Transverse momentum dependence of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>J</mml:mi><mml:mo>/</mml:mo><mml:mi>ψ</mml:mi></mml:math>polarization at midrapidity in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>p</mml:mi><mml:mo>+</mml:mo><mml:mi>p</mml:mi></mml:math>collisions at<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msqrt><mml:mi>s</mml:mi></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>
A. AdareUniversity of Colorado, Boulder, Colorado 80309, USAS. AfanasievJoint Institute for Nuclear Research, 141980 Dubna, Moscow Region, RussiaC. AidalaDepartment of Physics, University of Massachusetts, Amherst, Massachusetts 01003-9337, USAN. N. AjitanandChemistry Department, 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. AlexanderChemistry Department, Stony Brook University, Stony Brook, SUNY, New York 11794-3400, USAK. AokiKyoto University, Kyoto 606-8502, JapanL. AphecetcheSUBATECH (Ecole des Mines de Nantes, CNRS-IN2P3, Université de Nantes) BP 20722—44307, Nantes, FranceJ. AsaiRIKEN Nishina Center for Accelerator-Based Science, Wako, Saitama 351-0198, JapanE. T. AtomssaLaboratoire Leprince-Ringuet, École 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, 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. BatsouliOak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USAV. BaublisPNPI, Petersburg Nuclear Physics Institute, Gatchina, Leningrad Region, 188300, RussiaC. BaumannInstitut für 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. BennettDepartment of Physics and Astronomy, Stony Brook University, SUNY, Stony Brook, New York 11794, USAA. BerdnikovSaint Petersburg State Polytechnic University, St. Petersburg, RussiaY. BerdnikovSaint Petersburg State Polytechnic University, St. Petersburg, RussiaA. A. BickleyUniversity of Colorado, Boulder, Colorado 80309, USAJ. G. BoissevainLos Alamos National Laboratory, Los Alamos, New Mexico 87545, USAH. BorelDapnia, CEA Saclay, F-91191, Gif-sur-Yvette, FranceK. 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, 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, USAC. Muñoz CamachoLos Alamos National Laboratory, Los Alamos, New Mexico 87545, USAS. CampbellDepartment of Physics and Astronomy, Stony Brook University, SUNY, Stony Brook, New York 11794, USAB. S. ChangYonsei University, IPAP, Seoul 120-749, KoreaW. C. ChangInstitute of Physics, Academia Sinica, Taipei 11529, TaiwanJ. L. CharvetDapnia, CEA Saclay, F-91191, Gif-sur-Yvette, FranceS. ChernichenkoIHEP Protvino, State Research Center of Russian Federation, Institute for High Energy Physics, Protvino, 142281, RussiaC. Y.Columbia University, New York, New York 10027, and Nevis Laboratories, Irvington, New York 10533, USAM. ChiuUniversity of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USAI. J. ChoiYonsei University, IPAP, Seoul 120-749, KoreaR. K. ChoudhuryBhabha Atomic Research Centre, Bombay 400 085, IndiaT. ChujoInstitute of Physics, University of Tsukuba, Tsukuba, Ibaraki 305, JapanP. ChungChemistry Department, 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, 142281, RussiaV. CiancioloOak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USAZ. H. CitronDepartment of Physics and Astronomy, Stony Brook University, SUNY, Stony Brook, New York 11794, USAB. ColeColumbia University, New York, New York 10027, and Nevis Laboratories, Irvington, New York 10533, USAZ. Conesa del ValleLaboratoire Leprince-Ringuet, École Polytechnique, CNRS-IN2P3, Route de Saclay, F-91128, Palaiseau, FranceP. ConstantinLos Alamos National Laboratory, Los Alamos, New Mexico 87545, USAM. CsanádELTE, Eötvös Loránd University, H-1117 Budapest, Pázmány P. s. 1/A, HungaryT. CsörgőKFKI Research Institute for Particle and Nuclear Physics of the Hungarian Academy of Sciences (MTA KFKI 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, USAS. DairakuKyoto University, Kyoto 606-8502, JapanK. DasFlorida State University, Tallahassee, Florida 32306, USAG. DavidPhysics Department, Brookhaven National Laboratory, Upton, New York 11973-5000, USAA. DenisovIHEP Protvino, State Research Center of Russian Federation, Institute for High Energy Physics, Protvino, 142281, RussiaD. d’EnterriaLaboratoire Leprince-Ringuet, École Polytechnique, CNRS-IN2P3, Route de Saclay, F-91128, Palaiseau, FranceA. 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, 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, USAM. DonadelliUniversidade de São Paulo, Instituto de Física, Caixa Postal 66318, São Paulo CEP05315-970, BrazilO. DrapierLaboratoire Leprince-Ringuet, École Polytechnique, CNRS-IN2P3, Route de Saclay, F-91128, Palaiseau, FranceA. DreesDepartment of Physics and Astronomy, Stony Brook University, SUNY, Stony Brook, New York 11794, USAK. A. DreesCollider-Accelerator Department, Brookhaven National Laboratory, Upton, New York 11973-5000, USAA. K. DubeyWeizmann Institute, Rehovot 76100, IsraelA. DurumIHEP Protvino, State Research Center of Russian Federation, Institute for High Energy Physics, Protvino, 142281, RussiaDipanwita DuttaBhabha Atomic Research Centre, Bombay 400 085, IndiaV. DzhordzhadzeUniversity of California-Riverside, Riverside, California 92521, USAY. 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. EnokizonoLawrence Livermore National Laboratory, Livermore, California 94550, USAH. En’yoRIKEN BNL Research Center, Brookhaven National Laboratory, Upton, New York 11973-5000, USAS. EsumiInstitute of Physics, University of Tsukuba, Tsukuba, Ibaraki 305, JapanO. EyserUniversity of California-Riverside, Riverside, California 92521, USAB. FademMuhlenberg College, Allentown, Pennsylvania 18104-5586, USAD. E. FieldsRIKEN BNL Research Center, Brookhaven National Laboratory, Upton, New York 11973-5000, 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, École Polytechnique, CNRS-IN2P3, Route de Saclay, F-91128, Palaiseau, FranceS. FokinRussian Research Center Kurchatov Institute, Moscow, RussiaZ. FraenkelWeizmann Institute, Rehovot 76100, IsraelJ. E. FrantzDepartment of Physics and Astronomy, Stony Brook University, SUNY, Stony Brook, New York 11794, 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. FukaoKyoto University, Kyoto 606-8502, JapanT. FusayasuNagasaki Institute of Applied Science, Nagasaki-shi, Nagasaki 851-0193, JapanI. GarishviliUniversity of Tennessee, Knoxville, Tennessee 37996, USA
2010lv
ABI
Аннотация
We report the measurement of the transverse momentum dependence of inclusive $J/\ensuremath{\psi}$ polarization in $p+p$ collisions at $\sqrt{s}=200\text{ }\text{ }\mathrm{GeV}$ performed by the PHENIX Experiment at the Relativistic Heavy Ion Collider. The $J/\ensuremath{\psi}$ polarization is studied in the helicity, Gottfried-Jackson, and Collins-Soper frames for ${p}_{T}<5\text{ }\text{ }\mathrm{GeV}/c$ and $|y|<0.35$. The polarization in the helicity and Gottfried-Jackson frames is consistent with zero for all transverse momenta, with a slight (1.8 sigma) trend towards longitudinal polarization for transverse momenta above $2\text{ }\text{ }\mathrm{GeV}/c$. No conclusion is allowed due to the limited acceptance in the Collins-Soper frame and the uncertainties of the current data. The results are compared to observations for other collision systems and center of mass energies and to different quarkonia production models.
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