Nuclear modification factors of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>ϕ</mml:mi></mml:mrow></mml:math>mesons in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>d</mml:mi><mml:mo>+</mml:mo><mml:mi mathvariant="bold">Au</mml:mi></mml:mrow></mml:math>,<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi mathvariant="bold">Cu</mml:mi><mml:mo fontweight="bold" fontstyle="normal">+</mml:mo><mml:mi mathvariant="bold">Cu</mml:mi></mml:mrow></mml:math>, and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi mathvariant="bold">Au</mml:mi><mml:mo fontweight="bold" fontstyle="normal">+</mml:mo><mml:mi mathvariant="bold">Au</mml:mi></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>s</mml:mi><mml:mrow><mml:mi mathvariant="italic">NN</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:msqrt><mml:mo>=</mml:mo><mml:mn>200</mml:mn><mml:mi> </mml:mi><mml:mi mathvariant="bold">GeV</mml:mi></mml:mrow></mml:math>
A. AdareUniversity of Colorado, Boulder, Colorado 80309, USAS. AfanasievJoint Institute for Nuclear Research, RU-141980 Dubna, Moscow Region, RussiaC. AidalaColumbia University, New York, New York 10027, USA and Nevis Laboratories, Irvington, New York 10533, USAN. N. AjitanandDepartment of Chemistry, Stony Brook University, Stony Brook, SUNY, New York 11794-3400, USAY. AkibaRIKEN BNL Research Center, Brookhaven National Laboratory, Upton, New York 11973-5000, USAH. Al-BatainehNew Mexico State University, Las Cruces, New Mexico 88003, USAJ. AlexanderDepartment of Chemistry, Stony Brook University, Stony Brook, SUNY, New York 11794-3400, USAA. Al-JamelNew Mexico State University, Las Cruces, New Mexico 88003, USAAaron AngeramiColumbia University, New York, New York 10027, USA and Nevis Laboratories, Irvington, New York 10533, USAK. AokiKyoto University, Kyoto 606-8502, JapanN ApadulaDepartment of Physics and Astronomy, Stony Brook University, SUNY, Stony Brook, New York 11794, USAL. AphecetcheSUBATECH (Ecole des Mines de Nantes, CNRS-IN2P3, Université de Nantes) Boîte Postale, F-20722-44307 Nantes, FranceY. AramakiCenter for Nuclear Study, Graduate School of Science, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, JapanR. ArméndarizNew Mexico State University, Las Cruces, New Mexico 88003, USAS. H. AronsonPhysics Department, Brookhaven National Laboratory, Upton, New York 11973-5000, USAJ. AsaiRIKEN BNL Research Center, Brookhaven National Laboratory, Upton, New York 11973-5000, USAE. T. AtomssaLaboratoire Leprince-Ringuet, Ecole Polytechnique, CNRS-IN2P3, Route de Saclay, F-91128 Palaiseau, FranceR. AverbeckDepartment of Physics and Astronomy, Stony Brook University, SUNY, Stony Brook, New York 11794, USAT. C. AwesOak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USAB. AzmounPhysics Department, Brookhaven National Laboratory, Upton, New York 11973-5000, USAV. BabintsevIHEP Protvino, State Research Center of Russian Federation, Institute for High Energy Physics, Protvino RU-142281, RussiaM. BaiCollider-Accelerator Department, Brookhaven National Laboratory, Upton, New York 11973-5000, USAG. BaksayFlorida Institute of Technology, Melbourne, Florida 32901, USAL. BaksayFlorida Institute of Technology, Melbourne, Florida 32901, USAA. 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, USAA. BasyeAbilene Christian University, Abilene, Texas 79699, USAS. BatheUniversity of California-Riverside, Riverside, California 92521, USAS. BatsouliColumbia University, New York, New York 10027, USA and Nevis Laboratories, Irvington, New York 10533, USAV. BaublisPNPI, Petersburg Nuclear Physics Institute, Gatchina, Leningrad region RU-188300, RussiaF. BauerUniversity of California-Riverside, Riverside, California 92521, USAC. BaumannInstitut fur Kernphysik, University of Muenster, D-48149 Muenster, GermanyA. BazilevskyPhysics Department, Brookhaven National Laboratory, Upton, New York 11973-5000, USAS. BelikovIowa State University, Ames, Iowa 50011, USAR. BelmontVanderbilt University, Nashville, Tennessee 37235, USAR. BennettDepartment of Physics and Astronomy, Stony Brook University, SUNY, Stony Brook, New York 11794, USAA. BerdnikovSaint Petersburg State Polytechnic University, St. Petersburg 195251, RussiaY. BerdnikovSaint Petersburg State Polytechnic University, St. Petersburg 195251, RussiaJ. BhomYonsei University, IPAP, Seoul 120-749, KoreaA. A. BickleyUniversity of Colorado, Boulder, Colorado 80309, USAM. T. BjorndalColumbia University, New York, New York 10027, USA and Nevis Laboratories, Irvington, New York 10533, USAD. BlauRussian Research Center “Kurchatov Institute,” Moscow 123098, RussiaJ. G. BoissevainLos Alamos National Laboratory, Los Alamos, New Mexico 87545, USAJ. S. BokYonsei University, IPAP, Seoul 120-749, KoreaH. BorelDapnia, CEA Saclay, F-91191 Gif-sur-Yvette, FranceN. BorggrenDepartment of Chemistry, Stony Brook University, Stony Brook, SUNY, New York 11794-3400, USAK. BoyleDepartment of Physics and Astronomy, Stony Brook University, SUNY, Stony Brook, New York 11794, USAM. L. BrooksLos Alamos National Laboratory, Los Alamos, New Mexico 87545, USAD. S. BrownNew Mexico State University, Las Cruces, New Mexico 88003, USAD. BucherInstitut fur Kernphysik, University of Muenster, D-48149 Muenster, GermanyH. BueschingPhysics Department, Brookhaven National Laboratory, Upton, New York 11973-5000, USAV. BumazhnovIHEP Protvino, State Research Center of Russian Federation, Institute for High Energy Physics, Protvino RU-142281, RussiaG. BuncePhysics Department, Brookhaven National Laboratory, Upton, New York 11973-5000, USAJ. M. Burward-HoyLos Alamos National Laboratory, Los Alamos, New Mexico 87545, USAS. ButsykDepartment of Physics and Astronomy, Stony Brook University, SUNY, Stony Brook, New York 11794, USAS. CampbellDepartment of Physics and Astronomy, Stony Brook University, SUNY, Stony Brook, New York 11794, USAA. CaringiMuhlenberg College, Allentown, Pennsylvania 18104-5586, USAJunying ChaiKAERI, Cyclotron Application Laboratory, Seoul, KoreaB. S. ChangYonsei University, IPAP, Seoul 120-749, KoreaJ. L. CharvetDapnia, CEA Saclay, F-91191 Gif-sur-Yvette, FranceC. H. ChenDepartment of Physics and Astronomy, Stony Brook University, SUNY, Stony Brook, New York 11794, USAS. ChernichenkoIHEP Protvino, State Research Center of Russian Federation, Institute for High Energy Physics, Protvino RU-142281, RussiaJ. ChibaKEK, High Energy Accelerator Research Organization, Tsukuba, Ibaraki 305-0801, JapanC. Y.Columbia University, New York, New York 10027, USA and Nevis Laboratories, Irvington, New York 10533, USAM. 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. ChoiChonbuk National University, Jeonju 561-756, KoreaR. K. ChoudhuryBhabha Atomic Research Centre, Bombay 400 085, IndiaP. ChristiansenDepartment of Physics, Lund University, Box 118, SE-221 00 Lund, SwedenT. ChujoInstitute of Physics, University of Tsukuba, Tsukuba, Ibaraki 305, JapanP. ChungDepartment of Chemistry, Stony Brook University, Stony Brook, SUNY, New York 11794-3400, USAA. ChurynIHEP Protvino, State Research Center of Russian Federation, Institute for High Energy Physics, Protvino RU-142281, RussiaO. ChválaUniversity of California-Riverside, Riverside, California 92521, USAV. CiancioloOak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USAZ. H. CitronDepartment of Physics and Astronomy, Stony Brook University, SUNY, Stony Brook, New York 11794, USAC. R. ClevenGeorgia State University, Atlanta, Georgia 30303, USAY. CobigoCEA Paris-SaclayB. A. ColeColumbia University, New York, New York 10027, USA and Nevis Laboratories, Irvington, New York 10533, USAM. P. CometsIPN-Orsay, Universite Paris Sud, CNRS-IN2P3, Boîte Postale 1, F-91406 Orsay, FranceZ. Conesa del ValleLaboratoire Leprince-Ringuet, Ecole Polytechnique, CNRS-IN2P3, Route de Saclay, F-91128 Palaiseau, FranceM. ConnorsDepartment of Physics and Astronomy, Stony Brook University, SUNY, Stony Brook, New York 11794, USAP. ConstantinIowa State University, Ames, Iowa 50011, USAM. CsanádELTE, Eötvös Loránd University, H-1117 Budapest, Pázmány Péter sétány 1/A, HungaryT. CsörgőKFKI Research Institute for Particle and Nuclear Physics of the Hungarian Academy of Sciences (MTA KFKI RMKI), P. O. Box 49, H-1525 Budapest 114, Budapest, HungaryT. DahmsDepartment of Physics and Astronomy, Stony Brook University, SUNY, Stony Brook, New York 11794, USAS. DairakuKyoto University, Kyoto 606-8502, JapanI. DanchevVanderbilt University, Nashville, Tennessee 37235, USAK. DasFlorida State University, Tallahassee, Florida 32306, USAA. DattaDepartment of Physics, University of Massachusetts, Amherst, Massachusetts 01003-9337, USAG. DavidPhysics Department, Brookhaven National Laboratory, Upton, New York 11973-5000, USAM. K. DayanandaGeorgia State University, Atlanta, Georgia 30303, USAM. B. DeatonAbilene Christian University, Abilene, Texas 79699, USAK. DehmeltFlorida Institute of Technology, Melbourne, Florida 32901, USAH. DelagrangeSUBATECH (Ecole des Mines de Nantes, CNRS-IN2P3, Université de Nantes) Boîte Postale, F-20722-44307 Nantes, FranceA. DenisovIHEP Protvino, State Research Center of Russian Federation, Institute for High Energy Physics, Protvino RU-142281, RussiaD. d’EnterriaColumbia University, New York, New York 10027, USA and Nevis Laboratories, Irvington, New York 10533, USAA. DeshpandeDepartment of Physics and Astronomy, Stony Brook University, SUNY, Stony Brook, New York 11794, USAE. J. DesmondPhysics Department, Brookhaven National Laboratory, Upton, New York 11973-5000, USA
2011lv
ABI
Аннотация
The PHENIX experiment at the Relativistic Heavy Ion Collider has performed systematic measurements of $\ensuremath{\phi}$ meson production in the ${K}^{+}{K}^{\ensuremath{-}}$ decay channel at midrapidity in $p+p$, $d+\mathrm{Au}$, $\mathrm{Cu}+\mathrm{Cu}$, and $\mathrm{Au}+\mathrm{Au}$ collisions at $\sqrt{{s}_{{}_{\mathit{NN}}}}=200 \mathrm{GeV}$. Results are presented on the $\ensuremath{\phi}$ invariant yield and the nuclear modification factor ${R}_{\mathrm{AA}}$ for $\mathrm{Au}+\mathrm{Au}$ and $\mathrm{Cu}+\mathrm{Cu}$, and ${R}_{\mathrm{dA}}$ for $d+\mathrm{Au}$ collisions, studied as a function of transverse momentum ($1<{p}_{T}<7 \mathrm{GeV}/c$) and centrality. In central and midcentral $\mathrm{Au}+\mathrm{Au}$ collisions, the ${R}_{\mathrm{AA}}$ of $\ensuremath{\phi}$ exhibits a suppression relative to expectations from binary scaled $p+p$ results. The amount of suppression is smaller than that of the ${\ensuremath{\pi}}^{0}$ and the $\ensuremath{\eta}$ in the intermediate ${p}_{T}$ range ($2\ensuremath{-}5 \mathrm{GeV}/c$), whereas, at higher ${p}_{T}$, the $\ensuremath{\phi}$, ${\ensuremath{\pi}}^{0}$, and $\ensuremath{\eta}$ show similar suppression. The baryon (proton and antiproton) excess observed in central $\mathrm{Au}+\mathrm{Au}$ collisions at intermediate ${p}_{T}$ is not observed for the $\ensuremath{\phi}$ meson despite the similar masses of the proton and the $\ensuremath{\phi}$. This suggests that the excess is linked to the number of valence quarks in the hadron rather than its mass. The difference gradually disappears with decreasing centrality, and, for peripheral collisions, the ${R}_{\mathrm{AA}}$ values for both particle species are consistent with binary scaling. $\mathrm{Cu}+\mathrm{Cu}$ collisions show the same yield and suppression as $\mathrm{Au}+\mathrm{Au}$ collisions for the same number of ${N}_{\mathrm{part}}$. The ${R}_{\mathrm{dA}}$ of $\ensuremath{\phi}$ shows no evidence for cold nuclear effects within uncertainties.
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