B(D-s(+) -> pi(+)e(+)e(-)) < 2.2 x 10(-5), B(D-s(+) -> pi(+)e(+)e(-)) < 1.8 x 10(-5), B(D-s(+) -> K(+)e(+)e(-)) < 5.2 x 10(-5), and B(D-s(+) -> K(-)e(+)e(+)) < 1.7 x 10(-5).
Published: 2010

47. Study of psi(2S) decays to gamma p(p)over-bar, pi(0) p(p)over-bar, and eta p(p)over-bar, and search for p(p)over-bar threshold enhancements

Author: Alexander, J. P., Cassel, D. G., Das, S., Ehrlich, R., Fields, L., Gibbons, L., Gray, S. W., Hartill, D. L., Heltsley, B. K., Kreinick, D. L., Kuznetsov, V. E., Patterson, J. R., Peterson, D., Riley, D., Ryd, A., Sadoff, A. J., Shi, X., Sun, W. M., Yelton, J., Rubin, P., Lowrey, N., Mehrabyan, S., Selen, M., Wiss, J., Libby, J., Kornicer, M., Mitchell, R. E., Shepherd, M. R., Tarbert, C. M., Besson, D., Pedlar, T. K., Xavier, J., Cronin-Hennessy, D., Hietala, J., Zweber, P., Dobbs, S., Metreveli, Z., Seth, K. K., Tomaradze, A., Xiao, T., Brisbane, S., Martin, L., Powell, A., Spradlin, P., Wilkinson, G., Mendez, H., Ge, J. Y., Miller, D. H., Shipsey, I. P. J., Xin, B., Adams, G. S., Hu, D., Moziak, B., Napolitano, J., Ecklund, K. M., Insler, J., Muramatsu, H., Park, C. S., Pearson, L. J., Thorndike, E. H., Yang, F., Ricciardi, S., Thomas, C., Artuso, M., Blusk, S., Mountain, R., Skwarnicki, T., Stone, S., Wang, J. C., Zhang, L. M., Bonvicini, G., Cinabro, D., Lincoln, A., Smith, M. J., Zhou, P., Zhu, J., Naik, P., Rademacker, J., Asner, D. M., Edwards, K. W., Randrianarivony, K., Tatishvili, G., Briere, R. A., Vogel, H., Onyisi, P. U. E., and Rosner, J. L.
Subjects: High Energy Physics::Phenomenology, High Energy Physics::Experiment
Abstract: The decays of psi(2S) into gamma p (p) over bar, pi(0)p (p) over bar, and eta p (p) over bar have been studied with the CLEO-c detector using a sample of 24.5 X 10(6) psi(2S) events obtained from e(+)e(-) annihilations at root s = 3686 MeV. The data show evidence for the excitation of several N* resonances in p pi(0) and p eta channels in pi(0)p (p) over bar and eta p (p) over bar decays, and f(2) states in gamma p (p) over bar decay. Branching fractions for decays of c psi(2S) to gamma p (p) over bar, pi(0)p (p) over bar, and eta p (p) over bar have been determined. No evidence for p (p) over bar threshold enhancements was found in the reactions psi(2S) -> Xp (p) over bar where X = gamma, pi(0), eta. We do, however, find confirming evidence for a p (p) over bar threshold enhancement in J/psi -> gamma p (p) over bar as previously reported by BES.
Published: 2010

48. Branching fractions for chi(cJ) -> p(p)over-bar pi(0), p(p)over-bar eta, and p(p)over-bar omega

Author: Onyisi, P. U. E., Rosner, J. L., Alexander, J. P., Cassel, D. G., Das, S., Ehrlich, R., Fields, L., Gibbons, L., Gray, S. W., Hartill, D. L., Heltsley, B. K., Hunt, J. M., Kreinick, D. L., Kuznetsov, V. E., Ledoux, J., Patterson, J. R., Peterson, D., Riley, D., Ryd, A., Sadoff, A. J., Shi, X., Sun, W. M., Yelton, J., Rubin, P., Lowrey, N., Mehrabyan, S., Selen, M., Wiss, J., Adams, S., Kornicer, M., Mitchell, R. E., Shepherd, M. R., Tarbert, C. M., Besson, D., Pedlar, T. K., Xavier, J., Cronin-Hennessy, D., Hietala, J., Zweber, P., Dobbs, S., Metreveli, Z., Seth, K. K., Xiao, T., Tomaradze, A., Brisbane, S., Libby, J., Martin, L., Powell, A., Spradlin, P., Wilkinson, G., Mendez, H., Ge, J. Y., Miller, D. H., Shipsey, I. P. J., Xin, B., Adams, G. S., Hu, D., Moziak, B., Napolitano, J., Ecklund, K. M., Insler, J., Muramatsu, H., Park, C. S., Thorndike, E. H., Yang, F., Ricciardi, S., Thomas, C., Artuso, M., Blusk, S., Mountain, R., Skwarnicki, T., Stone, S., Wang, J. C., Zhang, L. M., Bonvicini, G., Cinabro, D., Lincoln, A., Smith, M. J., Zhou, P., Zhu, J., Naik, P., Rademacker, J., Asner, D. M., Edwards, K. W., Reed, J., Randrianarivony, K., Robichaud, A. N., Tatishvili, G., White, E. J., Briere, R. A., and Vogel, H.
Abstract: Using a sample of 25.9 x 10(6) psi(2S) decays acquired with the CLEO-c detector at the CESR e(+)e(-) collider, we report branching fractions for the decays chi(cJ) -> p (p) over bar pi(0), p (p) over bar eta, and p (p) over bar omega, with J = 0, 1, 2. Our results for B(chi(cJ) -> p (p) over bar pi(0)) and B(chi(cJ) -> p (p) over bar eta) are consistent with, but more precise than, previous measurements. Furthermore, we include the first measurement of B(chi(cJ) -> p (p) over bar omega).
Published: 2010

49. Analysis of D+ -> K- pi(+)e(+)nu(e) and D+ -> K- pi(+)mu(+)nu(mu) semileptonic decays

Author: Briere, R. A., Vogel, H., Onyisi, P. U. E., Rosner, J. L., Alexander, J. P., Cassel, D. G., Das, S., Ehrlich, R., Fields, L., Gibbons, L., Gray, S. W., Hartill, D. L., Heltsley, B. K., Hunt, J. M., Kreinick, D. L., Kuznetsov, V. E., Ledoux, J., Patterson, J. R., Peterson, D., Riley, D., Ryd, A., Sadoff, A. J., Shi, X., Sun, W. M., Yelton, J., Rubin, P., Lowrey, N., Mehrabyan, S., Selen, M., Wiss, J., Kornicer, M., Mitchell, R. E., Shepherd, M. R., Tarbert, C. M., Besson, D., Pedlar, T. K., Xavier, J., Cronin-Hennessy, D., Hietala, J., Zweber, P., Dobbs, S., Metreveli, Z., Seth, K. K., Ting, X., Tomaradze, A., Brisbane, S., Libby, J., Martin, L., Powell, A., Spradlin, P., Wilkinson, G., Mendez, H., Ge, J. Y., Miller, D. H., Shipsey, I. P. J., Xin, B., Adams, G. S., Hu, D., Moziak, B., Napolitano, J., Ecklund, K. M., Insler, J., Muramatsu, H., Park, C. S., Thorndike, E. H., Yang, F., Ricciardi, S., Thomas, C., Artuso, M., Blusk, S., Khalil, S., Mountain, R., Skwarnicki, T., Stone, S., Wang, J. C., Zhang, L. M., Bonvicini, G., Cinabro, D., Lincoln, A., Smith, M. J., Zhou, P., Zhu, J., Naik, P., Rademacker, J., Asner, D. M., Edwards, K. W., Reed, J., Randrianarivony, K., Robichaud, A. N., Tatishvili, G., and White, E. J.
Subjects: High Energy Physics::Experiment
Abstract: Using a large sample (approximate to 11800 events) of D+ -> K-pi(+)e(+)nu(e) and D+ -> K-pi(+)mu(+)nu(mu) decays collected by the CLEO-c detector running at the psi(3770), we measure the helicity basis form factors free from the assumptions of spectroscopic pole dominance and provide new, accurate measurements of the absolute branching fractions for D+ -> *(0)e(+)nu(e) D+ -> *(0)mu(+)nu(mu) decays. We find branching fractions which are consistent with previous world averages. Our measured helicity basis form factors are consistent with the spectroscopic pole dominance predictions for the three main helicity basis form factors describing D+ -> (K) over bar*(0)l(+)nu(l) decay. The ability to analyze D+ -> K-pi(+)mu(+)nu(mu) allows us to make the first nonparametric measurements of the mass-suppressed form factor. Our result is inconsistent with existing lattice QCD calculations. Finally, we measure the form factor that controls nonresonant s-wave interference with the D+ -> (K) over bar (0)l(+)nu(l) amplitude and search for evidence of possible additional nonresonant d- or f-wave interference with the K*(0).
Published: 2010

50. Search for the decay J/psi -> gamma plus invisible

Author: Insler, J., Muramatsu, H., Park, C. S., Thorndike, E. H., Yang, F., Ricciardi, S., Thomas, C., Artuso, M., Blusk, S., Khalil, S., Mountain, R., Skwarnicki, T., Stone, S., Wang, J. C., Zhang, L. M., Bonvicini, G., Cinabro, D., Lincoln, A., Smith, M. J., Zhou, P., Zhu, J., Naik, P., Rademacker, J., Asner, D. M., Edwards, K. W., Randrianarivony, K., Reed, J., Robichaud, A. N., Tatishvili, G., White, E. J., Briere, R. A., Vogel, H., Onyisi, P. U. E., Rosner, J. L., Alexander, J. P., Cassel, D. G., Ehrlich, R., Fields, L., Gibbons, L., Gray, S. W., Hartill, D. L., Heltsley, B. K., Hunt, J. M., Kreinick, D. L., Kuznetsov, V. E., Ledoux, J., Mahlke-Kruger, H., Patterson, J. R., Peterson, D., Riley, D., Ryd, A., Sadoff, A. J., Shi, X., Stroiney, S., Sun, W. M., Yelton, J., Rubin, P., Lowrey, N., Mehrabyan, S., Selen, M., Wiss, J., Kornicer, M., Mitchell, R. E., Shepherd, M. R., Tarbert, C. M., Besson, D., Pedlar, T. K., Xavier, J., Cronin-Hennessy, D., Gao, K. Y., Hietala, J., Poling, R., Zweber, P., Dobbs, S., Metreveli, Z., Seth, K. K., Ting, X., Tomaradze, A., Brisbane, S., Libby, J., Martin, L., Powell, A., Spradlin, P., Wilkinson, G., Mendez, H., Ge, J. Y., Miller, D. H., Shipsey, I. P. J., Xin, B., Adams, G. S., Hu, D., Moziak, B., Napolitano, J., and Ecklund, K. M.
Subjects: High Energy Physics::Experiment
Abstract: A search for J/psi radiative decay to weakly interacting neutral final states was performed using the CLEO-c detector at the Cornell Electron Storage Ring. J/psi events were selected by observing the hadronic decay psi(2S) -> pi(+)pi(-) J/psi. A total of 3.7 x 10(6) J/psi events were used to study the decay J/psi -> gamma + X, where X is a narrow state that is invisible to the detector. No significant signal was observed, and upper limits on the branching fraction were set for masses m(X) up to 960 MeV/c(2). The upper limit corresponding to m(X) = 0 is 4.3 x 10(-6) at the 90% confidence level.
Published: 2010

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