Nuclear Modification of Electron Spectra and Implications for Heavy Quark Energy Loss in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>Au</mml:mi><mml:mo>+</mml:mo><mml:mi>Au</mml:mi></mml:math>Collisions at<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msqrt><mml:msub><mml:mi>s</mml:mi><mml:mrow><mml:mi>N</mml:mi><mml:mi>N</mml:mi></mml:mrow></mml:msub></mml:msqrt><mml:mo>=</mml:mo><mml:mn>200</mml:mn><mml:mtext> </mml:mtext><mml:mtext> </mml:mtext><mml:mi>GeV</mml:mi></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, Ibaraki 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. BabintsevIHEP Protvino, State Research Center of Russian Federation, Institute for High Energy Physics, Protvino 142281, 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 für 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, Leningrad Region 188300, RussiaA. BazilevskyIHEP Protvino, State Research Center of Russian Federation, Institute for High Energy Physics, Protvino 142281, RussiaS. BelikovIHEP Protvino, State Research Center of Russian Federation, Institute for High Energy Physics, Protvino 142281, RussiaY. BerdnikovSaint Petersburg State Polytechnic University, St. Petersburg, RussiaS. 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 für Kernphysik, University of Muenster, D-48149 Muenster, GermanyH. BueschingInstitut für Kernphysik, University of Muenster, D-48149 Muenster, GermanyV. BumazhnovIHEP Protvino, State Research Center of Russian Federation, Institute for High Energy Physics, Protvino 142281, RussiaG. BunceBrookhaven National Laboratory, Upton, New York 11973-5000, USAJ. M. Burward-HoyDepartment of Physics and Astronomy, Stony Brook University, SUNY, Stony Brook, New York 11794, 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. ChernichenkoIHEP Protvino, State Research Center of Russian Federation, Institute for High Energy Physics, Protvino 142281, 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, Ibaraki 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. DenisovIHEP Protvino, State Research Center of Russian Federation, Institute for High Energy Physics, Protvino 142281, RussiaA. DeshpandeRIKEN BNL Research Center, Brookhaven National Laboratory, Upton, New York 11973-5000, USAE. J. DesmondBrookhaven National Laboratory, Upton, New York 11973-5000, USAA. DevismesDepartment of Physics and Astronomy, Stony Brook University, SUNY, Stony Brook, New York 11794, USAO. DietzschInstituto de Física, Universidade de São Paulo, 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. DurumIHEP Protvino, State Research Center of Russian Federation, Institute for High Energy Physics, Protvino 142281, RussiaDipanwita DuttaBhabha Atomic Research Centre, Bombay 400 085, IndiaY. V. EfremenkoOak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USAJ. EgdemirDepartment of Physics and Astronomy, Stony Brook University, SUNY, Stony Brook, New York 11794, USAK. El ChenawiVanderbilt University, Nashville, Tennessee 37235, USAA. EnokizonoHiroshima University, Kagamiyama, Higashi-Hiroshima 739-8526, JapanH. En’yoRIKEN BNL Research Center, Brookhaven National Laboratory, Upton, New York 11973-5000, USAS. EsumiInstitute of Physics, University of Tsukuba, Tsukuba, Ibaraki 305, JapanL. EwellBrookhaven National Laboratory, Upton, New York 11973-5000, USAD. E. FieldsRIKEN BNL Research Center, Brookhaven National Laboratory, Upton, New York 11973-5000, USAF. FleuretLaboratoire Leprince-RinguetS. 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, USA
2006lv
ABI
Аннотация
The PHENIX experiment has measured midrapidity ($|\ensuremath{\eta}|<0.35$) transverse momentum spectra ($0.4<{p}_{T}<5.0\text{ }\text{ }\mathrm{GeV}/c$) of electrons as a function of centrality in $\mathrm{Au}+\mathrm{Au}$ collisions at $\sqrt{{s}_{NN}}=200\text{ }\text{ }\mathrm{GeV}$. Contributions from photon conversions and from light hadron decays, mainly Dalitz decays of ${\ensuremath{\pi}}^{0}$ and $\ensuremath{\eta}$ mesons, were removed. The resulting nonphotonic electron spectra are primarily due to the semileptonic decays of hadrons carrying heavy quarks. Nuclear modification factors were determined by comparison to nonphotonic electrons in $p+p$ collisions. A significant suppression of electrons at high ${p}_{T}$ is observed in central $\mathrm{Au}+\mathrm{Au}$ collisions, indicating substantial energy loss of heavy quarks.
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