| Title | Dilepton mass spectra in p plus p collisions at root s=200 GeV |
| Authors | Adare, A. Afanasiev, S. Aidala, C. Ajitanand, N. N. Akiba, Y. Al-Bataineh, H. Alexander, J. Aoki, K. Aphecetche, L. Armendariz, R. Aronson, S. H. Asai, J. Atomssa, E. T. Averbeck, R. Awes, T. C. Azmoun, B. Babintsev, V. Baksay, G. Baksay, L. Baldisseri, A. Barish, K. N. Barnes, R. Bassalleck, B. Bathe, S. Batsouli, S. Baublis, V. Bazilevsky, A. Belikov, S. Bennett, R. Berdnikov, Y. Bickley, A. A. Boissevain, J. G. Borel, H. Boyle, K. Brooks, M. L. Buesching, H. Bumazhnov, V. Bunce, G. Butsyk, S. Campbell, S |
| Affiliation | Abilene Christian Univ, Abilene, TX 79699 USA. Banaras Hindu Univ, Dept Phys, Varanasi 221005, Uttar Pradesh, India. Brookhaven Natl Lab, Upton, NY 11973 USA. Univ Calif Riverside, Riverside, CA 92521 USA. Charles Univ Prague, CR-11636 Prague, Czech Republic. CIAE, Beijing, Peoples R China. Univ Tokyo, Grad Sch Sci, Ctr Nucl Study, Tokyo 1130033, Japan. Univ Colorado, Boulder, CO 80309 USA. Nevis Labs, Irvington, NY 10533 USA. Columbia Univ, New York, NY 10027 USA. Czech Tech Univ, Prague 16636, Czech Republic. CEA Saclay, F-91191 Gif Sur Yvette, France. Debrecen Univ Med, H-4010 Debrecen, Hungary. Eotvos Lorand Univ, ELTE, H-1117 Budapest, Hungary. Florida Inst Technol, Melbourne, FL 32901 USA. Florida State Univ, Tallahassee, FL 32306 USA. Georgia State Univ, Atlanta, GA 30303 USA. Hiroshima Univ, Higashihiroshima 7398526, Japan. Inst High Energy Phys, State Res Ctr Russian Fed, IHEP Protvino, Protvino 142281, Russia. Univ Illinois, Urbana, IL 61801 USA. Acad Sci Czech Republic, Inst Phys, Prague 18221 8, Czech Republic. Iowa State Univ, Ames, IA 50011 USA. Joint Inst Nucl Res, Dubna 141980, Moscow Region, Russia. High Energy Accelerator Res Org, KEK, Tsukuba, Ibaraki 3050801, Japan. Hungarian Acad Sci, MTA KFKI RMKI, Res Inst Particle & Nucl Phys, KFKI, H-1525 Budapest, Hungary. Korea Univ, Seoul 136701, South Korea. IV Kurchatov Atom Energy Inst, Russian Res Ctr, Moscow 123182, Russia. Kyoto Univ, Kyoto 6068502, Japan. Ecole Polytech, CNRS, IN2P3, Lab Leprince Ringuet, F-91128 Palaiseau, France. Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. Los Alamos Natl Lab, Los Alamos, NM 87545 USA. Univ Clermont Ferrand, LPC, CNRS, IN2P3, F-63177 Clermont Ferrand, France. Lund Univ, Dept Phys, SE-22100 Lund, Sweden. Univ Munster, Inst Kernphys, D-48149 Munster, Germany. Myongii Univ, Yongin 449728, Kyonggido, South Korea. Nagasaki Inst Appl Sci, Nagasaki 8510193, Japan. Univ New Mexico, Albuquerque, NM 87131 USA. New Mexico State Univ, Las Cruces, NM 88003 USA. Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. Univ Paris 11, CNRS, IN2P3, IPN, F-91406 Orsay, France. Peking Univ, Beijing 100871, Peoples R China. Petersburg Nucl Phys Inst, PNPI, Gatchina 188300, Leningrad Reg, Russia. RIKEN, Wako, Saitama 3510198, Japan. Brookhaven Natl Lab, RIKEN BNL Res Ctr, Upton, NY 11973 USA. Rikkyo Univ, Dept Phys, Tokyo 1718501, Japan. St Petersburg State Polytech Univ, St Petersburg, Russia. Univ Sao Paulo, Inst Fis, BR-05315970 Sao Paulo, Brazil. Seoul Natl Univ, Syst Elect Lab, Seoul, South Korea. SUNY Stony Brook, Dept Chem, Stony Brook, NY 11794 USA. SUNY Stony Brook, Dept Phys & Astron, Stony Brook, NY 11794 USA. Univ Nantes, CNRS, IN2P3, Ecole Mines,SUBATECH, F-44307 Nantes, France. Univ Tennessee, Knoxville, TN 37996 USA. Tokyo Inst Technol, Dept Phys, Meguro Ku, Tokyo 1528551, Japan. Univ Tsukuba, Inst Phys, Tsukuba, Ibaraki 305, Japan. Vanderbilt Univ, Nashville, TN 37235 USA. Waseda Univ, Adv Res Inst Sci & Engn, Tokyo 1620044, Japan. Weizmann Inst Sci, IL-76100 Rehovot, Israel. Yonsei Univ, Seoul 120749, South Korea. |
| Keywords | PAIR PRODUCTION PHENIX MESONS DECAYS |
| Issue Date | 2009 |
| Publisher | physics letters b |
| Citation | PHYSICS LETTERS B.2009,670,(4-5),313-320. |
| Abstract | PHENIX has measured the electron-positron pair mass spectrum from 0 to 8 GeV/c(2) in p + p collisions at root s = 200 GeV. The contributions from light meson decays to e(+)e(-) pairs have been determined based on measurements of hadron production cross sections by PHENIX. Within the systematic uncertainty of similar to 20% they account for all e(+)e(-) pairs in the mass region below similar to 1 GeV/c(2). The e(+)e(-) pair yield remaining after subtracting these contributions is dominated by semileptonic decays of charmed hadrons correlated through flavor conservation. Using the spectral shape predicted by PYTHIA, we estimate the charm production cross section to be 544 +/- 39(stat) +/- 142(syst) +/- 200(model) pb. which is consistent with QCD calculations and measurements of single leptons by PHENIX. (C) 2008 Elsevier BV. All rights reserved. |
| URI | http://hdl.handle.net/20.500.11897/246606 |
| ISSN | 0370-2693 |
| DOI | 10.1016/j.physletb.2008.10.064 |
| Indexed | SCI(E) |
| Appears in Collections: | 待认领 |
