Identified charged particle spectra and yields in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mtext>Au</mml:mtext><mml:mo>+</mml:mo><mml:mtext>Au</mml:mtext></mml:mrow></mml:math>collisions at<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msqrt><mml:mrow><mml:msub><mml:mi mathvariant="bold-italic">s</mml:mi><mml:mrow><mml:mi mathvariant="bold-italic">N</mml:mi><mml:mi mathvariant="bold-italic">N</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:msqrt><mml:mo>=</mml:mo><mml:mn>200</mml:mn><mml:mspace width="0.3em"/><mml:mtext>GeV</mml:mtext></mml:mrow></mml:math>
Stephen AdlerBrookhaven National Laboratory, Upton, New York 11973-5000, USAS. AfanasievJoint Institute for Nuclear Research, 141980 Dubna, Moscow Region, RussiaC. AidalaBrookhaven National Laboratory, Upton, New York 11973-5000, USAN. N. AjitanandChemistry Department, Stony Brook University, SUNY, Stony Brook, New York 11794-3400, USAY. AkibaKEK, High Energy Accelerator Research Organization, Tsukuba-shi, Ibaraki-ken 305-0801, JapanJ. AlexanderChemistry Department, Stony Brook University, SUNY, Stony Brook, New York 11794-3400, USAR. AmirikasFlorida State University, Tallahassee, Florida 32306, USAL. AphecetcheSUBATECH (Ecole des Mines de Nantes, CNRS-IN2P3, Université de Nantes), BP 20722, 44307 Nantes, FranceS. H. AronsonBrookhaven National Laboratory, Upton, New York 11973-5000, USAR. AverbeckDepartment of Physics and Astronomy, Stony Brook University, SUNY, Stony Brook, New York 11794, USAT. C. AwesOak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USAR. AzmounDepartment of Physics and Astronomy, Stony Brook University, SUNY, Stony Brook, New York 11794, USAV. BabintsevInstitute for High Energy Physics (IHEP), Protvino, RussiaA. BaldisseriDapnia, CEA Saclay, F-91191 Gif-sur-Yvette, FranceK. N. BarishUniversity of California—Riverside, Riverside, California 92521, USAP. D. BarnesLos Alamos National Laboratory, Los Alamos, New Mexico 87545, USAB. BassalleckUniversity of New Mexico, Albuquerque, New Mexico 87131, USAS. BatheInstitut fuer Kernphysik, University of Muenster, D-48149 Muenster, GermanyS. BatsouliColumbia University, New York, New York 10027, USA and Nevis Laboratories, Irvington, New York 10533, USAV. BaublisPNPI, Petersburg Nuclear Physics Institute, Gatchina, RussiaA. BazilevskyRIKEN BNL Research CenterS. BelikovIowa State University, Ames, Iowa 50011, USAY. BerdnikovS. BhagavatulaIowa State University, Ames, Iowa 50011, USAJ. G. BoissevainLos Alamos National Laboratory, Los Alamos, New Mexico 87545, USAH. BorelDapnia, CEA Saclay, F-91191 Gif-sur-Yvette, FranceS. BorensteinLaboratoire Leprince-Ringuet, Ecole Polytechnique, CNRS-IN2P3, Route de Saclay, F-91128 Palaiseau, FranceM. L. BrooksLos Alamos National Laboratory, Los Alamos, New Mexico 87545, USAD. S. BrownNew Mexico State University, Las Cruces, New Mexico 88003, USAN. BrunerUniversity of New Mexico, Albuquerque, New Mexico 87131, USAD. BucherInstitut fuer Kernphysik, University of Muenster, D-48149 Muenster, GermanyH. BueschingInstitut fuer Kernphysik, University of Muenster, D-48149 Muenster, GermanyV. BumazhnovInstitute for High Energy Physics (IHEP), Protvino, RussiaG. BunceRIKEN BNL Research Center, Brookhaven National Laboratory, Upton, New York 11973-5000, USAJ. M. Burward-HoyLawrence Livermore National Laboratory, Livermore, California 94550, USAS. ButsykDepartment of Physics and Astronomy, Stony Brook University, SUNY, Stony Brook, New York 11794, USAX. CamardSUBATECH (Ecole des Mines de Nantes, CNRS-IN2P3, Université de Nantes), BP 20722, 44307 Nantes, FranceJ.-S. ChaiKAERI, Cyclotron Application Laboratory, Seoul, South KoreaP. ChandBhabha Atomic Research Centre, Bombay 400 085, IndiaW. C. ChangInstitute of Physics, Academia Sinica, Taipei 11529, TaiwanS. ChernichenkoInstitute for High Energy Physics (IHEP), Protvino, RussiaC. Y.Columbia University, New York, New York 10027, USA and Nevis Laboratories, Irvington, New York 10533, USAJ. ChibaKEK, High Energy Accelerator Research Organization, Tsukuba-shi, Ibaraki-ken 305-0801, JapanM. ChiuColumbia University, New York, New York 10027, USA and Nevis Laboratories, Irvington, New York 10533, USAI. J. ChoiYonsei University, IPAP, Seoul 120-749, KoreaJ. B. ChoiKangnung National University, Kangnung 210-702, South KoreaR. K. ChoudhuryBhabha Atomic Research Centre, Bombay 400 085, IndiaT. ChujoBrookhaven National Laboratory, Upton, New York 11973-5000, USAV. CiancioloOak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USAY. CobigoDapnia, CEA Saclay, F-91191 Gif-sur-Yvette, FranceB. ColeColumbia University, New York, New York 10027, USA and Nevis Laboratories, Irvington, New York 10533, USAP. ConstantinIowa State University, Ames, Iowa 50011, USAD. d’EnterriaSUBATECH (Ecole des Mines de Nantes, CNRS-IN2P3, Université de Nantes), BP 20722, 44307 Nantes, FranceG. DavidBrookhaven National Laboratory, Upton, New York 11973-5000, USAH. DelagrangeSUBATECH (Ecole des Mines de Nantes, CNRS-IN2P3, Université de Nantes), BP 20722, 44307 Nantes, FranceA. DenisovInstitute for High Energy Physics (IHEP), Protvino, RussiaA. DeshpandeRIKEN BNL Research Center, Brookhaven National Laboratory, Upton, New York 11973-5000, USAE. J. DesmondBrookhaven National Laboratory, Upton, New York 11973-5000, USAO. DietzschUniversidade de São Paulo, Instituto de Física, Caixa Postal 66318, São Paulo CEP05315-970, BrazilO. DrapierLaboratoire Leprince-Ringuet, Ecole Polytechnique, CNRS-IN2P3, Route de Saclay, F-91128 Palaiseau, FranceA. DreesDepartment of Physics and Astronomy, Stony Brook University, SUNY, Stony Brook, New York 11794, USAR. du RietzDepartment of Physics, Lund University, Box 118, SE-221 00 Lund, SwedenA. DurumInstitute for High Energy Physics (IHEP), Protvino, RussiaDipanwita DuttaBhabha Atomic Research Centre, Bombay 400 085, IndiaY. V. EfremenkoOak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USAK. El ChenawiVanderbilt University, Nashville, Tennessee 37235, USAA. EnokizonoHiroshima University, Kagamiyama, Higashi-Hiroshima 739-8526, JapanH. En‘yoRIKEN (The Institute of Physical and Chemical Research), Wako, Saitama 351-0198, JapanS. EsumiInstitute of Physics, University of Tsukuba, Tsukuba, Ibaraki 305, JapanL. EwellBrookhaven National Laboratory, Upton, New York 11973-5000, USAD. E. FieldsUniversity of New Mexico, Albuquerque, New Mexico 87131, USAF. FleuretLaboratoire Leprince-Ringuet, Ecole Polytechnique, CNRS-IN2P3, Route de Saclay, F-91128 Palaiseau, FranceS. FokinRussian Research Center "Kurchatov Institute," Moscow, RussiaB. D. FoxRIKEN BNL Research Center, Brookhaven National Laboratory, Upton, New York 11973-5000, USAZ. FraenkelWeizmann Institute, Rehovot 76100, IsraelJ. E. FrantzColumbia University, New York, New York 10027, USA and Nevis Laboratories, Irvington, New York 10533, USAA. FranzBrookhaven National Laboratory, Upton, New York 11973-5000, USAA. D. FrawleyFlorida State University, Tallahassee, Florida 32306, USAS.-Y. FungUniversity of California—Riverside, Riverside, California 92521, USAS. GarpmanDepartment of Physics, Lund University, Box 118, SE-221 00 Lund, SwedenTarun Kanti GhoshVanderbilt University, Nashville, Tennessee 37235, USAA. GlennUniversity of Tennessee, Knoxville, Tennessee 37996, USAG. GogiberidzeUniversity of Tennessee, Knoxville, Tennessee 37996, USAM. GoninLaboratoire Leprince-Ringuet, Ecole Polytechnique, CNRS-IN2P3, Route de Saclay, F-91128 Palaiseau, FranceJ. GössetDapnia, CEA Saclay, F-91191 Gif-sur-Yvette, FranceY. GotoRIKEN BNL Research Center, Brookhaven National Laboratory, Upton, New York 11973-5000, USAR. Granier de CassagnacLaboratoire Leprince-Ringuet, Ecole Polytechnique, CNRS-IN2P3, Route de Saclay, F-91128 Palaiseau, FranceN. GrauIowa State University, Ames, Iowa 50011, USAS. V. GreeneVanderbilt University, Nashville, Tennessee 37235, USAM. Große PerdekampRIKEN BNL Research Center, Brookhaven National Laboratory, Upton, New York 11973-5000, USAW. GurynBrookhaven National Laboratory, Upton, New York 11973-5000, USAH.-Å. GustafssonDepartment of Physics, Lund University, Box 118, SE-221 00 Lund, SwedenT. HachiyaHiroshima University, Kagamiyama, Higashi-Hiroshima 739-8526, JapanJ. S. HaggertyBrookhaven National Laboratory, Upton, New York 11973-5000, USAH. HamagakiCenter for Nuclear Study, Graduate School of Science, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, JapanA. G. HansenLos Alamos National Laboratory, Los Alamos, New Mexico 87545, USAE. P. HartouniLawrence Livermore National Laboratory, Livermore, California 94550, USAM. HarveyBrookhaven National Laboratory, Upton, New York 11973-5000, USAR. HayanoCenter for Nuclear Study, Graduate School of Science, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, JapanX. HeGeorgia State University, Atlanta, Georgia 30303, USA
2004lv
ABI
Аннотация
The centrality dependence of transverse momentum distributions and yields for pi^+/-, K^+/-, p and p^bar in Au+Au collisions at sqrt(s_NN) = 200 GeV at mid-rapidity are measured by the PHENIX experiment at RHIC. We observe a clear particle mass dependence of the shapes of transverse momentum spectra in central collisions below ~ 2 GeV/c in p_T. Both mean transverse momenta and particle yields per participant pair increase from peripheral to mid-central and saturate at the most central collisions for all particle species. We also measure particle ratios of pi^-/pi^+, K^-/K^+, p^bar/p, K/pi, p/pi and p^bar/pi as a function of p_T and collision centrality. The ratios of equal mass particle yields are independent of p_T and centrality within the experimental uncertainties. In central collisions at intermediate transverse momenta ~ 1.5-4.5 GeV/c, proton and anti-proton yields constitute a significant fraction of the charged hadron production and show a scaling behavior different from that of pions.
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