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1. The LUX-ZEPLIN (LZ) radioactivity and cleanliness control programs

Author

Mikkel B. Johnson, B. Landerud, A. Biekert, B. N. Edwards, K. Hanzel, T. E. Tope, D. Curran, C. Chiller, J. Palmer, R. Leonard, P. Sutcliffe, E. D. Fraser, R. Bunker, J. So, A. A. Chiller, M. R. While, A. Dobi, D. Hamilton, M. G. D. van der Grinten, W. J. Wisniewski, J. Li, A. Fan, J.S. Saba, C. Lynch, Henrique Araujo, S. Luitz, J. Nesbit, M. Horn, C. D. Kocher, Catarina Silva, F. G. O’Neill, J. C. Davis, J. J. Silk, M. C. Carmona-Benitez, Simon Fayer, M. Pangilinan, K. O’Sullivan, D. Lucero, Q. Xiao, D. Hemer, B. Boxer, J. M. Lyle, C. Chan, C. E. Tull, J. Genovesi, A. Vaitkus, M. Arthurs, V. B. Francis, S. Kravitz, X. Liu, H. J. Birch, R. Linehan, S. Walcott, C. H. Faham, T. J. Anderson, A. B.M.R. Sazzad, D. White, A. Kamaha, M. S. Witherell, R. Studley, K. Sundarnath, R. Liu, H. Oh, L. Korley, H. Flaecher, R. Conley, K. Kamdin, P. Beltrame, S. Stephenson, C. Pereira, C. R. Hall, R. Cabrita, B. Holbrook, B. G. Lenardo, P. Majewski, T.M. Stiegler, I. B. Peterson, A. Manalaysay, A. Monte, C. Ghag, H. Kraus, C. Loniewski, J. Makkinje, X. Xiang, Robert A. Taylor, M. N. Irving, S. Uvarov, Michael Schubnell, J. Heise, R. Coughlen, A. Lambert, F. Froborg, L. Oxborough, D.C. Malling, S. Greenwood, J. Yin, S. J. Haselschwardt, H. J. Krebs, W. H. Lippincott, K. J. Palladino, R. E. Smith, V. A. Kudryavtsev, I. Olcina, C. M. Ignarra, A. Harrison, A. J. Bailey, Minfang Yeh, D. Bauer, W. Skulski, J. Keefner, O. Hitchcock, Ben Carlson, E. Leason, Benjamin Krikler, A. Cottle, E. Mizrachi, Michele Cascella, M. Khaleeq, M. Solmaz, T. J. Whitis, J. J. Wang, N. Angelides, S. Gokhale, K. Skarpaas, Daniel McKinsey, S. Dardin, S. Kyre, D. Santone, P. R. Scovell, T. Vietanen, S. Powell, Y. Wang, David Leonard, E. Morrison, N. Swanson, M. Sarychev, M. A. Olevitch, E. K. Pease, M. Elnimr, P. Brás, N.J. Gantos, R. G. Jacobsen, J. Migneault, Yeongduk Kim, W. Turner, S. D. Worm, Seth Hillbrand, T. Fruth, G. Gregerson, Wenzhao Wei, V. Kasey, L. Kreczko, J. R. Watson, A. Bhatti, D. Naim, Ethan Bernard, B. J. Mount, V. N. Solovov, C. Nedlik, K. Wilson, Elena Korolkova, G. R. C. Rischbieter, P. Ford, A. Stevens, D. J. Taylor, H. N. Nelson, F. Neves, S. Aviles, W. T. Emmet, K. Stifter, B. Birrittella, J. T. White, S. J. Patton, D. Molash, M. Severson, T. A. Shutt, A. Richards, D Kodroff, J. Lin, Kareem Kazkaz, T. P. Biesiadzinski, David Colling, J. Liao, J. Mock, J. A. Morad, E. Holtom, J. E. Y. Dobson, Bjoern Penning, C. E. Dahl, A. Dushkin, A. Konovalov, D. J. Markley, G. W. Shutt, N. Parveen, M. G. D. Gilchriese, Yanwen Liu, C. Carels, Martin Breidenbach, Kathrin C. Walker, V.V. Sosnovtsev, A. Naylor, K. T. Lesko, N. A. Larsen, C. Lee, A. Pagac, J. J. Cherwinka, N. Decheine, J. Bang, J. A. Nikoleyczik, Patrick Bauer, J.P. Rodrigues, S. Branson, T. J. R. Davison, B. Lopez Paredes, D. Pagenkopf, J. S. Campbell, M. Tan, K. C. Oliver-Mallory, M.J. Barry, J. Belle, D. Yu. Akimov, M. Timalsina, S. Shaw, Alexander Bolozdynya, W. Ji, Sridhara Dasu, D. Q. Huang, J. Edwards, F. L. H. Wolfs, K. E. Boast, J. Busenitz, Ren-Jie Wang, S. Fiorucci, N. Stern, C. Rhyne, V. Bugaev, A. Laundrie, G. Rutherford, G. Pereira, E. H. Miller, W. W. Craddock, S. Alsum, J.P. da Cunha, Richard J. Smith, A. Cole, W. Wang, Julie Harrison, I. Khurana, M. Utes, R. J. Gaitskell, J. Kras, D. Khaitan, R. L. Mannino, J. D. Wolfs, H. Auyeung, L. de Viveiros, E. Voirin, E. M. Boulton, N. I. Chott, I. Stancu, L. Tvrznikova, Richard Rosero, P. MarrLaundrie, D. R. Tronstad, T. Benson, Dongming Mei, T. J. Sumner, O. Jahangir, J. Va’vra, Ross G. White, L. Sabarots, A. Currie, A. R. Smith, W. L. Waldron, J. P. Coleman, E. Lopez-Asamar, Wolfgang Lorenzon, A. Piepke, Carl Gwilliam, S. Hans, T. Harrington, Laura Manenti, A. Greenall, F.-T. Liao, G. Cox, J. R. Bensinger, V. M. Gehman, H. J. Rose, Christopher Brew, X. Bai, P. Sorensen, A. Arbuckle, Y. Qie, R. C. Webb, R.M. Gerhard, T.W. Hurteau, K.J. Thomas, P. Rossiter, C. Hasselkus, W. G. Jones, J. Johnson, R. Gelfand, T. G. Gonda, C. O. Vuosalo, A. St. J. Murphy, Adam Bernstein, Chao Zhang, A. Nilima, R. M. Preece, T. K. Edberg, Q. Riffard, B. P. Tennyson, Yue Meng, C. Maupin, J. E. Cutter, J. Reichenbacher, J.Y-K. Hor, N. Marangou, D. Temples, Eli Gibson, M. Hoff, H. S. Lee, J. H. Buckley, Z. J. Minaker, M.I. Lopes, M. Koyuncu, P. A. Terman, J.R. Verbus, Bhawna Gomber, J. A. Nikkel, A. Alquahtani, I. M. Fogarty Florang, D. Seymour, A. V. Kumpan, Antonin Vacheret, C. Hjemfelt, M.R. Stark, S. Pierson, M. Racine, D. R. Tiedt, D. S. Akerib, A. Khazov, W. C. Taylor, J. Balajthy, A.V. Khromov, A. C. Kaboth, V. M. Palmaccio, Duncan Carlsmith, K. Pushkin, S. A. Hertel, S. N. Jeffery, E. Druszkiewicz, R. W. Schnee, S. Pal, R. Bramante, B. N. Ratcliff, M. E. Monzani, J. O'Dell, P. Zarzhitsky, L. Wang, P. Johnson, Matthew Szydagis, W. H. To, J. E. Armstrong, U. Utku, Mani Tripathi, D. Woodward, D. Garcia, W. R. Edwards, Carl W. Akerlof, Jilei Xu, C. Nehrkorn, Ian S. Young, J. McLaughlin, J. Thomson, S. R. Eriksen, R. Rucinski, T.J. Martin, C. Levy, Sergey Burdin, A. Baxter, A. Lindote, L. Reichhart, Juhyeong Lee, S. Balashov, C. T. McConnell, M. F. Marzioni, A. Tomás, W. T. Kim, S. Weatherly, and Science and Technology Facilities Council (STFC)

Subjects
BACKGROUNDS, Particle physics, Photomultiplier, Physics - Instrumentation and Detectors, Physics and Astronomy (miscellaneous), FOS: Physical sciences, lcsh:Astrophysics, Scintillator, 01 natural sciences, High Energy Physics - Experiment, Physics, Particles & Fields, High Energy Physics - Experiment (hep-ex), WIMP, lcsh:QB460-466, 0103 physical sciences, lcsh:Nuclear and particle physics. Atomic energy. Radioactivity, Gamma spectroscopy, Sensitivity (control systems), 010306 general physics, DETECTOR, physics.ins-det, 0206 Quantum Physics, Engineering (miscellaneous), Physics, Science & Technology, hep-ex, 010308 nuclear & particles physics, Scattering, IMPURITIES, Instrumentation and Detectors (physics.ins-det), Nuclear & Particles Physics, Physical Sciences, 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics, Content (measure theory), lcsh:QC770-798, CONSTRUCTION MATERIALS
Abstract

LUX-ZEPLIN (LZ) is a second-generation direct dark matter experiment with spin-independent WIMP-nucleon scattering sensitivity above $1.4 \times 10^{-48}$ cm$^{2}$ for a WIMP mass of 40 GeV/c$^{2}$ and a 1000 d exposure. LZ achieves this sensitivity through a combination of a large 5.6 t fiducial volume, active inner and outer veto systems, and radio-pure construction using materials with inherently low radioactivity content. The LZ collaboration performed an extensive radioassay campaign over a period of six years to inform material selection for construction and provide an input to the experimental background model against which any possible signal excess may be evaluated. The campaign and its results are described in this paper. We present assays of dust and radon daughters depositing on the surface of components as well as cleanliness controls necessary to maintain background expectations through detector construction and assembly. Finally, examples from the campaign to highlight fixed contaminant radioassays for the LZ photomultiplier tubes, quality control and quality assurance procedures through fabrication, radon emanation measurements of major sub-systems, and bespoke detector systems to assay scintillator are presented., Comment: 45 pages (79 inc. tables), 7 figures, 9 tables

Published
2020
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2. Simulations of Events for the LUX-ZEPLIN (LZ) Dark Matter Experiment

Author

T. Fruth, D. Seymour, J. Lin, W. Ji, J. McLaughlin, J. Palmer, L. Tvrznikova, M. Tan, P. R. Scovell, J. Genovesi, Ethan Bernard, E. H. Miller, F. L. H. Wolfs, G. Rutherford, V. Bugaev, J. Kras, D. Woodward, B. Lopez Paredes, M. Solmaz, E. Morrison, A. Biekert, I. Stancu, A. Lindote, K. E. Boast, A. Fan, Kareem Kazkaz, Juhyeong Lee, I. Olcina, A. Bhatti, A. Alqahtani, M. G. D. Gilchriese, S. Balashov, D. Santone, C. Carels, A. Piepke, Ross G. White, A. Cottle, M. E. Monzani, F.-T. Liao, T. P. Biesiadzinski, C. Loniewski, J. Y.K. Hor, J. E. Cutter, J. Reichenbacher, M. G. D. van der Grinten, N. I. Chott, P. Zarzhitsky, Matthew Szydagis, C. Levy, Sergey Burdin, K. J. Palladino, P. Rossiter, Elena Korolkova, Laura Manenti, G. R. C. Rischbieter, A. Baxter, D. R. Tiedt, C. E. Dahl, B. Boxer, T. K. Edberg, S. A. Hertel, Q. Riffard, U. Utku, K. C. Oliver-Mallory, R. W. Schnee, S. Pal, G. Pereira, Richard J. Smith, Michele Cascella, David Leonard, E. Druszkiewicz, D. S. Akerib, Mani Tripathi, A. Nilima, Simon Fayer, M. Timalsina, E. K. Pease, D. Temples, K. Pushkin, N. Angelides, P. Majewski, M. C. Carmona-Benitez, T. J. Anderson, N. Marangou, J. Busenitz, W. H. Lippincott, Michael Schubnell, A. B.M.R. Sazzad, C. Rhyne, J. E. Armstrong, V. N. Solovov, A. Manalaysay, A. Khazov, J.J. Silk, A. St. J. Murphy, Adam Bernstein, A. Naylor, D. Naim, S. Shaw, J. Li, S. Luitz, S. Gokhale, A. Cole, R. J. Gaitskell, J. H. Buckley, L. Korley, N. Parveen, K. Kamdin, R. Linehan, Minfang Yeh, W. C. Taylor, D. Q. Huang, B. J. Mount, T. A. Shutt, Catarina Silva, Carl W. Akerlof, Jilei Xu, C. Nehrkorn, H. J. Birch, J. Balajthy, M.I. Lopes, O. Jahangir, A. Monte, Daniel McKinsey, A. C. Kaboth, J. E. Y. Dobson, X. Xiang, A. Richards, C. Ghag, V. A. Kudryavtsev, C. Chan, A. Vaitkus, S. Kravitz, D. Khaitan, J. J. Wang, C. M. Ignarra, P. A. Terman, D. Bauer, M. F. Marzioni, A. Tomás, L. Kreczko, J. R. Watson, A. Harrison, R. L. Mannino, Antonin Vacheret, S. J. Haselschwardt, M. Arthurs, F. Neves, W. Wang, E. D. Fraser, P. Sorensen, E. Leason, T. J. Sumner, P. Brás, Henning Flaecher, Benjamin Krikler, K. T. Lesko, Yue Meng, T. J. Whitis, X. Bai, E. Mizrachi, J. Johnson, S. R. Eriksen, Duncan Carlsmith, Wolfgang Lorenzon, X. Liu, N. Swanson, J. R. Bensinger, Eli Gibson, A. Kamaha, H. N. Nelson, W. Turner, C. Nedlik, Henrique Araujo, C. R. Hall, R. Cabrita, H. Kraus, R. Liu, Richard Rosero, D. R. Tronstad, R. C. Webb, L. de Viveiros, K. Stifter, S. Fiorucci, J. Liao, J. A. Morad, J. Bang, J. A. Nikoleyczik, M. Horn, C. D. Kocher, J. M. Lyle, Robert A. Taylor, S. Alsum, I. Khurana, A. Stevens, and Bjoern Penning

Subjects
Physics, Particle physics, Physics - Instrumentation and Detectors, hep-ex, 010308 nuclear & particles physics, Physics::Instrumentation and Detectors, Monte Carlo method, Detector, Dark matter, FOS: Physical sciences, Astronomy and Astrophysics, Instrumentation and Detectors (physics.ins-det), 01 natural sciences, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), WIMP, 0103 physical sciences, Sensitivity (control systems), Projection (set theory), physics.ins-det, 010303 astronomy & astrophysics, Event (particle physics), Background radiation
Abstract

The LUX-ZEPLIN dark matter search aims to achieve a sensitivity to the WIMP-nucleon spin-independent cross-section down to (1--2)$\times10^{-12}$\,pb at a WIMP mass of 40 GeV/$c^2$. This paper describes the simulations framework that, along with radioactivity measurements, was used to support this projection, and also to provide mock data for validating reconstruction and analysis software. Of particular note are the event generators, which allow us to model the background radiation, and the detector response physics used in the production of raw signals, which can be converted into digitized waveforms similar to data from the operational detector. Inclusion of the detector response allows us to process simulated data using the same analysis routines as developed to process the experimental data., Comment: 24 pages, 19 figures; Corresponding Authors: A. Cottle, V. Kudryavtsev, D. Woodward

Published
2020
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3. RAPIDITY DEPENDENCE OF THE CHARGED-PARTICLE MULTIPLICITY DISTRIBUTIONS IN E+E- ANNIHILATION AT 29 GEV

Author

M. Willutzky, Harold Ogren, C. R. Ng, D. E. Wood, P. Kooijman, D. I. Meyer, R. P. Thun, B. G. Bylsma, D. H. Miller, D. R. Rust, J. Schlereth, S. W. Gray, D.S. Koltick, R. Debonte, D. Nitz, J. W. Chapman, H. A. Neal, R. L. McIlwain, S. Abachi, D. Errede, C. K. Jung, A. A. Seidl, N. Harnew, P. Kesten, B. Musgrave, F. J. Loeffler, B. Cork, Carl W. Akerlof, B. B. Brabson, K. Sugano, M. Derrick, E. H. Low, G. Bonvicini, L. E. Price, L. K. Rangan, J.M. Weiss, K. K. Gan, T. Trinko, J. S. Loos, D. Blockus, P. Baringer, I. Beltrami, M. Valdata-Nappi, and E. I. Shibata

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Annihilation, Spectrometer, Electron–positron annihilation, Negative binomial distribution, Multiplicity (mathematics), Rapidity, Scaling, Charged particle
Abstract

The charged particle multiplicity distribution for e+e− annihilations at s = 29 GeV has been measured using the High Resolution Spectrometer at PEP. The multiplicity distribution, expressed as a function of the mean, shows KNO scaling when compared to e+e− data at other energies. Multiplicity distributions for particles selected in different central rapidity spans are presented. All of these are well presented by the Negative binomial distribution. As the rapidity span is narrowed, the distributions become broader and approach a constant value of the parameter k.

Published
2016

4. NEW RESULTS FROM BHABHA SCATTERING AT 29 GEV

Author

A. A. Seidl, P. Kesten, B. B. Brabson, C. R. Ng, D.S. Koltick, N. Harnew, F. J. Loeffler, M. Derrick, B. G. Bylsma, C. K. Jung, E. H. Low, R. P. Thun, D. H. Miller, M. Willutzky, J.M. Weiss, D. Nitz, R. Debonte, G. Bonvicini, L. E. Price, D. E. Wood, H. A. Neal, S. W. Gray, D. I. Meyer, D. Errede, J. W. Chapman, J. S. Loos, L. K. Rangan, T. Trinko, P. Kooijman, K. K. Gan, Carl W. Akerlof, P. Baringer, Harold Ogren, D. Blockus, M. Valdata-Nappi, E. I. Shibata, I. Beltrami, R. L. McIlwain, S. Abachi, J. Schlereth, B. Musgrave, B. Cork, K. Sugano, and D. R. Rust

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Range (particle radiation), Partial width, High Energy Physics::Experiment, Polar coordinate system, Bhabha scattering, Boson
Abstract

Results are reported on a high statistics study of Bhabha scattering at 29 GeV in the polar angle region, |cos θ| < 0.55. The data are consistent with the standard model, and measure vector and axial-vector coupling constants of gv2 = 0.03 ± 0.09 and ga2 = 0.46±0.14. Limits on the QED-cutoff parameters are Λ+ > 154 GeV and Λ- > 220 GeV. Lower limits on scale parameters of composite models are in the range 0.9-2.8 TeV. The partial width of a hypothetical spin-zero boson decaying to e+e- has an upper limit which varies from 6 to 57 MeV corresponding to a boson mass in the range 45-80 GeV/c2. © 1986.

Published
2016
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5. COMPARISON OF LIGHT QUARK AND CHARM QUARK FRAGMENTATION

Author

B. Musgrave, C. K. Jung, D. H. Miller, J. Schlereth, M. Derrick, E. H. Low, M. Valdata-Nappi, G. Bonvicini, L. E. Price, R. Debonte, S. W. Gray, J. S. Loos, J. W. Chapman, L. K. Rangan, Harold Ogren, P. Kooijman, D. Errede, M. Willutzky, P. Baringer, C. R. Ng, D. E. Wood, N. Harnew, Carl W. Akerlof, K. K. Gan, D. I. Meyer, J.M. Weiss, R. P. Thun, B. B. Brabson, T. Trinko, R. L. McIlwain, S. Abachi, D. Blockus, I. Beltrami, E. I. Shibata, F. J. Loeffler, B. G. Bylsma, H. A. Neal, A. A. Seidl, B. Cork, K. Sugano, D. R. Rust, P. Kesten, and D. Nitz

Subjects
Quark, Physics, Nuclear and High Energy Physics, Particle physics, Top quark, Down quark, Bottom quark, Charm quark, Nuclear physics, Quark star, Up quark, High Energy Physics::Experiment, B meson, Nuclear Experiment
Abstract

Separate samples of charm quark and light quark (u, d, s) jets have been isolated in an experiment studying e+e− annihilations at s = 29 GeV . The results come from data corresponding to an integrated luminosity of 111 pb−1 collected by the High Resolution Spectrometer. Differences were observed in charged multiplicities, momentum distributions, and rapidity of the size expected from the different fragmentation functions and leading particle decay properties of the two samples.

Published
2016

6. SEARCH FOR HEAVY NEUTRAL LEPTONS IN E+E- ANNIHILATIONS AT 29 GEV

Author

U. Mallik, R. Stevens, D. Rubin, J.M. Weiss, J. S. Loos, D. R. Rust, J. P. Guillaud, H. O. Ogren, S. P. Ahlen, T. Trinko, R. L. McIlwain, L. E. Price, I. Beltrami, Robert Wilson, M. Valdata-Nappi, G. E. Forden, L. K. Rangan, E. I. Shibata, E. Fernandez, G. Baranko, B. B. Brabson, C. R. Ng, R. Fries, K. K. Gan, B. Cork, F. J. Loeffler, J. W. Chapman, D. Nitz, L. G. Hyman, S. Kooijman, M. Derrick, P. Kooijman, A. A. Seidl, L.P. Keller, D. Blockus, K. Sugano, R. Debonte, R. P. Thun, B. Musgrave, J. Va’vra, Carl W. Akerlof, H. A. Neal, N. Harnew, M. Willutzky, P. P. Ong, D. E. Wood, P. Kesten, D. I. Meyer, D. H. Miller, J. Schlereth, D. Errede, P. Baringer, S. W. Gray, D.S. Koltick, M. Daigo, and C. K. Jung

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Range (particle radiation), Muon, Luminosity (scattering theory), Meson, Lepton
Abstract

A search was made in 29 GeV e+e− annihilations for heavy, neutral leptons decaying to e±X∓(ν), where X is a muon or charged meson. Six events with isolated e±X∓ pairs were found for an intergrated luminosity of 106 pb−1. The expected background is 5.5 ± 2.2 events. Limits on σ s B depend on mass and range from 8 to 20 × 10−5 nb.

Published
2016
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7. Neutral K*(890) and ρ0 meson production in e+e- annihilation at ;s=29GeV

Author

D. H. Miller, J. W. Chapman, J. Schlereth, M. Willutzky, I. Beltrami, D. E. Wood, D. Errede, E. I. Shibata, M. Valdata-Nappi, M. Derrick, K. K. Gan, P. Kesten, E. H. Low, R. L. McIlwain, S. Abachi, D. R. Rust, N. Harnew, R. Debonte, R. P. Thun, J. S. Loos, B. B. Brabson, D. Blockus, H. O. Ogren, F. J. Loeffler, C. K. Jung, G. Bonvicini, L. E. Price, B. Cork, J.M. Weiss, D. I. Meyer, L. K. Rangan, S. W. Gray, B. G. Bylsma, T. Trinko, P. Kooijman, K. Sugano, B. Musgrave, P. Baringer, H. A. Neal, D. Nitz, A. A. Seidl, Carl W. Akerlof, C. R. Ng, and D.S. Koltick

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Annihilation, Meson, Spectrometer, High Energy Physics::Lattice, High Energy Physics::Phenomenology, Nuclear Theory, Pseudoscalar meson, Charm quark, Nuclear physics, Momentum, High Energy Physics::Experiment, Vector meson, Nuclear Experiment, Event (particle physics)
Abstract

The production of neutral K∗(890) and ρ0 mesons was studied in e+e− annihilation at s =29 GeV using the High Resolution Spectrometer at PEP. Differential cross sections are presented as a function of the scaled energy variable z and compared to π0 and K0 production. The measured multiplicities are 0.84±0.08 ϱ0 mesons and 0.57±0.09 K ∗0 (890) mesons per event for a meson momentum greater than 725 MeV/c. The ratios of vector meson to pseudoscalar meson production for (u,d), s and c quark are compared to predictions of the Lund model.

Published
2016
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8. INCLUSIVE CHARGED-PARTICLE PRODUCTION NEAR THE KINEMATIC LIMIT IN E+E- ANNIHILATION AT 29 GEV

Author

M. Derrick, D. Nitz, K. K. Gan, B. G. Bylsma, E. H. Low, D. Errede, B. Cork, C. R. Ng, D.S. Koltick, H. A. Neal, G. Bonvicini, L. E. Price, N. Harnew, L. K. Rangan, J.M. Weiss, B. B. Brabson, K. Sugano, S. W. Gray, J. W. Chapman, Harold Ogren, P. Baringer, D. R. Rust, F. J. Loeffler, P. Kesten, A. A. Seidl, C. K. Jung, T. Trinko, M. Valdata-Nappi, D. I. Meyer, I. Beltrami, P. Kooijman, R. P. Thun, E. I. Shibata, J. S. Loos, D. Blockus, R. Debonte, Carl W. Akerlof, D. H. Miller, J. Schlereth, M. Willutzky, D. E. Wood, R. L. McIlwain, S. Abachi, and B. Musgrave

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Range (particle radiation), Annihilation, Spectrometer, Cluster (physics), Lund string model, High Energy Physics::Experiment, Kinematics, Limit (mathematics), Charged particle
Abstract

Inclusive production of charged particles has been studied in e+e- annihilation at ss=29 GeV using the high resolution spectrometer at PEP. Differential cross sections are presented in the range of scaled energy 0.1

Published
2016

9. LUX-ZEPLIN (LZ) Conceptual Design Report

Author

V. B. Francis, A. Bernstein, A. Manalaysay, C. Chan, C. E. Tull, Eli Woods, B. N. Ratcliff, Ethan Bernard, R. W. Schnee, N.A. Larsen, V.V. Sosnovtsev, Elena Korolkova, M. Sarychev, James Nikkel, J. J. Cherwinka, S. Luitz, Peter Majewski, J.S. Saba, Henrique Araujo, D. White, B. N. Edwards, W. H. Lippincott, F. G. O'Neill, A. Khazov, X. Ji, M. E. Monzani, B. Holbrook, K. O'Sullivan, Laura Manenti, J. Liu, P.R. Scovell, D.C. Malling, E. M. Boulton, M. G. D. van der Grinten, W.L. Waldron, W. C. Taylor, D. S. Akerib, C. R. Hall, Mikkel B. Johnson, F.L.H. Wolfs, J. Lin, Matthew Szydagis, J. Balajthy, K. J. Palladino, T. P. Biesiadzinski, H. Kraus, A. Currie, C. E. Dahl, R. Bunker, E. K. Pease, C. Silva, V. N. Solovov, J. Thomson, M. R. While, A. Dobi, H. N. Nelson, T. J. Sumner, K. C. Oliver-Mallory, W. H. To, I. Stancu, S. Stephenson, M. Pangilinan, T. J. Whitis, R. Bramante, K. E. Boast, T.J. Martin, L. Tvrznikova, A. Lindote, Patrick Bauer, J. O'Dell, L. Wang, D. Woodward, V. A. Kudryavtsev, H.J. Krebs, M. Elnimr, D. R. Tiedt, J.P. Rodrigues, J. Busenitz, Hoff, S. Kyre, F. Neves, L. Reichhart, C. Fu, Wolfgang Lorenzon, C. Rhyne, W. J. Wisniewski, M.J. Barry, C. M. Ignarra, M. C. Carmona-Benitez, W. Skulski, W. R. Edwards, Carl W. Akerlof, R. J. Gaitskell, S. Balashov, Michael Schubnell, Olevitch, S. J. Patton, B. P. Tennyson, M. F. Marzioni, D. Khaitan, R. L. Mannino, K. Kamdin, W. Craddock, S. D. Worm, V. M. Gehman, Y. Ju, A. J. Bailey, Daniel McKinsey, B. G. Lenardo, P. Beltrame, H. J. Rose, Minfang Yeh, Sergey Burdin, R.M. Gerhard, X. Liu, K. Skarpaas, S. A. Hertel, E. Druszkiewicz, A. St. J. Murphy, T.M. Stiegler, T.W. Hurteau, K.J. Thomas, J. Yin, A. Tomás, K. Kazkaz, C. Chiller, S. Powell, M. Cascella, T. J. R. Davison, Chao Zhang, A.A. Chiller, T. A. Shutt, J. A. Morad, J. Reichenbacher, J. E. Y. Dobson, R. M. Preece, N.J. Gantos, S. J. Haselschwardt, S. Uvarov, S.K. Young, M. G. D. Gilchriese, M.I. Lopes, Ben Carlson, J. Va’vra, J. E. Cutter, A.V. Khromov, C. Carels, Alexander Bolozdynya, V. Bugaev, R.G. Jacobsen, A. Harris, Wenzhao Wei, D. J. Taylor, D.Yu. Akimov, Dongming Mei, Duncan Carlsmith, Witherell, E. Holtom, W. Ji, C. H. Faham, S. Alsum, F.-T. Liao, D. Q. Huang, C. Ghag, C. O. Vuosalo, Bhawna Gomber, Mani Tripathi, Richard Rosero, R. C. Webb, L. de Viveiros, W. T. Emmet, Sridhara Dasu, S. Fiorucci, J.P. da Cunha, P. A. Terman, X. Bai, D. Markley, J. Mock, A. V. Kumpan, M.R. Stark, P. Sorensen, Yue Meng, K. T. Lesko, C. Lee, E. H. Miller, S. Shaw, A. Piepke, K. Sundarnath, A. Konovalov, T. K. Edberg, K. Pushkin, P. Ford, J. H. Buckley, and J.R. Verbus

Subjects
Physics, Particle physics, Expected cost, hep-ex, 010308 nuclear & particles physics, Technical systems, Detector, 01 natural sciences, 7. Clean energy, Particle detector, Nuclear physics, Conceptual design, Weakly interacting massive particles, 0103 physical sciences, 010306 general physics, physics.ins-det, astro-ph.IM
Abstract

The design and performance of the LUX-ZEPLIN (LZ) detector is described as of March 2015 in this Conceptual Design Report. LZ is a second-generation dark-matter detector with the potential for unprecedented sensitivity to weakly interacting massive particles (WIMPs) of masses from a few GeV/c2 to hundreds of TeV/c2. With total liquid xenon mass of about 10 tonnes, LZ will be the most sensitive experiment for WIMPs in this mass region by the end of the decade. This report describes in detail the design of the LZ technical systems. Expected backgrounds are quantified and the performance of the experiment is presented. The LZ detector will be located at the Sanford Underground Research Facility in South Dakota. The organization of the LZ Project and a summary of the expected cost and current schedule are given.

Published
2015
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10. ψproduction inp¯Nandπ−Ninteractions at 125 GeV/cand a determination of the gluon structure functions of thep¯and theπ−

Author

Spyros Tzamarias, W. Schappert, S. Katsanevas, J. Enagonio, Dg Stairs, S. Conetti, D. Nitz, Christine Kourkoumelis, Zhang Nai-Jian, H. Areti, A. Markou, R. L. Wagner, R. Kephart, He Mao, L. K. Resvanis, Wannian Yang, D. G. Ryan, P. Kraushaar, D. Judd, R. P. Thun, P. K. Malhotra, C. Hojvat, Bradley Cox, Timothy A. Ryan, M. Binkley, G. Voulgaris, P.O. Mazur, D. E. Wagoner, F. Turkot, Carl W. Akerlof, and P. Lebrun

Subjects
Physics, Particle physics, Crystallography, Angular distribution, TheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITY, Structure function, Transverse momentum, Pi, Calculation methods, MathematicsofComputing_DISCRETEMATHEMATICS, Gluon, Bar (unit)
Abstract

We have measured the cross section for production of [psi] and [psi][prime] in [ital [bar p]] and [pi][sup [minus]] interactions with Be, Cu, and W targets in experiment E537 at Fermilab. The measurements were performed at 125 GeV/[ital c] using a forward dimuon spectrometer in a closed geometry configuration. The gluon structure functions of the [ital [bar p]] and [pi][sup [minus]] have been extracted from the measured [ital d][sigma]/[ital dx][sub [ital F]] spectra of the produced [psi]'s. From the [ital [bar p]]W data we obtain, for [ital [bar p]], [ital xG]([ital x])=(2.15[plus minus]0.7)[1[minus][ital x]][sup (6.83[plus minus]0.5)] [1+(5.85[plus minus]0.95)[ital x]]. In the [pi][sup [minus]] case, we obtain, from the W and the Be data separately, [ital xG]([ital x])=(1.49[plus minus]0.03)[1[minus][ital x]][sup (1.98[plus minus]0.06)] (for [pi][sup [minus]]W), [ital xG]([ital x])=(1.10[plus minus]0.10)[1[minus][ital x]][sup (1.20[plus minus]0.20)] (for [pi][sup [minus]]Be).

Published
1993
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11. Study of inclusiveΛproduction ine+e−annihilations at 29 GeV

Author

B. B. Brabson, Jose Repond, D. Blockus, D. R. Rust, P. Kooijman, D. Nitz, R. Tschirhart, C. K. Jung, S. Abachi, R. P. Thun, B. Cork, P. Baringer, D. H. Miller, K. Sugano, P. Kesten, R. L. McIlwain, B. Musgrave, E. I. Shibata, K. Rangan, Carl W. Akerlof, A. Snyder, D. I. Meyer, J. W. Chapman, M. T. Ken, M. Derrick, E. H. Low, B. G. Bylsma, H. O. Ogren, L. E. Price, H. A. Neal, R. Debonte, D. Errede, T. L. Geld, C. R. Ng, and J. M. Brom

Subjects
Baryon, Physics, Particle physics, Annihilation, Electron–positron annihilation, Hadron, Hyperon, Strangeness, Atomic physics, Lambda baryon, Lambda
Abstract

Cross sections are presented for the inclusive production of {Lambda} hyperons in electron-positron annihilations at {radical}{ital s} =29 GeV based on the full 291-pb{sup {minus}1} sample of data taken in the High Resolution Spectrometer experiment at the SLAC {ital e}{sup +}{ital e}{minus} storage ring PEP. These results, and the associated correlation analyses, are consistent with the Lund model predictions with the strange diquark suppression ratio {delta} fixed at 0.59{plus minus}0.10{plus minus}0.18, as compared to the standard Lund value of 0.32. The {Lambda} multiplicity has been found to be 0.182{plus minus}0.020 per event. The opposite-strangeness multiplicity {l angle}{ital n}{sub {Lambda}}{Lambda}{bar a}{r angle} has been measured to be 0.046{plus minus}0.020, whereas the like-strangeness multiplicity {l angle}{ital n}{sub {Lambda}{Lambda}}+{bar {Lambda}}{bar {Lambda}}{r angle} is 0.009{plus minus}0.028. A strong correlation is found between {Lambda}'s and {bar {Lambda}} 's; when one is found in an event, the other is found in the same event with a probability that exceeds 50%.

Published
1992
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12. Upper limits onD±andB±decays to two leptons plusπ±orK±

Author

T. Schalk, J. Dorfan, A. M. Boyarski, P. Voruganti, Jordan Nash, S. Weisz, E. Soderstrom, A. Seiden, Kenneth G. Hayes, James Alexander, D.P. Coupal, Stephen Robert Wagner, D. Herrup, J. S. Haggerty, D. L. Burke, G. Hanson, S.L. White, B. W. LeClaire, D. Karlen, K. C. Moffeit, A. Baden, Darien Wood, E. Wicklund, Fordham C, Paul Sheldon, M. S. Gold, Walter R. Innes, T. Schaad, D. Hutchinson, B. D. Milliken, H. O. Ogren, M. Petradza, R. A. Ong, D. E. Dorfan, Clemens A. Heusch, A. J.R. Weinstein, J. Ballam, P. Weber, Ryszard Stroynowski, D. Fujino, Carl W. Akerlof, G. Bonvicini, D. Nitz, D. Y. Wu, R. Van Kooten, Burton Richter, B. B. Brabson, I. Juricic, P. Rankin, J. G. Smith, L. Gladney, M. Jaffré, George Gidal, A. Green, J. Hylen, D. Blockus, M. P. Alvarez, F. Bulos, H. F.W. Sadrozinski, J. Boyer, G. J. Feldman, F. Calviño, R. Tschirhart, E. Fernandez, D. P. Stoker, K. K. Gan, H. Veltman, R. J. Cence, N. S. Lockyer, D. Amidei, J. A. J. Matthews, Gerson Goldhaber, B. C. Barish, H. Schellman, W. Kozanecki, R. Harr, J. A. Kadyk, Cords D, F. Butler, A. S. Schwarz, Michael Levi, DeStaebler Hc, T. Glanzman, J. Kent, A. Breakstone, W. B. Schmidke, G. S. Abrams, G. H. Trilling, John Yelton, K. O'Shaughnessy, R. J. Hollebeek, Mark E. Nelson, A. Petersen, C.M. Hawkes, R. Frey, C. W. Peck, S. R. Klein, R. C. Field, D. R. Rust, R. R. Larsen, P. C. Rowson, Adolphsen Ce, L. Müller, J. W. Chapman, W. T. Ford, F. A. Harris, Sherwood Parker, Grosse-Wiesmann P, A. J. Weir, W. Koska, K. Riles, Timothy Barklow, Alan Litke, A. J. Lankford, John E. Bartelt, Patricia R. Burchat, J. A. Jaros, V. Luth, A. Snyder, Persis S. Drell, T. Himel, R. P. Thun, B. A. Barnett, D. I. Meyer, Frank C. Porter, and Jean-Marie Brom

Subjects
Nuclear physics, Semileptonic decay, Physics, Particle decay, Particle physics, Pion, Meson, Branching fraction, TheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITY, Leptoquark, B meson, Lepton
Abstract

Data taken by the Mark II detector at the SLAC {ital e}{sup +}{ital e}{sup {minus}} storage ring PEP was used to search for exclusive decays of {ital D}{sup {plus minus}} and {ital B}{sup {plus minus}} mesons into two charged leptons plus a charged pion or kaon. All possible charge and lepton combinations consistent with charge conservation were considered and no evidence for any signals was found. We obtain upper limits for the various branching ratios ranging from 2.5{times}10{sup {minus}3} to 9.2{times}10{sup {minus}3}, at a 90% confidence level. Some of these limits can be used to constrain leptoquark masses in various models.

Published
1990
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13. Quark hadronization probed by K0 mesons

Author

H. O. Ogren, L. E. Price, B. Cork, K. Sugano, P. Baringer, D. H. Miller, D. Errede, Carl W. Akerlof, D. Nitz, P. Kooijman, J. W. Chapman, C. R. Ng, M. Derrick, R. Tschirhart, K. Rangan, E. H. Low, M. T. Ken, C. K. Jung, J. M. Brom, D. I. Meyer, Jose Repond, H. A. Neal, R. Debonte, P. Kesten, R. L. McIlwain, A. Snyder, D. R. Rust, D. Blockus, S. Abachi, R. P. Thun, B. Musgrave, E. I. Shibata, B. B. Brabson, and Ben Bylsma

Subjects
Nuclear physics, Quark, Physics, Particle physics, Meson, Electron–positron annihilation, High Energy Physics::Phenomenology, High resolution, High Energy Physics::Experiment, Nuclear Experiment, Charged particle, Hadronization
Abstract

Total and differential ${K}^{0}$ corss sections are presented from ${e}^{+}{e}^{\ensuremath{-}}$ collisions at $\sqrt{s}=29$ GeV in the High Resolution Spectrometer detector. ${K}^{0}$ and charged-particle distributions are compared in a study of the hadronization of quarks of known flavor. Ecents of the reaction ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}c\overline{c}$ are tagged by identifying ${D}^{*}'\mathrm{s}$ while $u\overline{u}$, $d\overline{d}$, or $s\overline{s}$ events are tagged through the identification of a charged particle with fractional momentum near 1. Parton-shower models with cluster and string fragmentation are compared with these data. Also, certain particle scaling tests are performed using the quark-flavor tags. In addition, ${K}^{0}$ production in two- and three-jet events is compared to these models.

Published
1990

14. Charm quark production and fragmentation in e+e− annihilation at 29 GeV

Author

K. K. Gan, S. Kooijman, A. A. Seidl, P. Kesten, G. Baranko, J. P. Guillaud, L. Keller, M. Derrick, D. Blockus, F. J. Loeffler, R. Fries, D. I. Meyer, S. W. Gray, P. Kooijman, Harold Ogren, D. R. Rust, N. Harnew, S. Ahlen, P. Baringer, H. A. Neal, L. E. Price, R. P. Thun, R. Stevens, J. Va'vra, R. de Bonte, L. K. Rangan, L. Hyman, David Miller, Robert Wilson, M. Valdata-Nappi, J. Chapman, C. K. Jung, I. Beltrami, C. R. Ng, B. Musgrave, B. Cork, M. Willutzky, D. Rubin, J. Schlereth, D. E. Wood, Carl W. Akerlof, U. Mallik, K. Sugano, J.M. Weiss, J. S. Loos, E. I. Shibata, T. Trinko, D. Nitz, P. P. Ong, R. L. McIlwain, G. E. Forden, E. Fernandez, B. Brabson, D.S. Koltick, M. Daigo, and D. Errede

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Annihilation, Spectrometer, media_common.quotation_subject, Electron–positron annihilation, Electroweak interaction, Radiation, Asymmetry, Charm quark, Nuclear physics, Fragmentation (mass spectrometry), High Energy Physics::Experiment, media_common
Abstract

The electroweak production asymmetry and the decay fragmentation function for e + e − → c c have been measured at s = 29 GeV using charged D ∗ production over the full kinematic range. The data were taken at PEP using the High Resolution Spectrometer. The measured asymmetry is −0.12 ± 0.08. The total production cross section in units of the point cross section corrected for initial state radiation is R D ∗ = 2.7 ± 0.9 .

Published
1984
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15. Comparison of charged particle multiplicities in quark and gluon jets produced in e+e− annihilation at 29 GeV

Author

P. Kesten, M. Derrick, D. R. Rust, C. K. Jung, N. Harnew, D. I. Meyer, D. Nitz, D. H. Miller, D. Errede, E. H. Low, R. Debonte, J. Schlereth, M. Willutzky, R. P. Thun, P. Kooijman, D. E. Wood, C. R. Ng, F. J. Loeffler, S. W. Gray, B. G. Bylsma, R. L. McIlwain, S. Abachi, J. W. Chapman, Harold Ogren, B. Cork, B. B. Brabson, H. A. Neal, Carl W. Akerlof, K. Sugano, D.S. Koltick, M. Valdata-Nappi, B. Musgrave, P. Baringer, A. A. Seidl, J. S. Loos, J.M. Weiss, T. Trinko, G. Bonvicini, L. E. Price, L. K. Rangan, K. K. Gan, D. Blockus, I. Beltrami, and E. I. Shibata

Subjects
Quark, Physics, Nuclear and High Energy Physics, Particle physics, Annihilation, Spectrometer, High Energy Physics::Lattice, Electron–positron annihilation, High Energy Physics::Phenomenology, High resolution, Jet (particle physics), Charged particle, Gluon, Nuclear physics, High Energy Physics::Experiment, Nuclear Experiment, Astrophysics::Galaxy Astrophysics
Abstract

The charged particle multiplicities of the quark and gluon jets in the three-fold symmetric e+e- → qqg events at √s = 29 GeV have been studied using the high resolution spectrometer at PEP. A value of 〈n〉g = 6.7-2.1+1.1±1.0 for gluon jet s with an energy of 9.7-2.0+1.5 GeV is measured. The ratio, 〈n〉g/〈n〉q, is 1.29-0.41+0.21±0.20, which i s significantly lower than the value of 9 4 naively expected from the ration of the gluon-to-quark color charges. © 1985.

Published
1985
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16. Charged K∗ production in e+e− annihilations at 29 GeV

Author

C. K. Jung, H. A. Neal, Jose Repond, B. B. Brabson, D. Errede, B. G. Bylsma, R. Debonte, B. Musgrave, D. Blockus, R. Tschirhart, B. Cork, J. S. Loos, D. I. Meyer, J. M. Brom, H.W. Paik, D. H. Miller, H. O. Ogren, R. P. Thun, J. W. Chapman, K. Sugano, L. E. Price, C. R. Ng, D. R. Rust, E. I. Shibata, Carl W. Akerlof, R. L. McIlwain, P. Kooijman, S. Abachi, P. Baringer, M. T. Ken, M. Derrick, E. H. Low, D.S. Koltick, and D. Nitz

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Meson, Spectrometer, Electron–positron annihilation, Hadron, Multiplicity (mathematics), Nuclear physics, High Energy Physics::Experiment, Tensor, Nuclear Experiment, Event (particle physics), Storage ring
Abstract

We report a measurement of the charged K ∗ (892) production in e + e − annihilations at 29 GeV center-of-mass energy. The 300 pb −1 data sample used for this analysis is obtained with the High Resolution Spectrometer at the SLAC storage ring PEP. The total mean multiplicity is measured to be 〈n K ∗± (892) 〉=0.62±0.045±0.04 per hadronic event. Evidence is also given for the production of a charged K 2 ∗ (1430) tensor meson.

Published
1987
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17. Hadron production ine+e−annihilation at√s =29GeV

Author

L. Keller, D. R. Rust, P. P. Ong, D. Blockus, Harold Ogren, G. Bonvicini, L. E. Price, and R. J. Wilson, D. I. Meyer, B. G. Bylsma, L. K. Rangan, D. Rubin, R. L. McIlwain, S. Abachi, G. E. Forden, E. Fernandez, D. H. Miller, Carl W. Akerlof, N. Harnew, D.S. Koltick, B. B. Brabson, A. A. Seidl, E. I. Shibata, K. K. Gan, H. A. Neal, M. Daigo, D. Errede, R. P. Thun, S. Kooijman, S. W. Gray, J. Schlereth, M. Derrick, J. W. Chapman, J. Va’vra, F. J. Loeffler, B. Musgrave, E. H. Low, G. Baranko, C. K. Jung, B. Cork, K. Sugano, P. Kesten, R. de Bonte, D. Nitz, P. Baringer, M. Valdata-Nappi, R. Fries, L. G. Hyman, M. Willutzky, D. E. Wood, J. S. Loos, C. R. Ng, P. Kooijman, I. Beltrami, U. Mallik, J.M. Weiss, and T. Trinko

Subjects
Physics, Particle physics, Pion, Meson, Branching fraction, Electron–positron annihilation, Hadron, Quark model, Elementary particle, Lambda baryon
Abstract

Data from the High Resolution Spectrometer at the SLAC storage ring PEP have been used to study the inclusive production of baryons and mesons. Time-of-flight measurements are used to identify the charged hadrons. Neutral hadrons are identified from effective-mass peaks associated with their decay into two charged particles. Cross sections and other inclusive production characteristics are presented for ${\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}}$, ${K}^{\ifmmode\pm\else\textpm\fi{}}$, and ${K}^{0}$ (K${\ifmmode\bar\else\textasciimacron\fi{}}^{0}$) mesons, and for the baryons (antibaryons) p (p\ifmmode\bar\else\textasciimacron\fi{}) and \ensuremath{\Lambda} (\ensuremath{\Lambda}\ifmmode\bar\else\textasciimacron\fi{}). The ratio of the inclusive cross section to the point cross section for the ${K}^{0}$ and K${\ifmmode\bar\else\textasciimacron\fi{}}^{0}$ mesons is R(${K}^{0}$,K${\ifmmode\bar\else\textasciimacron\fi{}}^{0}$)=6.15\ifmmode\pm\else\textpm\fi{}0.13\ifmmode\pm\else\textpm\fi{}0.25, and for \ensuremath{\Lambda} and \ensuremath{\Lambda}\ifmmode\bar\else\textasciimacron\fi{}, R(\ensuremath{\Lambda},\ensuremath{\Lambda}\ifmmode\bar\else\textasciimacron\fi{})=0.846\ifmmode\pm\else\textpm\fi{}0.036\ifmmode\pm\else\textpm\fi{}0.085. The neutral-hadron differential cross sections are compared with the predictions of the Lund string model.

Published
1987
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18. Study of quark fragmentation ine+e−annihilation at 29 GeV: Global jet parameters and single-particle distributions

Author

M. Daigo, Robert Wilson, K. K. Gan, S. Kooijman, D.S. Koltick, H. A. Neal, D. H. Miller, P. Schreiner, R. Debonte, D. Bender, J. P. Guillaud, D. R. Rust, R. Stevens, D. Errede, D. I. Meyer, J. Schlereth, C. R. Ng, Carl W. Akerlof, P.T. Smith, D. Blockus, R. Klem, L. Keller, Harold Ogren, M. Valdata-Nappi, A. A. Seidl, P. Baringer, L. E. Price, J.M. Weiss, L. K. Rangan, F. J. Loeffler, F. Lopinto, N. Harnew, R. P. Thun, K. Jaeger, P. P. Ong, R. Singer, D. Rubin, J. Va’vra, R. Fries, G. Baranko, M. Willutzky, L. G. Hyman, S. P. Ahlen, T. Trinko, D. E. Wood, I. Beltrami, G. F. Gieraltowski, E. I. Shibata, U. Mallik, B. Cork, S. W. Gray, C. K. Jung, K. Sugano, J. S. Loos, J. W. Chapman, B. B. Brabson, M. Derrick, B. Musgrave, S. C. Ems, C. Ward, P. Kesten, P. Kooijman, D. Nitz, R. L. McIlwain, G. E. Forden, and E. Fernandez

Subjects
Quantum chromodynamics, Physics, Quark, Nuclear physics, Particle physics, Annihilation, Electron–positron annihilation, Isospin, Quark model, Hadron, Elementary particle
Abstract

In this paper, results are presented from a study of the hadronic final states in e/sup +/e/sup -/ annihilation at 29 GeV. The data were obtained with the High Resolution Spectrometer (HRS) at the SLAC PEP e/sup +/e/sup -/ colliding-beam facility. The results are based on 6342 selected events corresponding to an integrated luminosity of 19.6 pb/sup -1/. The distributions of the events in sphericity (S), thrust (T), and aplanarity (A) are given and compared to other e/sup +/e/sup -/ data in the same energy range. We measure = 0.130 +- 0.003 +- 0.010 and = 0.100 +- 0.002. The sphericity distribution is compared to sphericity measurements made for beam jets in hadronic collisions as well as jets studied in neutrino scattering. The data sample is further reduced to 4371 events with the two-jet selections, S< or =0.25 and A< or =0.1. The single-particle distributions in the longitudinal and transverse directions are given. For low values of the momentum fraction (z = 2p/W), the invariant distribution shows a maximum at zapprox.0.06, consistent with a QCD expectation. The data at high Feynman x (x/sub F/) show distribution consistent with being dominated by a (1-x/sub f/)/sup 2/ variation for themore » leading quark-meson transition. The rapidity distribution shows a shallow central minimum with a height (1/N/sub e//sub v/dN/sup h//dYVertical Bar= 0 = 2.3 +- 0.02 +- 0.07.« less Authors: Bender, D. ; Derrick, M. ; Fernandez, E. ; Fries, R. ; Gieraltowski, G. ; Hyman, L. ; Jaeger, K. ; Klem, R. ; Kooijman, P. ; Loos, J.S. ; LoPinto, F. ; Musgrave, B. ; Price, L.E. ; Schlereth, J. ; Schreiner, P. ; Singer, R. ; Sugano, K. ; Trinko, T. ; Valdata-Nappi, M. ; Ward, C. more »; Weiss, J.M. ; Ahlen, S. ; Baranko, G. ; Baringer, P. ; Blockus, D. ; Brabson, B. ; Daigo, M. ; Ems, S. ; Forden, G.E. ; Gray, S.W. ; Guillaud, J. ; Jung, C. ; Neal, H. ; Ogren, H. ; Rust, D. ; Smith, P. ; Akerlof, C. ; Chapman, J. ; Errede, D. ; Harnew, N. ; Kesten, P. ; Kooijman, S. ; Meyer, D.I. ; Nitz, D. ; Rubin, D. ; Seidl, A.A. ; Thun, R. ; Willutzky, M. ; Beltrami, I. ; DeBonte, R. ; Gan, K.K. ; Koltick, D. ; Loeffler, F. ; Mallik, U. ; McIlwain, R. ; Miller, D.H. ; Ng, C.R. ; Ong, P.P. ; Rangan, L.K. ; Shibata, E.I. ; Stevens, R. ; Wilson, R.J. ; Wood, D.E. ; Cork, B. ; Keller, L. ; Va'vra, J. « less Publication Date:1985-01-01 OSTI Identifier:6247594 Resource Type:Journal Article Resource Relation:Journal Name: Phys. Rev. D; (United States); Journal Volume: 31:1 Research Org:Argonne National Laboratory, Argonne, Illinois 60439 Country of Publication:United States Language:English Subject: 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; HADRONS; ISOSPIN; MASS; QUARKS; EIGENSTATES; FLAVOR MODEL; QUANTUM CHROMODYNAMICS; S WAVES; SPIN; SU-3 GROUPS; SYMMETRY BREAKING; ANGULAR MOMENTUM; COMPOSITE MODELS; ELEMENTARY PARTICLES; FIELD THEORIES; LIE GROUPS; MATHEMATICAL MODELS; PARTIAL WAVES; PARTICLE MODELS; PARTICLE PROPERTIES; POSTULATED PARTICLES; QUANTUM FIELD THEORY; QUARK MODEL; SU GROUPS; SYMMETRY GROUPS 645204* -- High Energy Physics-- Particle Interactions & Properties-Theoretical-- Strong Interactions & Properties

Published
1985
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19. Measurement of the lifetime of hadrons containing the b-quark

Author

R. P. Thun, R. Debonte, L. E. Price, L. K. Rangan, R. L. McIlwain, S. Abachi, M. T. Ken, D. Nitz, K. K. Gan, B. Cork, Carl W. Akerlof, J. M. Brom, C. K. Jung, P. Kooijman, D. Errede, D. Blockus, M. Derrick, J. S. Loos, K. Sugano, E. H. Low, D. R. Rust, C. R. Ng, H.W. Paik, J. W. Chapman, Harold Ogren, F. J. Loeffler, D.S. Koltick, E. I. Shibata, P. Baringer, B. G. Bylsma, D. I. Meyer, J. Repond, D. H. Miller, B. B. Brabson, R. Tschirart, and B. Musgrave

Subjects
Physics, Quark, Semileptonic decay, Nuclear and High Energy Physics, Particle physics, Annihilation, High Energy Physics::Phenomenology, Hadron, Electroweak interaction, Bottom quark, Standard Model, Nuclear physics, High Energy Physics::Experiment, Impact parameter
Abstract

Data collected with the High Resolution Spectrometer at PEP, corresponding to an integrated luminosity of 200 pb- 1 ofe+e annihilation at 29 GeV, were used to measure the mean hfetlme of hadrons containing the bottom quark. The hfetlme was determined using the impact parameter method on events containing a high-transverse-momentum electron The result, based on a sample of 301 events, is vB = 102~039042 ps, where the Indicated errors include both statistics and systematlcs In the context of the standard model, the lifetime of hadrons containing a bottom quark is determined by the electroweak coupling between the b and the c and u quarks. In the Kobayashi-Maskaw a scheme, the lifetime constrains the values of the matrix elements [ Vbc [ and ] Vbu [ [ 11. This letter presents a measurement of the lifetime of a mixture of hadrons containing the b-quark. The data sample consists of e+e---}bb annihilations at x/~=29 GeV, tagged by a high-PT electron coming from the semileptonic decay of the b-quark. Two different analysis techniques are used, but the quoted result is based on a maximum likelihood fit to the measured impact parameter distribution. A detailed description of the High Resolution Spectrometer can be found elsewhere [2]. For this analysis, the tracking system is essential. It consists

Published
1987
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20. Experimental limits on massive neutrinos frome+e−annihilations at 29 GeV

Author

H. O. Ogren, E. I. Shibata, J. W. Chapman, L. E. Price, L. K. Rangan, D. Blockus, D. H. Miller, D. Nitz, J. M. Brom, R. Tschirhart, H.W. Paik, C. K. Jung, Jose Repond, D. Errede, B. G. Bylsma, R. L. McIlwain, S. Abachi, P. Kooijman, J. S. Loos, M. Derrick, P. Baringer, E. H. Low, Carl W. Akerlof, B. B. Brabson, D.S. Koltick, M. T. Ken, D. R. Rust, B. Cork, K. Sugano, D. I. Meyer, H. A. Neal, R. Debonte, R. P. Thun, C. R. Ng, and B. Musgrave

Subjects
Nuclear physics, Massless particle, Physics, Particle physics, Particle decay, Muon, Meson, Neutrino detector, Branching fraction, High Energy Physics::Experiment, Neutrino, Lepton
Abstract

A search was made with the High Resolution Spectrometer at PEP for events with an isolated pair of charged tracks e/sup + -/X/sup - +/ where X is a muon or meson. Such pairs are a possible signature for the decay of massive neutrinos. Only one event was found, for a integrated luminosity of 300 pb/sup -1/, satisfying certain selection criteria and with a mass m/sub ex/ > 1.8 GeV. This result places strong constraints on the existence of new neutrinos with masses from 1.8 to 6.7 GeV and with mixing parameters to the known neutrinos in the range 10/sup -6/ < absolute value of U/sup 2/ < 1. 12 refs., 6 figs.

Published
1988
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21. Search for B-decay to Higgs bosons for Higgs boson masses between 50 and 210 MeV/c2

Author

Abraham Seiden, George H. Trilling, D. Nitz, D. Y. Wu, B. D. Milliken, A. S. Schwarz, Gerson Goldhaber, J. Dorfan, P. Voruganti, J. Hylen, R. J. Hollebeek, J. M. Brom, E. Wicklund, A. J. Lankford, Clemens A. Heusch, K. K. Gan, D. I. Meyer, N. S. Lockyer, R. Van Kooten, D. Herrup, A. Petersen, P. Weber, M. Jaffre, S. L. White, Patricia R. Burchat, J. A. Kadyk, A. M. Boyarski, D. Hutchinson, J. A. J. Matthews, E. Soderstrom, F. Butler, Jordan Nash, G. J. Feldman, S. R. Klein, M. S. Gold, S. Weisz, P. Rankin, F. Calviño, B. B. Brabson, K. O'Shaughnessy, C. W. Peck, W. N. Murray, F. Bulos, H. Veltman, A. Breakstone, H. O. Ogren, Grosse-Wiesmann P, Darien Wood, K. Riles, W. Kozanecki, Fordham C, George Gidal, Carl W. Akerlof, Burton Richter, G. Bonvicini, D. Blockus, R. Frey, V. Luth, M. Petradza, R. A. Ong, W. Koska, Frank C. Porter, W. B. Schmidke, J. R. Smith, D. P. Stoker, G. Hanson, Cence Rj, D. L. Burke, A.J. Weinstein, T. Himel, A. J. Weir, D. Amidel, T. Schaad, M. Alvarez, Timothy Barklow, R. Harr, Alan Litke, Adolphsen Ce, J. Haggerty, G. S. Abrams, Cords D, Michael Levi, J. M. Yelton, H. Schellman, C.M. Hawkes, A. R. Baden, D. E. Dorfan, L. Müller, J. W. Chapman, F.A. Harris, R. R. Larsen, Ryszard Stroynowski, D. Fujino, H. F.W. Sadrozinski, T. Schalk, J.P. Alexander, R. Tschirhart, William T. Ford, P. C. Rowson, Glanzman T, J. Boyer, B. W. Leclaire, Sherwood Parker, A. Snyder, Mark E. Nelson, B. A. Barnett, L. Gladney, B. C. Barish, I. Juricic, D. R. Rust, R. P. Thun, Bartelt J, J. Kent, Field Rc, P. D. Sheldon, P.S. Drell, D. Karlen, DeStaebler Hc, J. A. Jaros, M. L. Perl, Walter R. Innes, Kenneth G. Hayes, E. Fernandez, D.P. Coupal, Stephen Robert Wagner, and K. C. Moffeit

Subjects
Physics, Nuclear and High Energy Physics, Gauge boson, Particle physics, High Energy Physics::Phenomenology, Higgs sector, Vector boson, Standard Model, Nuclear physics, symbols.namesake, Higgs field, symbols, Higgs boson, High Energy Physics::Experiment, Higgs mechanism, Boson
Abstract

We use data from the Mark II experiment at PEP to search for the process B→h 0 X for m h 0 between 50 and 210 MeV/ c 2 . No evidence for the Higgs boson is seen in this mass range. The limit obtained rules out the standard Higgs boson for masses between 70 and 210 MeV/ c 2 and significantly constrains extensions of the Higgs sector.

Published
1989
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22. Measurement of the D0? K-?+Branching Fraction

Author

D. R. Rust, Carl W. Akerlof, d R. L. McILWAIN, C. K. Jung, M. T. Ken, D. R. Debonte, S. Abachi, R. P. Thun, D. H. Miller, B. G. Bylsma, H. O. Ogren, R. Tschirhart, B. Cork, Jose Repond, D. Errede, L. E. Price, J. W. Chapman, J. M. Brom, K. Sugano, D.S. Koltick, P. Baringer, M. Derrick, A. Snyder, E. H. Low, D. Blockus, D. I. Meyer, E. I. Shibata, J. S. Loos, B. B. Brabson, C. R. Ng, B. Musgrave, P. Kooijman, and D. Nitz

Subjects
Physics, Branching (linguistics), Particle physics, History and Philosophy of Science, General Neuroscience, General Biochemistry, Genetics and Molecular Biology
Published
1988
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23. Determination ofαsfrom energy-energy correlations ine+e−annihilation at 29 GeV

Author

J. S. Haggerty, C. A. Heusch, R. Van Kooten, W. Koska, Darien Wood, B. A. Barnett, L. Golding, R. Tschirhart, Kenneth G. Hayes, A. J. Lankford, J. A. Kadyk, D.P. Coupal, Stephen Robert Wagner, S. L. White, Timothy Barklow, P. S. Drell, D. L. Burke, R. Harr, H. O. Ogren, J. A. Jaros, F. Calviño, A. S. Schwarz, Ryszard Stroynowski, M. Petradza, R. A. Ong, D. Fujino, G. Bonvicini, J. P. Alexander, M. L. Perl, I. Juricic, DeStaebler Hc, B. C. Barish, A. Green, R. R. Larsen, P. Rankin, Alan Litke, R. J. Hollebeek, G. S. Abrams, H. F.W. Sadrozinski, A. Snyder, J. M. Brom, J. W. Chapman, D. Karlen, W. B. Schmidke, T. Schalk, G. J. Feldman, R. Frey, D. Nitz, D. Y. Wu, D. Amidei, T. Schaad, R. P. Thun, D. Hutchinson, W. T. Ford, J. Hylen, Gerson Goldhaber, H. Schellman, M. Alvarez, L. Müller, E. Fernandez, B. B. Brabson, Adolphsen Ce, J. A. J. Matthews, W. Kozanecki, Mark E. Nelson, P. R. Burchat, J. Kent, Z. Li, B. D. Milliken, D. I. Meyer, Grosse-Wiesmann P, A. Petersen, E. Wicklund, K. K. Gan, P. C. Rowson, B. W. Leclaire, J. G. Smith, F. A. Harris, D. R. Rust, A. Koide, P. Weber, John E. Bartelt, D. Herrup, A. Seiden, F. Butler, K. Riles, D. P. Stoker, M. E. Levi, P. Voruganti, T. Glanzman, R. C. Field, K.C. Moffeit, Jordan Nash, J. Boyer, W. R. Innes, M. Hoenk, F. Bulos, F. C. Porter, J. Ballam, M. Jaffré, Burton Richter, C. De La Vaissiere, D. Blockus, V. Luth, S. Weisz, R. J. Cence, George Gidal, Larry D. Gladney, P. D. Sheldon, Carl W. Akerlof, Cords D, A. J. Weinstein, Sherwood Parker, G. Hanson, C. Matteuzzi, A. Baden, K. O'Shaughnessy, C. W. Peck, J. Dorfan, John Yelton, A. M. Boyarski, S. R. Klein, C. M. Hawkes, G. H. Trilling, E. Soderstrom, N. S. Lockyer, A. J. Weir, T. Himel, Fordham C, A. Breakstone, D. E. Dorfan, M. S. Gold, and H. Veltman

Subjects
Quantum chromodynamics, Coupling constant, Nuclear physics, Physics, Particle physics, Annihilation, Electron–positron annihilation, Quark model, Hadron, High Energy Physics::Experiment, Nuclear Experiment, Storage ring, Hadronization
Abstract

We have studied the energy-energy correlation in e+e- annihilation into hadrons at s =29 GeV using the Mark II detector at the SLAC storage ring PEP. We find to O(s2) that s=0.1580.0030.008 if hadronization is described by string fragmentation. Independent fragmentation schemes give s=0.100.14, and give poor agreement with the data. A leading-log shower fragmentation model is found to describe the data well. © 1988 The American Physical Society.

Published
1988
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24. Precision test of QED by direct comparison of e+e− → γγ and e+e− → e+e− at 29 GeV

Author

K. K. Gan, R. P. Thun, M. Valdata-Nappi, D. H. Miller, Carl W. Akerlof, H. A. Neal, B. Cork, D. Errede, J. Schlereth, C. R. Ng, B. Musgrave, H. O. Ogren, P. Baringer, K. Sugano, G. Bonvicini, L. E. Price, D. Nitz, N. Harnew, L. K. Rangan, J. W. Chapman, D. Blockus, J. S. Loos, P. Kesten, A. A. Seidl, D.S. Koltick, F. J. Loeffler, J.M. Weiss, D. I. Meyer, D. R. Rust, C. K. Jung, T. Trinko, S. W. Gray, P. Kooijman, R. Debonte, R. L. McIlwain, I. Beltrami, S. Abachi, E. I. Shibata, B. B. Brabson, M. Willutzky, M. Derrick, D. E. Wood, E. H. Low, and B. G. Bylsma

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Astrophysics::High Energy Astrophysical Phenomena, Electron–positron annihilation, High Energy Physics::Experiment, Polar coordinate system, Nuclear Experiment
Abstract

The ratio of differential cross sections for the reactions e+e− → γγ and e+e− → e+e− is measured at s = 29 GeV in the central polar angle region, |cos θ| 59 GeV and Λ- > 59 GeV.

Published
1986
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25. InclusiveD0andD+Production ine+e−Annihilation at 29 GeV

Author

L. E. Price, U. Mallik, L. K. Rangan, J.M. Weiss, M. Derrick, D. Nitz, T. Trinko, J. Va'vra, P. Kesten, D. Blockus, K. K. Gan, S. Kooijman, M. Willutzky, B. Cork, Robert Wilson, P. P. Ong, C. K. Jung, D. E. Wood, N. Harnew, C. R. Ng, J. P. Guilluad, S. W. Gray, D. I. Meyer, R. Stevens, R. Fries, R. P. Thun, G. Baranko, S. P. Ahlen, I. Beltrami, L. G. Hyman, E. I. Shibata, F. J. Loeffler, Harold Ogren, P. Baringer, K. Sugano, Carl W. Akerlof, D. Rubin, M. Valdata-Nappi, J. S. Loos, D. R. Rust, A. A. Seidl, H. A. Neal, Jeremy R. Chapman, R. Debonte, B. Musgrave, L. Keller, B. Brabson, D. Errede, R. L. McIlwain, G. E. Forden, E. Fernandez, M. Daigo, D.S. Koltick, D. H. Miller, J. Schlereth, and P. Kooijman

Subjects
Quark, Nuclear physics, Physics, Particle physics, Annihilation, Meson, media_common.quotation_subject, General Physics and Astronomy, Charge (physics), Production (computer science), Asymmetry, media_common
Abstract

We have observed inclusive production of D0 and D+ mesons, and their charge conjugates, in e+e− annihilation at 29 GeV on the basis of a data sample of 106 pb−1. These signals correspond to R values of R(D0+D―0)=1.8±0.5 and R(D++D−)=1.2±0.4. Taking the D+ and D0 data together, we measure a charge asymmetry of A=−0.08±0.12 for charmed quarks. A comparison of R(D+D―) with R(D*+D―*) obtained via the process D*+→D0π+ gives a DD* ratio of 1.0−0.2+0.3, indicating that direct D* production dominates over direct D production.

Published
1984
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26. Measurement of the reaction e+e− → τ+τ− at √s = 29 GeV

Author

F. J. Loeffler, B. G. Bylsma, Robert Wilson, N. Harnew, S. W. Gray, C. K. Jung, A. A. Seidl, P. Baringer, B. Musgrave, H. A. Neal, B. Cork, C. R. Ng, J. S. Loos, D. Rubin, R. Fries, M. Willutzky, M. Derrick, J. W. Chapman, P. Kesten, L. G. Hyman, E. H. Low, D.S. Koltick, D. E. Wood, R. L. McIlwain, K. Sugano, G. E. Forden, E. Fernandez, R. Debonte, D. I. Meyer, D. R. Rust, P. Kooijman, B. B. Brabson, G. Baranko, D. Nitz, M. Valdata-Nappi, J. Va’vra, R. P. Thun, K. K. Gan, S. Kooijman, L.P. Keller, H. O. Ogren, G. Bonvicini, L. E. Price, Carl W. Akerlof, L. K. Rangan, P. P. Ong, D. Errede, D. H. Miller, I. Beltrami, J. Schlereth, E. I. Shibata, D. Blockus, J.M. Weiss, and T. Trinko

Subjects
Coupling, Physics, Nuclear and High Energy Physics, Particle physics, Spectrometer, media_common.quotation_subject, Electroweak interaction, High resolution, Asymmetry, Standard Model, Nuclear physics, Angular distribution, Cutoff, High Energy Physics::Experiment, Astrophysics::Earth and Planetary Astrophysics, media_common
Abstract

The reaction e+e- → τ+τ- has been measured using the high resolution spectrometer at PEP. The angular distribution shows a forward-backward asymmetry of -(6.1±2.3±0.5)%, corresponding to an axial-vector coupling if gaτgae = 0.28 ±0.11± 0.03, in good agreement with the standard model of electroweak interactions. The measured cross section yields ifRττ = 1.10± 0.03±0.04, consistent with QED and giving QED cutoff parameters of Λ+>92 GeV and Λ->246 GeV at 95% C.L. © 1985.

Published
1985
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27. Study of vector-meson production ine+e−annihilation ats=29GeV

Author

H. A. Neal, R. Tschirhart, Ben Bylsma, C. R. Ng, R. Debonte, M. T. Ken, Jose Repond, C. K. Jung, Carl W. Akerlof, B. B. Brabson, P. Kooijman, J. W. Chapman, D. Nitz, D.S. Koltick, M. Derrick, B. Musgrave, E. H. Low, D. H. Miller, R. L. McIlwain, Waschbusch P, P. Baringer, J. M. Brom, E. I. Shibata, D. Blockus, D. Errede, D. R. Rust, B. Cork, K. Sugano, S. Abachi, R. P. Thun, H. O. Ogren, L. E. Price, and D. I. Meyer

Subjects
Physics, Nuclear physics, Particle physics, Annihilation, Meson, Mechanical fragmentation, TheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITY, Hadron, High resolution, Multiplicity (mathematics), Vector meson
Abstract

This paper reports cross-section measurements for the /rho//sup 0/ and /ital K//sup */(890) vector mesons produced in /ital e//sup +/e/sup /minus// annihilation at /radical//ital s/ =29 GeV. The data, which were taken with the High Resolution Spectrometer operating at the SLAC colliding-beam facility PEP,correspond to an integrated luminosity of 291 pb/sup /minus/1/. The measured multiplicities for fractional momentum /ital x//gt/0.05 are /ital N//sub /rho//sup 0//=0.79/plus minus/0.04 and /ital N//sub /ital K//sup *0/(890)/=0.53/plus minus/0.04. The measured fragmentation functions agree well with the predictions of the Lund model and when extrapolated to threshold, the corresponding total multiplicities are /ital N//sub /rho//sup 0//=0.90/plus minus/0.05 and /ital N//sub /ital K//sup *0/(890)/=0.59/plus minus/0.05.

Published
1989
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28. Multihadronic events atEc.m.=29 GeV and predictions of QCD models fromEc.m.=29 GeV toEc.m.=93 GeV

Author

B. W. Leclaire, Cords D, John Yelton, Jordan Nash, C. A. Heusch, K. K. Gan, S. Weisz, L. Golding, K. O'Shaughnessy, W. Koska, C. W. Peck, T. Schalk, D. Herrup, E. Fernandez, A. J. Weir, R. J. Hollebeek, Kenneth G. Hayes, P. Voruganti, R. Harr, J. S. Haggerty, D. R. Rust, E. Soderstrom, R. C. Field, K.C. Moffeit, Sherwood Parker, E. Wicklund, Fordham C, Larry D. Gladney, A. Breakstone, R. Frey, C. De La Vaissiere, Darien Wood, B. A. Barnett, Adolphsen Ce, Timothy Barklow, Alan Litke, A. Koide, P. Weber, J. A. Jaros, A. J. Weinstein, John E. Bartelt, M. E. Levi, D.P. Coupal, J. W. Chapman, Stephen Robert Wagner, M. Petradza, R. A. Ong, C. M. Hawkes, A. Snyder, A. Petersen, J. A. J. Matthews, W. Kozanecki, H. O. Ogren, P. S. Drell, D. Amidei, T. Himel, R. R. Larsen, G. S. Abrams, B. B. Brabson, F. Bulos, Ryszard Stroynowski, D. Fujino, M. S. Gold, A. Green, W. T. Ford, A. Seiden, F. Butler, P. Rankin, N. S. Lockyer, DeStaebler Hc, A. S. Schwarz, G. Bonvicini, George Gidal, J. P. Alexander, Mark E. Nelson, F. Calviño, M. Jaffré, M. L. Perl, H. F.W. Sadrozinski, Gerson Goldhaber, I. Juricic, H. Schellman, H. Veltman, R. J. Cence, Z. Li, J. Boyer, Carl W. Akerlof, D. I. Meyer, B. D. Milliken, Grosse-Wiesmann P, F. A. Harris, T. Glanzman, R. Tschirhart, K. Riles, M. Hoenk, S. L. White, D. Nitz, D. Y. Wu, P. D. Sheldon, J. Ballam, J. Hylen, R. Van Kooten, P. R. Burchat, R. P. Thun, D. P. Stoker, A. J. Lankford, B. C. Barish, D. Karlen, J. Kent, Burton Richter, D. Blockus, J. Dorfan, A. M. Boyarski, S. R. Klein, L. Müller, G. J. Feldman, D. L. Burke, T. Schaad, M. Alvarez, W. R. Innes, F. C. Porter, J. A. Kadyk, W. B. Schmidke, G. Hanson, C. Matteuzzi, A. Baden, G. H. Trilling, J. M. Brom, D. Hutchinson, J. G. Smith, D. E. Dorfan, and P. C. Rowson

Subjects
Nuclear physics, Physics, Quantum chromodynamics, Particle physics, Annihilation, Electron–positron annihilation, Hadron, High Energy Physics::Experiment, Elementary particle, Parton, Rapidity, Hadronization
Abstract

Multihadronic e/sup +/e/sup -/ annihilation events at a center-of-mass energy of 29 GeV have been studied with both the original (PEP 5) Mark II and the upgraded Mark II detectors. Detector-corrected distributions from global shape analyses such as aplanarity, Q/sub 2/-Q/sub 1/, sphericity, thrust, minor value, oblateness, and jet masses, and inclusive charged-particle distributions including x, rapidity, p/sub perpendicular/, and particle flow are presented. These distributions are compared with predictions from various multihadron event models which use leading-logarithmic shower evolution or QCD matrix elements at the parton level and string or cluster fragmentation for hadronization. The new generation of parton-shower models gives, on the average, a better description of the data than the previous parton-shower models. The energy behavior of these models is compared to existing e/sup +/e/sup -/ data. The predictions of the models at a center-of-mass energy of 93 GeV, roughly the expected mass of the Z/sup 0/, are also presented.

Published
1988
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29. Evidence for the decay

Author

J. S. Loos, D.S. Koltick, R. L. McIlwain, S. Abachi, H. O. Ogren, D. Errede, L. E. Price, D. Blockus, L. K. Rangan, B. B. Brabson, P. Baringer, B. Cork, M. Derrick, E. H. Low, Jose Repond, D. Nitz, K. Sugano, D. H. Miller, E. I. Shibata, R. P. Thun, J. M. Brom, J. W. Chapman, C. K. Jung, C. R. Ng, B. Musgrave, R. Tschirhart, D. R. Rust, B. G. Bylsma, H. A. Neal, P. Kooijman, F. J. Loeffler, R. Debonte, Carl W. Akerlof, and M. T. Ken

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Spectrometer, Meson, Branching fraction, Isospin, High resolution, High Energy Physics::Experiment, Parity (physics), Storage ring, Lepton
Abstract

The inclusive production of η mesons in tau lepton decay has been studied using the High Resolution Spectrometer at the PEP e + e - facility. The data sample corresponds to an integrated luminosity of 300 pb −1 and the storage ring was operated at GeV. The η production appeaars to be only compatible with the decay τ + →π + η ν , which violates isospin and G -parity conservation. The branching ratio of 5.1±1.5% explains much of the current discrepancy between the one-prong topological branching ratio and the sum of the individual one-prong modes.

Published
1987
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30. Study of quark fragmentation ine+e−annihilation at 29 GeV: Charged-particle multiplicity and single-particle rapidity distributions

Author

D. Errede, K. K. Gan, B. Musgrave, S. W. Gray, J. W. Chapman, Harold Ogren, E. I. Shibata, Carl W. Akerlof, M. Willutzky, J. S. Loos, N. Harnew, M. Valdata-Nappi, C. R. Ng, R. L. McIlwain, G. Bonvicini, L. E. Price, S. Abachi, L. K. Rangan, H. A. Neal, R. Debonte, P. Kooijman, D. E. Wood, F. J. Loeffler, B. B. Brabson, P. Baringer, B. G. Bylsma, D. H. Miller, M. Derrick, E. H. Low, D. Nitz, P. Kesten, J. Repond, J. Schlereth, D. R. Rust, B. Cork, D. I. Meyer, K. Sugano, R. P. Thun, C. K. Jung, G. Baranko, A. A. Seidl, D. Blockus, U. Mallik, J.M. Weiss, T. Trinko, I. Beltrami, and J. M. Brom

Subjects
Nuclear physics, Physics, Particle physics, Annihilation, Hadron, Multiplicity (mathematics), Rapidity, Elementary particle, Inelastic scattering, Charged particle, Sphericity
Abstract

This paper presents the charged-particle multiplicity distributions for e/sup +/e/sup -/ annihilation at ..sqrt..s = 29 GeV measured in the High Resolution Spectrometer. The data, which correspond to an integrated luminosity of 185 pb/sup -1/, were obtained at the SLAC e/sup +/e/sup -/ storage ring PEP. The techniques used to correct the observed prong numbers are discussed. The multiplicity distribution of the charged particles has a mean value = 12.87 +- 0.03 +- 0.30, a dispersion D/sub 2/ = 3.67 +- 0.02 +- 0.18, and an f/sub 2/ moment of 0.60 +- 0.02 +- 0.18. Results are also presented for a two-jet sample selected with low sphericity and aplanarity. The charged-particle distributions are almost Poissonian and narrower than have been reported by other e/sup +/e/sup -/ experiments in this energy range. The mean multiplicity increases with the event sphericity, and for the sample of threefold-symmetric three-jet events, a value of = 16.3 +- 0.3 +- 0.7 is found. No correlation is observed between the multiplicities in the two hemispheres when the events are divided into two jets by a plane perpendicular to the thrust axis. This result is in contrast with the situation in soft hadronic collisions, where a strongmore » forward-backward correlation is measured. For the single jets, a mean multiplicity of 6.43 +- 0.02 +- 0.15 and a dispersion value of D/sub 2/ = 2.55 +- 0.02 +- 0.13 are found. These values give further support to the idea of independent jet fragmentation. The multiplicity distributions are well fit by the negative-binomial distribution.« less

Published
1986
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31. A description of drift chambers used in a Fermilab experiment

Author

K. Stanfield, D. D. Yovanovitch, F. J. Loeffler, D. Bintinger, D. A. Finley, Carl W. Akerlof, D. Koltick, W. R. Ditzler, R. Lundy, P. Alley, R. P. Thun, R. L. Loveless, E. I. Shibata, M. Zumberge, and D. I. Meyer

Subjects
Physics, Nuclear physics, Particle physics, Physics::Instrumentation and Detectors, High Energy Physics::Experiment, General Medicine, Charm (quantum number), Fermilab, GeneralLiterature_MISCELLANEOUS
Abstract

We give a detailed description of the drift chamber system used in a charm search at Fermilab. All important aspects of design and performance are discussed.

Published
1976
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32. Production and fragmentation of the D∗0 meson in e+e− annihilations at √s=29 GeV

Author

B. G. Bylsma, B. Cork, C. K. Jung, K. Sugano, D. R. Rust, Jose Repond, M. Derrick, E. H. Low, P. Kooijman, Carl W. Akerlof, D. E. Wood, K. K. Gan, F. J. Loeffler, B. B. Brabson, D. Errede, R. L. McIlwain, D. I. Meyer, S. Abachi, P. Kesten, C. R. Ng, R. Debonte, P. Baringer, J. S. Loos, D.S. Koltick, R.T. Thun, J. W. Chapman, A. A. Seidl, J. M. Brom, D. Nitz, D. H. Miller, B. Musgrave, H. O. Ogren, L. E. Price, L. K. Rangan, D. Blockus, J.M. Weiss, and E. I. Shibata

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Annihilation, Meson, Branching fraction, Hadron, Elementary particle, Baryon, Nuclear physics, Particle decay, Pion, High Energy Physics::Experiment, Nuclear Experiment
Abstract

Neutral D∗ meson production in e+e− annihilation at √s=29 GeV has been studied using the high resolution spectrometer. The decay of D∗0 into D0γ, where the D0 decays into K−π+, has been observed. The production cross section in units of the point cross section is 0.63±0.22 for fractional energy Z⩾0.5. The fragmentation function is compared with that of the D∗+ meson measured in the same experiment.

Published
1987
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33. Asymmetry in the angular distribution of inclusive ∧ baryons from e+e− annihilations at GeV

Author

J.M. Weiss, B. Cork, R. P. Thun, K. Sugano, B. B. Brabson, A. A. Seidl, D. R. Rust, C. K. Jung, Carl W. Akerlof, R. L. McIlwain, S. Abachi, Jose Repond, J. S. Loos, M. Derrick, D. H. Miller, D. Blockus, E. H. Low, P. Kesten, P. Kooijman, B. Musgrave, P. Baringer, J. W. Chapman, D. I. Meyer, E. I. Shibata, D.S. Koltick, D. Nitz, F. J. Loeffler, B. G. Bylsma, H. A. Neal, K. K. Gan, J. M. Brom, H. O. Ogren, L. E. Price, L. K. Rangan, R. Debonte, M. Willutzky, D. E. Wood, C. R. Ng, and D. Errede

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Annihilation, media_common.quotation_subject, Hadron, Hyperon, Elementary particle, Fermion, Lambda baryon, Asymmetry, Baryon, Nuclear physics, High Energy Physics::Experiment, media_common
Abstract

A forward-backward asymmetry A, consistent with that expected from the γ−Z0 interference term in the process e + e − → q q , is observed in the laboratory production angular distribution of high-momentum ∧ baryons. The data were collected with the High Resolution Spectrometer at PEP. The asymmetry for ∧ baryons with fractional energy z= 2E s greater than 0.3 is A = (−23± 8plusmn; 2)%.

Published
1986
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34. Measurement ofϕProduction in Proton-Nucleus Collisions at 400 GeV/c

Author

D. Koltick, P. Alley, Carl W. Akerlof, R. P. Thun, D. A. Finley, W. R. Ditzler, F. J. Loeffler, R. L. Loveless, K. C. Stanfield, D. D. Yovanovitch, D. Bintinger, D. I. Meyer, O. E. Johnson, and E.I. Shibata

Subjects
Physics, Nuclear reaction, Particle physics, Meson, Hadron, General Physics and Astronomy, Elementary particle, Spectral line, Nuclear physics, symbols.namesake, Mass spectrum, symbols, Feynman diagram, Nuclear Experiment, Boson
Abstract

We have measured the invariant cross section for inclusive phi production in proton-nucleus collisions at 400 GeV/c near Feynman chi = 0. For transverse momenta in the range between 0.8 and 3.5 GeV/c the ratio of the phi to ..pi../sup -/ rises from 1 to 7%. We also report on correlations with particles opposite the phi in the center-of-mass system as they relate to the Okubo-Zweig-Iizuka rule.

Published
1977
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35. Observation of Tensor and Scalar Mesons Produced ine+e−Annihilation at 29 GeV

Author

D. H. Miller, P. Kooijman, M. Derrick, D. R. Rust, H. O. Ogren, C. K. Jung, E. H. Low, D. Blockus, D. Errede, L. E. Price, Carl W. Akerlof, D. Nitz, L. K. Rangan, M. Willutzky, F. J. Loeffler, B. G. Bylsma, Jose Repond, R. P. Thun, P. Baringer, J.M. Weiss, B. Musgrave, K. K. Gan, A. A. Seidl, J. S. Loos, J. M. Brom, C. R. Ng, R. Debonte, P. Kesten, J. W. Chapman, B. Cork, E. I. Shibata, K. Sugano, B. B. Brabson, D. E. Wood, R. L. McIlwain, S. Abachi, D. I. Meyer, and D.S. Koltick

Subjects
Quark, Physics, Particle physics, Annihilation, Meson, Electron–positron annihilation, High Energy Physics::Phenomenology, Nuclear Theory, Hadron, General Physics and Astronomy, Nuclear physics, Pair production, Pion, High Energy Physics::Experiment, Nuclear Experiment, Scalar meson
Abstract

The production of the tensor mesons f/sup 0/(1270) and K/sup *//sup 0/(1430) and the scalar meson S(975) have been observed in e/sup +/e/sup -/ annihilation at 29 GeV center-of-mass energy, by use of data obtained with the High-Resolution Spectrometer at the storage ring SLAC e/sup +/e/sup -/ PEP. The mean multiplicities for meson momenta greater than 1450 MeV/c are = 0.11 +- 0.04, = 0.10 +- 0.0 6, and = 0.05 +- 0.02 per hadronic event. The fragmentation functions of the tensor mesons are in good agreement with the predictions of the Webber cluster model. The data are consistent with a predominant strange-quark content of the S meson.

Published
1986
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36. Charged particle multiplicity distributions ine + e − annihilation at 29 GeV: a comparison with hadronic data

Author

K. K. Gan, J. M. Brom, M. T. Ken, D. Nitz, C. K. Jung, H. O. Ogren, M. Valdata-Nappi, D. Errede, L. E. Price, P. Baringer, C. R. Ng, D. Blockus, L. K. Rangan, B. Cork, P. Kooijman, J. W. Chapman, F. J. Loeffler, D.S. Koltick, B. G. Bylsma, R. P. Thun, K. Sugano, D. R. Rust, B. B. Brabson, R. Debonte, J. S. Loos, Carl W. Akerlof, E. I. Shibata, R. Tschirhart, M. Derrick, E. H. Low, D. I. Meyer, R. L. McIlwain, S. Abachi, D. H. Miller, B. Musgrave, and Jose Repond

Subjects
Physics, Particle physics, Annihilation, Physics and Astronomy (miscellaneous), Astrophysics::High Energy Astrophysical Phenomena, Electron–positron annihilation, Hadron, Multiplicity (mathematics), Poisson distribution, Charged particle, Nuclear physics, Binomial distribution, symbols.namesake, symbols, High Energy Physics::Experiment, Rapidity, Engineering (miscellaneous)
Abstract

The charged particle multiplicity distributions for two-jet events ine + e − annihilation at 29 GeV have been measured using the High Resolution Spectrometer at PEP. A Poisson distribution describes the data for both the complete event and for the single jets. In addition, no correlation is observed between the multiplicities in the two jets of an event. For fixed values of the prong number of the complete event, the multiplicity sharing between the two jets is in good agreement with a binomial distribution. The rapidity gap distribution is exponential with a slope equal to the mean rapidity density. These observations, which are consistent with a picture of independent emission of single particles, are contrasted to the results from soft hadronic collisions and conclusions are drawn about the nature of clusters.

Published
1987
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37. Production of η mesons in e+e− annihilations at √s=29 GeV

Author

M. T. Ken, B. B. Brabson, C. K. Jung, E. I. Shibata, R. P. Thun, D. I. Meyer, H.W. Paik, H. A. Neal, H. O. Ogren, R. Debonte, D. H. Miller, L. E. Price, J. S. Loos, R. L. McIlwain, S. Abachi, D. Blockus, P.M. Kooijman, C. R. Ng, D. Errede, B. Musgrave, Ben Bylsma, Carl W. Akerlof, J. M. Brom, R. Tschirhart, D.S. Koltick, B. Cork, K. Sugano, D. R. Rust, Jose Repond, M. Derrick, E. H. Low, J. W. Chapman, D. Nitz, and Philip Baringer

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Meson, Electron–positron annihilation, High Energy Physics::Phenomenology, Nuclear Theory, Hadron, Fragmentation (computing), Multiplicity (mathematics), Nuclear physics, Direct production, Fragmentation function, High Energy Physics::Experiment, Production (computer science), Nuclear Experiment
Abstract

Data from e + e − annihilations at 29 GeV have been used to measure the production cross section and fragmentation function of η mesons. The signal is observed in the η → γγ decay channel. The fragmentation for p η >1.5 GeV/ c agrees well with the prediction of the Lund model, whereas the prediction of the Webber model lies above the data. The mean multiplicity is measured to be 〈 n η 〉=0.58±0.10 η mesons per hadronic event, of which 0.51 represents the direct production of η and η ′ mesons in the fragmentation chain.

Published
1988
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38. Continuum Dimuon Production inp¯-W Collisions at 125 GeV/c

Author

E. G. Anassontzis, P. Kraushaar, D. E. Wagoner, C. T. Murphy, D. Nitz, H. Areti, A. Markou, Zhang Nai-Jian, D.J. Judd, F. Turkot, B. Cox, Liping Wang, J. Enagonio, M. Binkley, C. Hojvat, P.O. Mazur, X. Cui, D. G. Stairs, P. K. Malhotra, S. Conetti, G. Voulgaris, P. Lebrun, W. Schappert, Christine Kourkoumelis, Panos Kostarakis, R. P. Thun, And W. Yang, S. Katsanevas, Carl W. Akerlof, Timothy A. Ryan, L. K. Resvanis, He Mao, D. G. Ryan, R. Kephart, and R. L. Wagner

Subjects
Quantum chromodynamics, Nuclear physics, Nuclear reaction, Physics, Particle physics, Muon, Pair production, General Physics and Astronomy, Sigma, Inelastic scattering, Deep inelastic scattering, Nucleon
Abstract

The cross section for the reaction p-barN..--> mu../sup +/..mu../sup -/X with muon pairs in the mass range 40 was measured to be sigma = 0.104 +- 0.005 +- 0.008 nb/nucleon. The distributions dsigma/dx/sub F/ and M/sup 3/dsigma/dM were compared to the QCD-improved Drell-Yan model and to calculations including first-order QCD corrections using deep-inelastic structure functions. Excellent agreement with the data was obtained if the calculations were multiplied by factors of 2.45 and 1.41, respectively.

Published
1985
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39. Observation of structure in elastic pp scattering at 100 and 200 GeV/c

Author

D. D. Yovanovitch, D. P. Earlty, C.E.W. Ward, D. I. Meyer, R. Kotthaus, Carl W. Akerlof, I. Ambats, D. R. Rust, R. Lundy, S. M. Pruss, R. L. Loveless, and W.T. Meyer

Subjects
Physics, Diffraction, Scattering cross-section, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Scattering, Astrophysics::High Energy Astrophysical Phenomena, Scintillation counter, Momentum transfer, High Energy Physics::Experiment, Nuclear Experiment
Abstract

The elastic differential cross section for pp scattering has been measured up to a momentum transfer of abs. value t = 3 (GeV/c)$sup 2$ at 100 GeV/ c and 200 GeV/c incident momenta. The 200 GeV/c measurements show a diffractive- like dip at abs. value t = 1.5 GeV/c, while no such dip is seen in the 100 GeV/c data. (NL)

Published
1975
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40. Experimental limits on monojet production in e+e− annihilation at 29 GeV

Author

P. Kesten, D. Nitz, D. Errede, G. Baranko, D. H. Miller, M. Valdata-Nappi, G. Bonvicini, L. E. Price, J. Schlereth, M. Willutzky, L. K. Rangan, D. Blockus, J. S. Loos, R. Debonte, R. Fries, D. E. Wood, B. B. Brabson, L. G. Hyman, Robert Wilson, U. Mallik, S. W. Gray, K. K. Gan, S. Kooijman, J. W. Chapman, A. A. Seidl, F. J. Loeffler, C. R. Ng, J.M. Weiss, Carl W. Akerlof, J. Va'vra, N. Harnew, M. Derrick, P. Kooijman, B. Cork, Harold Ogren, P. Baringer, E. H. Low, D. Rubin, L. Keller, D.S. Koltick, T. Trinko, R. L. McIlwain, G. E. Forden, E. Fernandez, K. Sugano, B. G. Bylsma, D. R. Rust, I. Beltrami, E. I. Shibata, D. I. Meyer, H. A. Neal, R. P. Thun, C. K. Jung, P. P. Ong, and B. Musgrave

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Annihilation, Astrophysics::High Energy Astrophysical Phenomena, Theoretical models, Production (computer science), Jet (particle physics), Event (particle physics), Unobservable, Luminosity
Abstract

A search was made for e + e − →X 1 X 2 where X 1 consists of one or more light unobservable particles and X 2 decays promptly to a visible jet of particles. One event was found for an integrated luminosity of 176 pb −1 , a rate consistent with known backgrounds. This result places a significant constraint on a number of theoretical models.

Published
1985
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41. Experimental study of the reactionse+e−→e+e−ande+e−→γγ at 29 GeV

Author

B. Musgrave, B. Cork, K. Sugano, H. A. Neal, R. Debonte, N. Harnew, K. K. Gan, P. Kooijman, M. Willutzky, B. B. Brabson, F. J. Loeffler, P. Baringer, J. Schlereth, B. G. Bylsma, R. L. McIlwain, D. E. Wood, R. P. Thun, S. Abachi, E. I. Shibata, D.S. Koltick, A. A. Seidl, D. H. Miller, M. Valdata-Nappi, D. I. Meyer, Carl W. Akerlof, G. Bonvicini, L. E. Price, J. S. Loos, L. K. Rangan, S. W. Gray, M. Derrick, J. W. Chapman, E. H. Low, Harold Ogren, D. Blockus, C. K. Jung, I. Beltrami, U. Mallik, J.M. Weiss, D. R. Rust, T. Trinko, D. Errede, P. Kesten, C. R. Ng, and D. Nitz

Subjects
Physics, Elastic scattering, Particle physics, Annihilation, Scattering, Astrophysics::High Energy Astrophysical Phenomena, Electron–positron annihilation, Elementary particle, Nuclear physics, Pair production, High Energy Physics::Experiment, Nuclear Experiment, Bhabha scattering, Boson
Abstract

This paper reports measurements of the differential cross sections for the reactions e/sup +/e/sup -/..-->..e/sup +/e/sup -/ (Bhabha scattering) and e/sup +/e/sup -/..--> gamma gamma.. (..gamma..-pair production). The reactions are studied at a center-of-mass energy of 29 GeV and in the polar-angular region chemically bond costheta chemically bond 154 GeV and ..lambda../sub -/>220 GeV for Bhabha scattering, and ..lambda../sub +/>59 GeV and ..lambda../sub -/>59 GeV for ..gamma..-pair production.

Published
1986
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42. ΛProduction ine+e−Annihilations at 29 GeV: A Comparison with Lund-Model Predictions

Author

H. A. Neal, D. Blockus, R. Debonte, K. K. Gan, J. M. Brom, E. I. Shibata, M. Willutzky, J.M. Weiss, D. I. Meyer, D. R. Rust, M. Daigo, J. P. Guillaud, T. Trinko, R. L. McIlwain, S. Abachi, Carl W. Akerlof, B. Cork, F. J. Loeffler, H. O. Ogren, D. Errede, J. Schlereth, D. E. Wood, G. Bonvicini, L. E. Price, L. K. Rangan, K. Sugano, N. Harnew, D. H. Miller, D.S. Koltick, R. P. Thun, A. A. Seidl, B. Musgrave, M. Derrick, E. H. Low, S. W. Gray, C. K. Jung, B. B. Brabson, D. Nitz, P. Kesten, Ben Bylsma, J. W. Chapman, M. Valdata-Nappi, C. R. Ng, P. Baringer, J. S. Loos, P. Kooijman, and I. Beltrami

Subjects
Physics, Nuclear physics, Baryon, Diquark, Particle physics, Branching fraction, Electron–positron annihilation, Hadron, Hyperon, General Physics and Astronomy, Lambda, Lambda baryon
Abstract

This paper presents measurements of the inclusive production cross sections of ..lambda.. baryons in e/sup +/e/sup -/ annihilations at ..sqrt..s = 29 GeV. The data sample corresponds to an integrated luminosity of 256 pb/sup -1/ collected with the High-Resolution Spectrometer at the SLAC storage ring PEP. Comparisons are made to the predictions of the Lund model. The data are well described with use of a strange diquark suppression parameter, (us/ud)/(s/d), of 0.89 +- 0.10/sub -0.16//sup +0.56/, and the measured ..lambda../sub c/..--> lambda..+X branching ratio of (23 +- 10%).

Published
1986
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43. High-mass dimuon production inp¯Nandπ−N interactions at 125 GeV/c

Author

D. E. Wagoner, G. Voulgaris, C. T. Murphy, S. Conetti, X. Cui, Zhang Nai-Jian, B. Cox, Timothy A. Ryan, R. Kephart, Kiritsis E, D.J. Judd, Wannian Yang, R. P. Thun, L. K. Resvanis, Liping Wang, D. Nitz, P. K. Malhotra, Carl W. Akerlof, Christine Kourkoumelis, H. Areti, A. Markou, He Mao, F. Turkot, P. Lebrun, D. G. Ryan, W. Schappert, S. Katsanevas, J. Enagonio, R. L. Wagner, Dg Stairs, C. Hojvat, M. Binkley, P.O. Mazur, E. G. Anassontzis, and P. Kraushaar

Subjects
Quantum chromodynamics, Nuclear reaction, Physics, Particle physics, Muon, Nuclear Theory, High Energy Physics::Phenomenology, Elementary particle, Nuclear physics, Pair production, High Energy Physics::Experiment, Production (computer science), Invariant mass, Nuclear Experiment, Nucleon
Abstract

We have studied muon pairs with an invariant mass between 4 and 9 GeV/${c}^{2}$ produced in p\ifmmode\bar\else\textasciimacron\fi{}N and ${\ensuremath{\pi}}^{\mathrm{\ensuremath{-}}}$N interactions at an incident momentum of 125 GeV/c. The experiment was performed at Fermilab using a tungsten target and a special beam enriched to contain 18% antiprotons. We compare differential distributions as functions of the dimuon invariant mass, Feynman x, transverse momentum, and decay angles of the dimuon to the predictions of the Drell-Yan model including QCD corrections. Quark structure functions for the p\ifmmode\bar\else\textasciimacron\fi{} and ${\ensuremath{\pi}}^{\mathrm{\ensuremath{-}}}$ are extracted. Comparisons of the antiproton data to the Drell-Yan model are significant because the cross sections depend principally on the valence-quark structure functions which are accurately determined by deep-inelastic scattering measurements. The measured absolute cross section (integrated over positive Feynman x and all transverse momenta) is 0.106\ifmmode\pm\else\textpm\fi{}0.005\ifmmode\pm\else\textpm\fi{}0.008 nb/nucleon for the p\ifmmode\bar\else\textasciimacron\fi{}N interaction and 0.107\ifmmode\pm\else\textpm\fi{}0.003\ifmmode\pm\else\textpm\fi{}0.009 nb/nucleon for the ${\ensuremath{\pi}}^{\mathrm{\ensuremath{-}}}$N interaction, where the quoted errors are statistical and systematic, respectively. Normalization (K) factors that are required to bring the naive Drell-Yan and first-order QCD predictions into agreement with the measurements are extracted, and the uncertainties involved in such comparisons are examined.

Published
1988
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44. Production cross section and electroweak asymmetry of D* and D mesons produced in e+e− annihilations at 29 GeV

Author

B. B. Brabson, H. O. Ogren, L. E. Price, D. Nitz, B. G. Bylsma, D. H. Miller, J. W. Chapman, E. I. Shibata, C. K. Jung, Carl W. Akerlof, R. L. McIlwain, P. Kooijman, D. Errede, M. Derrick, Jose Repond, E. H. Low, D. Blockus, R. Tschirhart, R. de Bonte, P. Baringer, J. M. Brom, A. Snyder, D. I. Meyer, M. T. Ken, B. Cork, D.S. Koltick, H. A. Neal, K. Sugano, D. R. Rust, S. Abachi, R. P. Thun, C. R. Ng, and B. Musgrave

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Pion, Pair production, Meson, Branching fraction, Electron–positron annihilation, Electroweak interaction, Hadron, Pseudovector
Abstract

The production of D * and D mesons has been studied in e + e − annihilations at √s = 29GeV. The data, corresponding to an integrated luminosity of 300 pb −1 , were obtained using the HRS detector at PEP. The cross section is measured to be R (D 0 + D + ) = 2.40±0.35 and we determine the electroweak asymmetry to be −9.9 ± 2.7%, which corresponds to an axial vector coupling constant product g e g c = 0.26 ± 0.07.

Published
1988
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45. Measurement of theτ-Lepton Lifetime

Author

K. K. Gan, R. L. McIlwain, S. Abachi, R. P. Thun, D. R. Rust, H. O. Ogren, F. J. Loeffler, L. E. Price, L. K. Rangan, D. Blockus, M. T. Ken, D. Errede, H. W. Paik, D. H. Miller, E. I. Shibata, H. A. Neal, R. Debonte, P.M. Kooijman, C. R. Ng, C. K. Jung, M. Derrick, B. Musgrave, B. Cork, J. M. Brom, D.S. Koltick, Jose Repond, E. H. Low, K. Sugano, J. W. Chapman, B. B. Brabson, Philip Baringer, Ben Bylsma, D. Nitz, Carl W. Akerlof, R. Tschirhart, J. S. Loos, and D. I. Meyer

Subjects
Physics, Particle physics, Spectrometer, Electron–positron annihilation, General Physics and Astronomy, Elementary particle, Fermion, Particle detector, Charged particle, Nuclear physics, Measuring instrument, Physics::Accelerator Physics, High Energy Physics::Experiment, Lepton
Abstract

We report a new and precise measurement of the lifetime of the tau lepton. The data were taken with the High Resolution Spectrometer at the SLAC e/sup +/e/sup -/ colliding-beam facility PEP operating at 29 GeV center-of-mass energy. The flight distances of 1311 tau decays to three charged particles were measured with a four-layer tubular-cell vertex chamber in conjunction with the main drift chamber. The resulting lifetime of the tau lepton is tau/sub tau/(2.99 +- 0.15 +- 0.10) x 10/sup -13/ sec.

Published
1987
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46. Inclusive η production in τ decays

Author

D. Errede, H. O. Ogren, R. P. Thun, Jose Repond, C. K. Jung, L. E. Price, B. G. Bylsma, L. K. Rangan, B. B. Brabson, C. R. Ng, J. S. Loos, P. Kooijman, R. de Bonte, E. I. Shibata, M. Derrick, J. M. Brom, E. H. Low, H. A. Neal, H.W. Paik, D.S. Koltick, M. T. Ken, P. Baringer, D. Blockus, J. W. Chapman, D. Nitz, D. I. Meyer, Carl W. Akerlof, R. Tschirhart, D. H. Miller, B. Musgrave, R. L. McIlwain, S. Abachi, D. R. Rust, B. Cork, and K. Sugano

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Meson, Electron–positron annihilation, Hadron, Elementary particle, lcsh:QC1-999, Charged particle, Nuclear physics, Particle decay, Mass spectrum, lcsh:Physics, Lepton
Abstract

We have searched for inclusive η production in τ decays using a data sample of 2553 events of e + e - →τ + τ - in the one-three topology. The data were obtained using the High Resolution Spectrometer at √ s =29 GeV. A 90% confidence level upper limit on the process τ ± →π ± ηX of 2.1% is found. Using τ decays to five charged particles limits of 0.5% on τ ± →π ± ηηX and 0.3% on τ ± →π ± π + π - ηX are also obtained.

Published
1987
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47. Differential cross section of the reaction π+ +p→K+ +Y* (1385) at 4.0 and 5.05 GeV/c

Author

R. A. Lundy, J. Lales, D. D. Yovanovich, S. P. Ying, D. R. Rust, Carl W. Akerlof, S. M. Pruss, D. I. Meyer, and C. E. W. Ward

Subjects
Nuclear physics, Scattering cross-section, Physics, Nuclear and High Energy Physics, Particle physics, Particle model, Symmetry breaking, Group theory
Abstract

Approximately 1900 events were obtained in the differential cross section measurements of the reaction π + +p→K + +Y * (1385). Forward peaks were found with slopes of 2.3 ± 0.3 and 2.6 ± 0.4 (GeV/ c ) −2 for 4 and 5.05 GeV/ c respectively. This data together with that in other decuplet production reactions gives evidence of a large SU(3) violation as would be expected from the mass splitting of the strange and non-strange exchanged particles.

Published
1969
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48. Structure in 5-GeV/cπ+pElastic Scattering at Large Angles

Author

R. A. Lundy, C. E. W. Ward, D. I. Meyer, P. Schmueser, P. N. Kirk, D. D. Yovanovitch, D. R. Rust, K. S. Han, Carl W. Akerlof, and S. M. Pruss

Subjects
Physics, Elastic scattering, Particle physics, Structure (category theory), General Physics and Astronomy, Atomic physics
Abstract

Data from a high-resolution experiment on the reaction ${\ensuremath{\pi}}^{+}p\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}+p$ at 5 GeV/c show a very deep, sharp dip in $\frac{d\ensuremath{\sigma}}{\mathrm{dt}}$ at $t=\ensuremath{-}2.8$ ${(\mathrm{G}\mathrm{e}\mathrm{V}/\mathit{c})}^{2}$ and a gentle exponential decrease in $\frac{d\ensuremath{\sigma}}{\mathrm{du}}$ between $u=\ensuremath{-}1.5 \mathrm{and} \ensuremath{-}3.5$ ${(\mathrm{G}\mathrm{e}\mathrm{V}/\mathit{c})}^{2}$.

Published
1970
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49. Elastic Scattering of Hadrons at 50 to 200 GeV

Author

D. D. Yovanovitch, D. I. Meyer, C.E.W. Ward, S. M. Pruss, I. Ambats, D. R. Rust, Carl W. Akerlof, R. Lundy, D. P. Eartly, R. Kotthaus, R. L. Loveless, and W.T. Meyer

Subjects
Elastic scattering, Physics, Particle physics, Antiparticle, Pion, Meson, Hadron, Momentum transfer, General Physics and Astronomy, Elementary particle, Boson
Abstract

The differential cross section for ${\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}}$, ${K}^{\ifmmode\pm\else\textpm\fi{}}$, and ${p}^{\ifmmode\pm\else\textpm\fi{}}$ on hydrogen have been measured in the range $0.07l\ensuremath{-}tl1.6$ ${(\mathrm{G}\mathrm{e}\mathrm{V}/\mathit{c})}^{2}$. The dependence on momentum, momentum, transfer, and particle type are discussed.

Published
1975
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50. Tau-neutrino mass limit

Author

C. K. Jung, Harold Ogren, D. Nitz, B. G. Bylsma, K. K. Gan, D. R. Rust, P. Baringer, R. P. Thun, D. I. Meyer, C. R. Ng, J. Repond, B. Cork, D. H. Miller, R. L. McIlwain, S. Abachi, E. I. Shibata, J. M. Brom, R. de Bonte, J. S. Loos, M. Derrick, E. H. Low, K. Sugano, M. T. Ken, D. Errede, J. W. Chapman, Carl W. Akerlof, H.W. Paik, B. B. Brabson, R. Tschirhart, P. Kooijman, F. J. Loeffler, D.S. Koltick, L. E. Price, D. Blockus, B. Musgrave, and L. K. Rangan

Subjects
Physics, Semileptonic decay, Nuclear physics, Particle decay, Particle physics, Meson, Tau neutrino, Hadron, Mass spectrum, High Energy Physics::Experiment, Neutrino, Lepton
Abstract

Using a data sample corresponding to an integrated luminosity of 300 pb/sup -1/ collected by the High Resolution Spectrometer, a 95%-confidence-level upper limit of 76 MeV/c/sup 2/ is found for the mass of the tau neutrino. The experiment is based on a study of the hadronic mass spectrum in the decays tau..-->..5..pi../sup +- /..nu../sub tau/ and tau..-->..5..pi../sup +- /..pi../sup 0/..nu../sub tau/.

Published
1987
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