Quadrupole Anisotropy in Dihadron Azimuthal Correlations in Central<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>d</mml:mi><mml:mo mathvariant="bold">+</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 mathvariant="bold">=</mml:mo><mml:mn>200</mml:mn><mml:mtext> </mml:mtext><mml:mtext> </mml:mtext><mml:mi>GeV</mml:mi></mml:math>
A. AdareUniversity of Colorado, Boulder, Colorado 80309, USAC. AidalaDepartment of Physics, University of Massachusetts, Amherst, Massachusetts 01003-9337, USAN. N. AjitanandChemistry Department, Stony Brook University, SUNY, Stony Brook, 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. AlexanderChemistry Department, Stony Brook University, SUNY, Stony Brook, New York 11794-3400, USAAaron AngeramiColumbia University, New York, New York 10027 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 11794-3400, USAY. AramakiCenter for Nuclear Study, Graduate School of Science, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, JapanE. 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 11794-3400, 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, 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, USAK. N. BarishUniversity of California-Riverside, Riverside, California 92521, USAB. BassalleckUniversity of New Mexico, Albuquerque, New Mexico 87131, USAA. BasyeAbilene Christian University, Abilene, Texas 79699, USAS. BatheBaruch College, City University of New York, New York, New York 10010 USAV. BaublisPNPI, Petersburg Nuclear Physics Institute, Gatchina, Leningrad region, 188300, RussiaC. BaumannInstitut fur Kernphysik, University of Muenster, D-48149 Muenster, GermanyA. BazilevskyPhysics Department, Brookhaven National Laboratory, Upton, New York 11973-5000, USAS. BelikovPhysics Department, Brookhaven National Laboratory, Upton, New York 11973-5000, USAR. BelmontVanderbilt University, Nashville, Tennessee 37235, USAR. BennettDepartment of Physics and Astronomy, Stony Brook University, SUNY, Stony Brook, New York 11794-3400, USAJ. BhomYonsei University, IPAP, Seoul 120-749, KoreaD. BlauRussian Research Center “Kurchatov Institute”, Moscow 123098 RussiaJ. BokYonsei University, IPAP, Seoul 120-749, KoreaK. BoyleDepartment of Physics and Astronomy, Stony Brook University, SUNY, Stony Brook, New York 11794-3400, USAM. L. BrooksLos Alamos National Laboratory, Los Alamos, New Mexico 87545, USAH. 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, 142281, RussiaG. BuncePhysics Department, Brookhaven National Laboratory, Upton, New York 11973-5000, USAS. ButsykLos Alamos National Laboratory, Los Alamos, New Mexico 87545, USAS. CampbellDepartment of Physics and Astronomy, Stony Brook University, SUNY, Stony Brook, New York 11794-3400, USAA. CaringiMuhlenberg College, Allentown, Pennsylvania 18104-5586, USAC.-H. ChenDepartment of Physics and Astronomy, Stony Brook University, SUNY, Stony Brook, New York 11794-3400, USAC. Y.Columbia University, New York, New York 10027 and Nevis Laboratories, Irvington, New York 10533, USAM. ChiuPhysics Department, Brookhaven National Laboratory, Upton, New York 11973-5000, 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. ChungChemistry Department, Stony Brook University, SUNY, Stony Brook, New York 11794-3400, USAO. 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 11794-3400, USAB. A. ColeColumbia University, New York, New York 10027 and Nevis Laboratories, Irvington, New York 10533, USAZ. 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 11794-3400, USAM. CsanádELTE, Eötvös Loránd University, H-1117 Budapest, Pázmány Péter sétány 1/A, HungaryT. CsörgőInstitute for Particle and Nuclear Physics, Wigner Research Centre for Physics, Hungarian Academy of Sciences (Wigner RCP, RMKI) H-1525 Budapest 114, P.O. Box 49, Budapest, HungaryT. DahmsDepartment of Physics and Astronomy, Stony Brook University, SUNY, Stony Brook, New York 11794-3400, 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, USAA. DenisovIHEP Protvino, State Research Center of Russian Federation, Institute for High Energy Physics, Protvino, 142281, RussiaA. DeshpandeDepartment of Physics and Astronomy, Stony Brook University, SUNY, Stony Brook, New York 11794-3400, USAE. J. DesmondPhysics Department, Brookhaven National Laboratory, Upton, New York 11973-5000, USAK. V. DharmawardaneNew Mexico State University, Las Cruces, New Mexico 88003, USAO. DietzschUniversidade de São Paulo, Instituto de Física, Caixa Postal 66318, São Paulo CEP05315-970, BrazilA. DionDepartment of Physics and Astronomy, Stony Brook University, SUNY, Stony Brook, New York 11794-3400, USAM. DonadelliUniversidade de São Paulo, Instituto de Física, Caixa Postal 66318, São Paulo CEP05315-970, BrazilO. DrapierÉcole PolytechniqueA. DreesDepartment of Physics and Astronomy, Stony Brook University, SUNY, Stony Brook, New York 11794-3400, USAK. A. DreesCollider-Accelerator Department, Brookhaven National Laboratory, Upton, New York 11973-5000, USAJ. M. DurhamDepartment of Physics and Astronomy, Stony Brook University, SUNY, Stony Brook, New York 11794-3400, USAA. DurumIHEP Protvino, State Research Center of Russian Federation, Institute for High Energy Physics, Protvino, 142281, RussiaD. DuttaBhabha Atomic Research Centre, Bombay 400 085, IndiaL. D’OrazioUniversity of Maryland, College Park, Maryland 20742, USAS. EdwardsFlorida State University, Tallahassee, Florida 32306, USAY. V. EfremenkoOak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USAF. EllinghausUniversity of Colorado, Boulder, Colorado 80309, USAT. EngelmoreColumbia University, New York, New York 10027 and Nevis Laboratories, Irvington, New York 10533, USAA. EnokizonoOak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USAH. En’yoRIKEN BNL Research Center, Brookhaven National Laboratory, Upton, New York 11973-5000, USAS. EsumiInstitute of Physics, University of Tsukuba, Tsukuba, Ibaraki 305, JapanB. FademMuhlenberg College, Allentown, Pennsylvania 18104-5586, USAD. E. FieldsUniversity of New Mexico, Albuquerque, New Mexico 87131, USAM. FingerCharles University, Ovocný trh 5, Praha 1, 116 36 Prague, Czech RepublicM. FingerCharles University, Ovocný trh 5, Praha 1, 116 36 Prague, Czech RepublicF. FleuretLaboratoire Leprince-Ringuet, Ecole Polytechnique, CNRS-IN2P3, Route de Saclay, F-91128 Palaiseau, FranceS. FokinRussian Research Center “Kurchatov Institute”, Moscow 123098 RussiaZ. FraenkelWeizmann Institute, Rehovot 76100, IsraelJ. E. FrantzDepartment of Physics and Astronomy, Ohio University, Athens, Ohio 45701, USAA. FranzPhysics Department, Brookhaven National Laboratory, Upton, New York 11973-5000, USAA. D. FrawleyFlorida State University, Tallahassee, Florida 32306, USAKohei FujiwaraRIKEN Nishina Center for Accelerator-Based Science, Wako, Saitama 351-0198, JapanY. FukaoRIKEN Nishina Center for Accelerator-Based Science, Wako, Saitama 351-0198, JapanT. FusayasuNagasaki Institute of Applied Science, Nagasaki-shi, Nagasaki 851-0193, JapanI. GarishviliUniversity of Tennessee, Knoxville, Tennessee 37996, USAA. GlennLawrence Livermore National Laboratory, Livermore, California 94550, USAH. GongDepartment of Physics and Astronomy, Stony Brook University, SUNY, Stony Brook, New York 11794-3400, USA
2013lv
ABI
Abstract
The PHENIX collaboration at the Relativistic Heavy Ion Collider (RHIC) reports measurements of azimuthal dihadron correlations near midrapidity in d+Au collisions at √(s(NN))=200 GeV. These measurements complement recent analyses by experiments at the Large Hadron Collider (LHC) involving central p+Pb collisions at √(s(NN))=5.02 TeV, which have indicated strong anisotropic long-range correlations in angular distributions of hadron pairs. The origin of these anisotropies is currently unknown. Various competing explanations include parton saturation and hydrodynamic flow. We observe qualitatively similar, but larger, anisotropies in d+Au collisions at RHIC compared to those seen in p+Pb collisions at the LHC. The larger extracted v2 values in d+Au are consistent with expectations from hydrodynamic calculations owing to the larger expected initial-state eccentricity compared with that from p+Pb collisions. When both are divided by an estimate of the initial-state eccentricity the scaled anisotropies follow a common trend with multiplicity that may extend to heavy ion data at RHIC and the LHC, where the anisotropies are widely thought to arise from hydrodynamic flow.
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Cited by 20 references