Production of ω mesons at large transverse momenta in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>p</mml:mi></mml:mrow><mml:mo>+</mml:mo><mml:mrow><mml:mi>p</mml:mi></mml:mrow></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>d</mml:mi></mml:mrow></mml:math>+Au 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:mrow></mml:math>GeV
Stephen AdlerBrookhaven National Laboratory, Upton, New York 11973-5000, USAS. AfanasievJoint Institute for Nuclear Research, RU-141980 Dubna, Moscow Region, RussiaC. AidalaColumbia University, New York, New York 10027 and Nevis Laboratories, Irvington, New York 10533, USAN. N. AjitanandChemistry Department, Stony Brook University, Stony Brook, SUNY, New York 11794-3400, USAY. AkibaKEK, High Energy Accelerator Research Organization, Tsukuba, Ibaraki 305-0801, JapanA. Al-JamelNew 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, FranceR. ArméndarizNew Mexico State University, Las Cruces, New Mexico 88003, USAS. 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, USAV. BabintsevIHEP Protvino, State Research Center of Russian Federation, Institute for High Energy Physics, Protvino, RU-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 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, USAA. BazilevskyBrookhaven National Laboratory, Upton, New York 11973-5000, USAS. BelikovIHEP Protvino, State Research Center of Russian Federation, Institute for High Energy Physics, Protvino, RU-142281, RussiaM. T. BjorndalColumbia University, New York, New York 10027 and Nevis Laboratories, Irvington, New York 10533, USAJ. G. BoissevainLos Alamos National Laboratory, Los Alamos, New Mexico 87545, USAH. BorelDapnia, CEA Saclay, F-91191, Gif-sur-Yvette, 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. BueschingBrookhaven 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. BunceBrookhaven 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, FranceP. 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, RU-142281, RussiaC. Y.Columbia University, New York, New York 10027 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 and Nevis Laboratories, Irvington, New York 10533, USAI. J. ChoiYonsei University, IPAP, Seoul 120-749, 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 and Nevis Laboratories, Irvington, New York 10533, USAM. P. CometsIPN-Orsay, Universite Paris Sud, CNRS-IN2P3, BP1, F-91406, Orsay, FranceP. ConstantinIowa State University, Ames, Illinois 50011, 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, HungaryJ. P. CussonneauSUBATECH (Ecole des Mines de Nantes, CNRS-IN2P3, Université de Nantes) BP 20722-44307, Nantes, FranceD. d’EnterriaColumbia University, New York, New York 10027 and Nevis Laboratories, Irvington, New York 10533, USAK. DasFlorida State University, Tallahassee, Florida 32306, USAG. DavidBrookhaven National Laboratory, Upton, New York 11973-5000, USAF. DeákELTE, Eötvös Loránd University, H-1117 Budapest, Pázmány P. s. 1/A, HungaryH. 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, RU-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. DietzschUniversidade de São Paulo, Instituto de Física, Caixa Postal 66318, São Paulo CEP05315-970, BrazilJ. L. DrachenbergAbilene Christian University, Abilene, Texas 79699, USAO. 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, USAA. DurumIHEP Protvino, State Research Center of Russian Federation, Institute for High Energy Physics, Protvino, RU-142281, RussiaDipanwita DuttaBhabha Atomic Research Centre, Bombay 400 085, IndiaV. DzhordzhadzeUniversity of Tennessee, Knoxville, Tennessee 37996, USAY. V. EfremenkoOak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USAH. En’yoRIKEN (The Institute of Physical and Chemical Research), Wako, Saitama 351-0198, JapanB. EspagnonIPN-Orsay, Universite Paris Sud, CNRS-IN2P3, BP1, F-91406, Orsay, FranceS. EsumiInstitute of Physics, University of Tsukuba, Tsukuba, Ibaraki 305, JapanD. E. FieldsRIKEN BNL Research CenterC. FinckSUBATECH (Ecole des Mines de Nantes, CNRS-IN2P3, Université de Nantes) BP 20722-44307, Nantes, FranceF. 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 and Nevis Laboratories, Irvington, New York 10533, USAA. FranzBrookhaven National Laboratory, Upton, New York 11973-5000, USAA. D. FrawleyFlorida State University, Tallahassee, Florida 32306, USAY. FukaoKyoto University, Kyoto 606-8502, JapanS.-Y. FungUniversity of California-Riverside, Riverside, California 92521, USAS. GadratLPC, Université Blaise Pascal, CNRS-IN2P3, Clermont-Fd, F-63177 Aubiere Cedex, FranceM. GermainSUBATECH (Ecole des Mines de Nantes, CNRS-IN2P3, Université de Nantes) BP 20722-44307, Nantes, FranceA. GlennUniversity 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 (The Institute of Physical and Chemical Research), Wako, Saitama 351-0198, JapanR. Granier de CassagnacLaboratoire Leprince-Ringuet, Ecole Polytechnique, CNRS-IN2P3, Route de Saclay, F-91128, Palaiseau, FranceN. GrauIowa State University, Ames, Illinois 50011, USAS. V. GreeneVanderbilt University, Nashville, Tennessee 37235, USAM. Gross PerdekampRIKEN BNL Research Center, Brookhaven 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, USA
2007lv
ABI
Аннотация
The PHENIX experiment at RHIC has measured the invariant cross section for \ensuremath{\omega}-meson production at midrapidity in the transverse momentum range $2.5<{p}_{T}<9.25$ GeV/$c$ in $p+p$ and $d$+Au collisions at $\sqrt{{s}_{\mathit{NN}}}=200$ GeV. Measurements in two decay channels ($\ensuremath{\omega}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{0}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ and $\ensuremath{\omega}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{0}\ensuremath{\gamma}$) yield consistent results, and the reconstructed \ensuremath{\omega} mass agrees with the accepted value within the ${p}_{T}$ range of the measurements. The $\ensuremath{\omega}/{\ensuremath{\pi}}^{0}$ ratio is found to be $0.85\ifmmode\pm\else\textpm\fi{}0.{05}^{\mathrm{stat}}\ifmmode\pm\else\textpm\fi{}0.{09}^{\mathrm{sys}}$ in $p+p$ and $0.94\ifmmode\pm\else\textpm\fi{}0.{08}^{\mathrm{stat}}\ifmmode\pm\else\textpm\fi{}0.{12}^{\mathrm{sys}}$ in $d$+Au collisions, independent of ${p}_{T}$. The nuclear modification factor ${R}_{d\mathrm{A}}^{\ensuremath{\omega}}$ is $1.03\ifmmode\pm\else\textpm\fi{}0.{12}^{\mathrm{stat}}\ifmmode\pm\else\textpm\fi{}0.{21}^{\mathrm{sys}}$ and $0.83\ifmmode\pm\else\textpm\fi{}0.{21}^{\mathrm{stat}}\ifmmode\pm\else\textpm\fi{}0.{17}^{\mathrm{sys}}$ in minimum bias and central (0--20%) $d$+Au collisions, respectively.
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