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Measurement of single muons at forward rapidity in p+p collisions at s=200 GeV and implications for charm production

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Physical review d 2007年第9期76卷 092002-092002页

作者： S. S. Adler S. Afanasiev C. Aidala N. N. Ajitanand Y. Akiba J. Alexander r. Amirikas L. Aphecetche S. H. Aronson r. Averbeck T. C. Awes r. Azmoun V. Babintsev A. Baldisseri K. N. Barish P. d. Barnes B. Bassalleck S. Bathe S. Batsouli V. Baublis A. Bazilevsky S. Belikov Y. Berdnikov S. Bhagavatula J. G. Boissevain H. Borel S. Borenstein M. L. Brooks d. S. Brown N. Bruner d. Bucher H. Buesching V. Bumazhnov G. Bunce J. M. Burward-Hoy S. Butsyk X. Camard J.-S. Chai P. Chand W. C. Chang S. Chernichenko C. Y. Chi J. Chiba M. Chiu I. J. Choi J. Choi r. K. Choudhury T. Chujo V. Cianciolo Y. Cobigo B. A. Cole P. Constantin d. d’Enterria G. david H. delagrange A. denisov A. deshpande E. J. desmond A. devismes O. dietzsch O. drapier A. drees K. A. drees r. du rietz A. durum d. dutta Y. V. Efremenko K. El Chenawi A. Enokizono H. En’yo S. Esumi L. Ewell d. E. Fields F. Fleuret S. L. Fokin B. d. Fox Z. Fraenkel J. E. Frantz A. Franz A. d. Frawley S.-Y. Fung S. Garpman T. K. Ghosh A. Glenn G. Gogiberidze M. Gonin J. Gosset Y. Goto r. Granier de Cassagnac N. Grau S. V. Greene M. Grosse Perdekamp W. Guryn H.-Å. Gustafsson T. Hachiya J. S. Haggerty H. Hamagaki A. G. Hansen E. P. Hartouni M. Harvey r. Hayano N. Hayashi X. He M. Heffner T. K. Hemmick J. M. Heuser M. Hibino J. C. Hill W. Holzmann K. Homma B. Hong A. Hoover d. Hornback T. Ichihara V. V. Ikonnikov K. Imai d. Isenhower M. Ishihara M. Issah A. Isupov B. V. Jacak W. Y. Jang Y. Jeong J. Jia O. Jinnouchi B. M. Johnson S. C. Johnson K. S. Joo d. Jouan S. Kametani N. Kamihara J. H. Kang S. S. Kapoor K. Katou S. Kelly B. Khachaturov A. Khanzadeev J. Kikuchi d. H. Kim d. J. Kim d. W. Kim E. Kim G.-B. Kim H. J. Kim E. Kistenev A. Kiyomichi K. Kiyoyama C. Klein-Boesing H. Kobayashi L. Kochenda V. Kochetkov d. Koehler T. Kohama M. Kopytine d. Kotchetkov A. Kozlov P. J. Kroon C. H. Kuberg K. Kurita Y. Kuroki M. J. Kweon Y. Kwon G. S. Kyle r. Lacey V. Ladygin J. G. Lajoie A. Lebedev S. Leckey d. M. Lee S. Lee M. J. Leitch X. H. Li H. Lim A. Litvinenko M. X. Liu Y. Liu C. F. Maguire Brookhaven National Laboratory Upton New York 11973-5000 USA Joint Institute for Nuclear Research 141980 Dubna Moscow Region Russia Chemistry Department Stony Brook University SUNY Stony Brook New York 11794-3400 USA KEK High Energy Accelerator Research Organization Tsukuba-shi Ibaraki-ken 305-0801 Japan RIKEN (The Institute of Physical and Chemical Research) Wako Saitama 351-0198 Japan Florida State University Tallahassee Florida 32306 USA SUBATECH (Ecole des Mines de Nantes CNRS-IN2P3 Université de Nantes) BP 20722 - 44307 Nantes France Department of Physics and Astronomy Stony Brook University SUNY Stony Brook New York 11794 USA Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA Institute for High Energy Physics (IHEP) Protvino Russia Dapnia CEA Saclay F-91191 Gif-sur-Yvette France University of California-Riverside Riverside California 92521 USA Los Alamos National Laboratory Los Alamos New Mexico 87545 USA University of New Mexico Albuquerque New Mexico 87131 USA Institut für Kernphysik University of Muenster D-48149 Muenster Germany Columbia University New York New York 10027 and Nevis Laboratories Irvington New York 10533 USA PNPI Petersburg Nuclear Physics Institute Gatchina Russia RIKEN BNL Research Center Brookhaven National Laboratory Upton New York 11973-5000 USA Iowa State University Ames Iowa 50011 USA St. Petersburg State Technical University St. Petersburg Russia Laboratoire Leprince-Ringuet Ecole Polytechnique CNRS-IN2P3 Route de Saclay F-91128 Palaiseau France New Mexico State University Las Cruces New Mexico 88003 USA Lawrence Livermore National Laboratory Livermore California 94550 USA KAERI Cyclotron Application Laboratory Seoul South Korea Bhabha Atomic Research Centre Bombay 400 085 India Institute of Physics Academia Sinica Taipei 11529 Taiwan Yonsei University IPAP Seoul 120-749 Korea Kangnung National University Kangnung 210-702 South Korea Universidade de São Paulo Instituto de Física

Muon production at forward rapidity (1.5≤|η|≤1.8) has been measured by the PHENIX experiment over the transverse momentum range 1≤pT≤3 GeV/c in s=200 GeV p+p collisions at the relativistic Heavy Ion Collider. After statistically subtracting contributions from light hadron decays an excess remains which is attributed to the semileptonic decays of hadrons carrying heavy flavor, i.e. charm quarks or, at high pT, bottom quarks. The resulting muon spectrum from heavy flavor decays is compared to PYTHIA and a next-to-leading-order perturbative QCd calculation. PYTHIA is used to determine the charm quark spectrum that would produce the observed muon excess. The corresponding differential cross section for charm quark production at forward rapidity is determined to be dσcc¯/dy|y=1.6=0.243±0.013(stat.)±0.105(data syst.)+0.049−0.087(PYTHIA syst.) mb.

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detailed study of high-pT neutral pion suppression and azimuthal anisotropy in Au+Au collisions at sNN=200 GeV

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Physical review C 2007年第3期76卷 034904-034904页

作者： S. S. Adler S. Afanasiev C. Aidala N. N. Ajitanand Y. Akiba J. Alexander r. Amirikas L. Aphecetche S. H. Aronson r. Averbeck T. C. Awes r. Azmoun V. Babinstev A. Baldisseri K. N. Barish P. d. Barnes B. Bassalleck S. Bathe S. Batsouli V. Baublis A. Bazilevsky S. Belikov Y. Berndnikov S. Bhagavatula J. G. Boissevain H. Borel S. Borenstein M. L. Brooks d. S. Brown N. Bruner d. Bucher H. Buesching V. Bumazhnov G. Bunce J. M. Burward-Hoy S. Butsyk X. Camard J.-S. Chai P. Chand W. C. Chang S. Chernichenko C. Y. Chi J. Chiba M. Chiu I. J. Choi J. Choi r. K. Choudhury T. Chujo V. Cianciolo Y. Cobigo B. A. Cole P. Constantin d. d'Enterria G. david H. delagrange A. denisov A. deshpande E. J. desmond A. devismes O. dietzsch O. drapier A. drees K. A. drees r. du rietz A. durum d. dutta Y. V. Efremenko K. El Chenawi A. Enokizono H. En'yo S. Esumi L. Ewell d. E. Fields F. Fleuret S. L. Fokin B. d. Fox Z. Fraenkel J. E. Frantz A. Franz A. d. Frawley S.-Y. Fung S. Garpman T. K. Ghosh A. Glenn G. Gogiberidze M. Gonin J. Gosset Y. Goto r. Granier de Cassagnac N. Grau S. V. Greene M. Grosse Perdekamp W. Guryn H.-Å. Gustafsson T. Hachiya J. S. Haggerty H. Hamagaki A. G. Hansen E. P. Hartouni M. Harvey r. Hayano N. Hayashi X. He M. Heffner T. K. Hemmick J. M. Heuser M. Hibino J. C. Hill W. Holzmann K. Homma B. Hong A. Hoover T. Ichihara V. V. Ikonnikov K. Imai d. Isenhower M. Ishihara M. Issah A. Isupov B. V. Jacak W. Y. Jang Y. Jeong J. Jia O. Jinnouchi B. M. Johnson S. C. Johnson K. S. Joo d. Jouan S. Kametani N. Kamihara J. H. Kang S. S. Kapoor K. Katou S. Kelly B. Khachaturov A. Khanzadeev J. Kikuchi d. H. Kim d. J. Kim d. W. Kim E. Kim G.-B. Kim H. J. Kim E. Kistenev A. Kiyomichi K. Kiyoyama C. Klein-Boesing H. Kobayashi L. Kochenda V. Kochetkov d. Koehler T. Kohama M. Kopytine d. Kotchetkov A. Kozlov P. J. Kroon C. H. Kuberg K. Kurita Y. Kuroki M. J. Kweon Y. Kwon G. S. Kyle r. Lacey V. Ladygin J. G. Lajoie A. Lebedev S. Leckey d. M. Lee S. Lee M. J. Leitch X. H. Li H. Lim A. Litvinenko M. X. Liu Y. Liu C. F. Maguire Y. I. Makd Brookhaven National Laboratory Upton New York 11973-5000 USA Joint Institute for Nuclear Research 141980 Dubna Moscow Region Russia Chemistry Department Stony Brook University SUNY Stony Brook New York 11794-3400 USA KEK High Energy Accelerator Research Organization Tsukuba-shi Ibaraki-ken 305-0801 Japan RIKEN (The Institute of Physical and Chemical Research) Wako Saitama 351-0198 JAPAN Florida State University Tallahassee Florida 32306 USA SUBATECH (Ecole des Mines de Nantes CNRS-IN2P3 Université de Nantes) BP 20722 - 44307 Nantes France Department of Physics and Astronomy Stony Brook University SUNY Stony Brook New York 11794 USA Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA Institute for High Energy Physics (IHEP) Protvino Russia Dapnia CEA Saclay F-91191 Gif-sur-Yvette France University of California - Riverside Riverside California 92521 USA Los Alamos National Laboratory Los Alamos New Mexico 87545 USA University of New Mexico Albuquerque New Mexico 87131 USA Institut für Kernphysik University of Muenster D-48149 Muenster Germany Columbia University New York New York 10027 and Nevis Laboratories Irvington New York 10533 USA PNPI Petersburg Nuclear Physics Institute Gatchina Russia RIKEN BNL Research Center Brookhaven National Laboratory Upton New York 11973-5000 USA Iowa State University Ames Iowa 50011 USA St. Petersburg State Technical University St. Petersburg Russia Laboratoire Leprince-Ringuet Ecole Polytechnique CNRS-IN2P3 Route de Saclay F-91128 Palaiseau France New Mexico State University Las Cruces New Mexico 88003 USA Lawrence Livermore National Laboratory Livermore California 94550 USA KAERI Cyclotron Application Laboratory Seoul South Korea Bhabha Atomic Research Centre Bombay 400 085 India Institute of Physics Academia Sinica Taipei 11529 Taiwan Yonsei University IPAP Seoul 120-749 Korea Kangnung National University Kangnung 210-702 South Korea Universidade de São Paulo Instituto de Físic

Measurements of neutral pion (π0) production at midrapidity in sNN=200 GeV Au+Au collisions as a function of transverse momentum, pT, collision centrality, and angle with respect to reaction plane are presented. The data represent the final π0 results from the PHENIX experiment for the first rHIC Au+Au run at design center-of-mass energy. They include additional data obtained using the PHENIX Level-2 trigger with more than a factor of 3 increase in statistics over previously published results for pT>6 GeV/c. We evaluate the suppression in the yield of high-pT π0's relative to pointlike scaling expectations using the nuclear modification factor rAA. We present the pT dependence of rAA for nine bins in collision centrality. We separately integrate rAA over larger pT bins to show more precisely the centrality dependence of the high-pT suppression. We then evaluate the dependence of the high-pT suppression on the emission angle Δϕ of the pions with respect to event reaction plane for seven bins in collision centrality. We show that the yields of high-pT π0's vary strongly with Δϕ, consistent with prior measurements [1,2]. We show that this variation persists in the most peripheral bin accessible in this analysis. For the peripheral bins we observe no suppression for neutral pions produced aligned with the reaction plane, whereas the yield of π0's produced perpendicular to the reaction plane is suppressed by a factor of ~2. We analyze the combined centrality and Δϕ dependence of the π0 suppression in different pT bins using different possible descriptions of parton energy loss dependence on jet path-length averages to determine whether a single geometric picture can explain the observed suppression pattern.

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Measurement of density correlations in pseudorapidity via charged particle multiplicity fluctuations in Au+Au collisions at sNN=200 GeV

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Physical review C 2007年第3期76卷 034903-034903页

作者： S. S. Adler S. Afanasiev C. Aidala N. N. Ajitanand Y. Akiba J. Alexander r. Amirikas L. Aphecetche S. H. Aronson r. Averbeck T. C. Awes r. Azmoun V. Babintsev A. Baldisseri K. N. Barish P. d. Barnes B. Bassalleck S. Bathe S. Batsouli V. Baublis A. Bazilevsky S. Belikov Y. Berdnikov S. Bhagavatula J. G. Boissevain H. Borel S. Borenstein M. L. Brooks d. S. Brown N. Bruner d. Bucher H. Buesching V. Bumazhnov G. Bunce J. M. Burward-Hoy S. Butsyk X. Camard J.-S. Chai P. Chand W. C. Chang S. Chernichenko C. Y. Chi J. Chiba M. Chiu I. J. Choi J. Choi r. K. Choudhury T. Chujo V. Cianciolo Y. Cobigo B. A. Cole P. Constantin d. d'Enterria G. david H. delagrange A. denisov A. deshpande E. J. desmond A. devismes O. dietzsch O. drapier A. drees K. A. drees A. durum d. dutta Y. V. Efremenko K. El Chenawi A. Enokizono H. En'yo S. Esumi L. Ewell d. E. Fields F. Fleuret S. L. Fokin B. d. Fox Z. Fraenkel J. E. Frantz A. Franz A. d. Frawley S.-Y. Fung S. Garpman T. K. Ghosh A. Glenn G. Gogiberidze M. Gonin J. Gosset Y. Goto r. Granier de Cassagnac N. Grau S. V. Greene M. Grosse Perdekamp W. Guryn H.-Å. Gustafsson T. Hachiya J. S. Haggerty H. Hamagaki A. G. Hansen E. P. Hartouni M. Harvey r. Hayano N. Hayashi X. He H. W. van Hecke M. Heffner T. K. Hemmick J. M. Heuser M. Hibino J. C. Hill W. Holzmann K. Homma B. Hong A. Hoover T. Ichihara V. V. Ikonnikov K. Imai d. Isenhower M. Ishihara M. Issah A. Isupov B. V. Jacak W. Y. Jang Y. Jeong J. Jia O. Jinnouchi B. M. Johnson S. C. Johnson K. S. Joo d. Jouan S. Kametani N. Kamihara J. H. Kang S. S. Kapoor K. Katou S. Kelly B. Khachaturov A. Khanzadeev J. Kikuchi d. H. Kim d. J. Kim d. W. Kim E. Kim G.-B. Kim H. J. Kim E. Kistenev A. Kiyomichi K. Kiyoyama C. Klein-Boesing H. Kobayashi L. Kochenda V. Kochetkov d. Koehler T. Kohama M. Kopytine d. Kotchetkov A. Kozlov P. J. Kroon C. H. Kuberg K. Kurita Y. Kuroki M. J. Kweon Y. Kwon G. S. Kyle r. Lacey V. Ladygin J. G. Lajoie A. Lebedev S. Leckey d. M. Lee S. Lee M. J. Leitch X. H. Li H. Lim A. Litvinenko M. X. Liu Y. Liu C. F. Maguire Y. I. M Brookhaven National Laboratory Upton New York 11973-5000 USA Joint Institute for Nuclear Research RU-141980 Dubna Moscow Region Russia Chemistry Department Stony Brook University SUNY Stony Brook New York 11794-3400 USA KEK High Energy Accelerator Research Organization Tsukuba-shi Ibaraki-ken 305-0801 Japan RIKEN (The Institute of Physical and Chemical Research) Wako Saitama 351-0198 Japan Florida State University Tallahassee Florida 32306 USA SUBATECH (Ecole des Mines de Nantes CNRS-IN2P3 Université de Nantes) Boîte Postal F-20722-44307 Nantes France Department of Physics and Astronomy Stony Brook University SUNY Stony Brook New York 11794 USA Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA Institute for High Energy Physics (IHEP) Protvino Russia Dapnia CEA Saclay F-91191 Gif-sur-Yvette France University of California-Riverside Riverside California 92521 USA Los Alamos National Laboratory Los Alamos New Mexico 87545 USA University of New Mexico Albuquerque New Mexico 87131 USA Institut für Kernphysik University of Muenster D-48149 Muenster Germany Columbia University New York 10027 USA and Nevis Laboratories Irvington New York 10533 USA PNPI Petersburg Nuclear Physics Institute Gatchina Russia RIKEN BNL Research Center Brookhaven National Laboratory Upton New York 11973-5000 USA Iowa State University Ames Iowa 50011 USA St. Petersburg State Technical University St. Petersburg Russia Laboratoire Leprince-Ringuet Ecole Polytechnique CNRS-IN2P3 Route de Saclay F-91128 Palaiseau France New Mexico State University Las Cruces New Mexico 88003 USA Lawrence Livermore National Laboratory Livermore California 94550 USA KAERI Cyclotron Application Laboratory Seoul South Korea Bhabha Atomic Research Centre Bombay 400 085 India Institute of Physics Academia Sinica Taipei 11529 Taiwan Yonsei University IPAP Seoul 120-749 Korea Kangnung National University Kangnung 210-702 South Korea Universidade de São Paulo Instituto d

Longitudinal density correlations of produced matter in Au+Au collisions at sNN=200 GeV have been measured from the inclusive charged particle distributions as a function of pseudorapidity window sizes. The extracted αξ parameter, related to the susceptibility of the density fluctuations in the long-wavelength limit, exhibits a nonmonotonic behavior as a function of the number of participant nucleons, Npart. A local maximum is seen at Npart~90, with corresponding energy density based on the Bjorken picture of εBjτ~2.4 GeV/(fm2c) with a transverse area size of 60 fm2. This behavior may suggest a critical phase boundary based on the Ginzburg-Landau framework.

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High transverse momentum η meson production in p+p,d+Au, and Au+Au collisions at sNN=200 GeV

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Physical review C 2007年第2期75卷 024909-024909页

作者： S. S. Adler S. Afanasiev C. Aidala N. N. Ajitanand Y. Akiba J. Alexander A. Al-Jamel r. Amirikas K. Aoki L. Aphecetche r. Armendariz S. H. Aronson r. Averbeck T. C. Awes r. Azmoun V. Babintsev A. Baldisseri K. N. Barish P. d. Barnes B. Bassalleck S. Bathe S. Batsouli V. Baublis F. Bauer A. Bazilevsky S. Belikov Y. Berdnikov S. Bhagavatula M. T. Bjorndal J. G. Boissevain H. Borel S. Borenstein M. L. Brooks d. S. Brown N. Bruner d. Bucher H. Buesching V. Bumazhnov G. Bunce J. M. Burward-Hoy S. Butsyk X. Camard J.-S. Chai P. Chand W. C. Chang S. Chernichenko J. Chiba C. Y. Chi M. Chiu I. J. Choi J. Choi r. K. Choudhury T. Chujo V. Cianciolo Y. Cobigo B. A. Cole M. P. Comets P. Constantin M. Csanád T. Csörgő J. P. Cussonneau K. das G. david F. deák H. delagrange A. denisov d. d'Enterria A. deshpande E. J. desmond A. devismes O. dietzsch J. L. drachenberg O. drapier A. drees K. A. drees r. durietz A. durum d. dutta V. dzhordzhadze Y. V. Efremenko K. El. Chenawi A. Enokizono H. En'yo B. Espagnon S. Esumi L. Ewell d. E. Fields C. Finck F. Fleuret S. L. Fokin B. d. Fox Z. Fraenkel J. E. Frantz A. Franz A. d. Frawley Y. Fukao S.-Y. Fung S. Gadrat S. Garpman M. Germain T. K. Ghosh A. Glenn G. Gogiberidze M. Gonin J. Gosset Y. Goto r. Granier de Cassagnac N. Grau S. V. Greene M. Grosse. Perdekamp W. Guryn H.-Å. Gustafsson T. Hachiya J. S. Haggerty H. Hamagaki A. G. Hansen E. P. Hartouni M. Harvey K. Hasuko r. Hayano N. Hayashi M. Heffner T. K. Hemmick J. M. Heuser X. He M. Hibino P. Hidas H. Hiejima J. C. Hill r. Hobbs W. Holzmann K. Homma B. Hong A. Hoover T. Horaguchi T. Ichihara V. V. Ikonnikov K. Imai M. Inaba M. Inuzuka d. Isenhower L. Isenhower M. Ishihara M. Issah A. Isupov B. V. Jacak W. Y. Jang Y. Jeong J. Jia O. Jinnouchi B. M. Johnson S. C. Johnson K. S. Joo d. Jouan F. Kajihara S. Kametani N. Kamihara M. Kaneta J. H. Kang S. S. Kapoor K. Katou M. Kaufman T. Kawabata A. V. Kazantsev S. Kelly B. Khachaturov A. Khanzadeev J. Kikuchi d. H. Kim d. J. Kim d. W. Kim E. Kim G.-B. Kim H. J. Kim E. Kinney A. Kiss E. Kiste Brookhaven National Laboratory Upton New York 11973-5000 USA Joint Institute for Nuclear Research RU-141980 Dubna Moscow Region Russia Columbia University New York NY 10027 and Nevis Laboratories Irvington New York 10533 USA Chemistry Department Stony Brook University Stony Brook SUNY New York 11794-3400 USA KEK High Energy Accelerator Research Organization Tsukuba Ibaraki 305-0801 Japan RIKEN (The Institute of Physical and Chemical Research) Wako Saitama 351-0198 JAPAN New Mexico State University Las Cruces New Mexico 88003 USA Florida State University Tallahassee Florida 32306 USA Kyoto University Kyoto 606-8502 Japan SUBATECH (Ecole des Mines de Nantes CNRS-IN2P3 Université de Nantes) BP 20722 F-44307 Nantes France Department of Physics and Astronomy Stony Brook University SUNY Stony Brook New York 11794 USA Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA IHEP Protvino State Research Center of Russian Federation Institute for High Energy Physics Protvino RU-142281 Russia Dapnia CEA Saclay F-91191 Gif-sur-Yvette France University of California-Riverside Riverside California 92521 USA Los Alamos National Laboratory Los Alamos New Mexico 87545 USA University of New Mexico Albuquerque New Mexico 87131 USA Institut für Kernphysik University of Muenster D-48149 Muenster Germany PNPI Petersburg Nuclear Physics Institute Gatchina Leningrad region RU-188300 Russia RIKEN BNL Research Center Brookhaven National Laboratory Upton New York 11973-5000 USA Iowa State University Ames Iowa 50011 USA Saint Petersburg State Polytechnic University St. Petersburg Russia Laboratoire Leprince-Ringuet Ecole Polytechnique CNRS-IN2P3 Route de Saclay F-91128 Palaiseau France Lawrence Livermore National Laboratory Livermore California 94550 USA KAERI Cyclotron Application Laboratory Seoul South Korea Bhabha Atomic Research Centre Bombay 400 085 India Institute of Physics Academia Sinica Taipei 11529 Taiwan Yonsei University IPAP S

Inclusive transverse momentum spectra of η mesons in the range pT≈2–12 GeV/c have been measured at midrapidity (|η|<0.35) by the PHENIX experiment at rHIC in p+p,d+Au, and Au+Au collisions at sNN=200 GeV. The η mesons are reconstructed through their η→γ γ channel for the three colliding systems as well as through the η→π0π+π− decay mode in p+p and d+Au collisions. The nuclear modification factor in d+Au collisions, rdAu(pT)≈1.0–1.1, suggests at most only modest pT broadening (“Cronin enhancement”). In central Au+Au reactions, the η yields are significantly suppressed, with rAuAu(pT)≈0.2. The ratio of η to π0 yields is approximately constant as a function of pT for the three colliding systems in agreement with the high-pT world average of rη/π0≈0.5 in hadron-hadron, hadron-nucleus, and nucleus-nucleus collisions for a wide range of center-of-mass energies (sNN≈3–1800 GeV) as well as, for high scaled momentum xp, in e+e− annihilations at s=91.2 GeV. These results are consistent with a scenario where high-pT η production in nuclear collisions at the relativistic Heavy Ion Collider is largely unaffected by initial-state effects but where light-quark mesons (π0,η) are equally suppressed due to final-state interactions of the parent partons in the dense medium produced in Au+Au reactions.

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Energy Loss and Flow of Heavy Quarks in Au+Au Collisions at sNN=200 GeV

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Physical review Letters 2007年第17期98卷 172301-172301页

作者： A. Adare S. Afanasiev C. Aidala N. N. Ajitanand Y. Akiba H. Al-Bataineh J. Alexander A. Al-Jamel K. Aoki L. Aphecetche r. Armendariz S. H. Aronson J. Asai E. T. Atomssa r. Averbeck T. C. Awes B. Azmoun V. Babintsev G. Baksay L. Baksay A. Baldisseri K. N. Barish P. d. Barnes B. Bassalleck S. Bathe S. Batsouli V. Baublis F. Bauer A. Bazilevsky S. Belikov r. Bennett Y. Berdnikov A. A. Bickley M. T. Bjorndal J. G. Boissevain H. Borel K. Boyle M. L. Brooks d. S. Brown d. Bucher H. Buesching V. Bumazhnov G. Bunce J. M. Burward-Hoy S. Butsyk S. Campbell J.-S. Chai B. S. Chang J.-L. Charvet S. Chernichenko J. Chiba C. Y. Chi M. Chiu I. J. Choi T. Chujo P. Chung A. Churyn V. Cianciolo C. r. Cleven Y. Cobigo B. A. Cole M. P. Comets P. Constantin M. Csanád T. Csörgő T. dahms K. das G. david M. B. deaton K. dehmelt H. delagrange A. denisov d. d’Enterria A. deshpande E. J. desmond O. dietzsch A. dion M. donadelli J. L. drachenberg O. drapier A. drees A. K. dubey A. durum V. dzhordzhadze Y. V. Efremenko J. Egdemir F. Ellinghaus W. S. Emam A. Enokizono H. En’yo B. Espagnon S. Esumi K. O. Eyser d. E. Fields M. Finger F. Fleuret S. L. Fokin B. Forestier Z. Fraenkel J. E. Frantz A. Franz A. d. Frawley K. Fujiwara Y. Fukao S.-Y. Fung T. Fusayasu S. Gadrat I. Garishvili F. Gastineau M. Germain A. Glenn H. Gong M. Gonin J. Gosset Y. Goto r. Granier de Cassagnac N. Grau S. V. Greene M. Grosse Perdekamp T. Gunji H.-Å. Gustafsson T. Hachiya A. Hadj Henni C. Haegemann J. S. Haggerty M. N. Hagiwara H. Hamagaki r. Han H. Harada E. P. Hartouni K. Haruna M. Harvey E. Haslum K. Hasuko r. Hayano M. Heffner T. K. Hemmick T. Hester J. M. Heuser X. He H. Hiejima J. C. Hill r. Hobbs M. Hohlmann M. Holmes W. Holzmann K. Homma B. Hong T. Horaguchi d. Hornback M. G. Hur T. Ichihara K. Imai M. Inaba Y. Inoue d. Isenhower L. Isenhower M. Ishihara T. Isobe M. Issah A. Isupov B. V. Jacak J. Jia J. Jin O. Jinnouchi B. M. Johnson K. S. Joo d. Jouan F. Kajihara S. Kametani N. Kamihara J. Kamin M. Kaneta J. H. Kang H. Kano H. Kanou T. Kawagishi d. Kawall A. University of Colorado Boulder Colorado 80309 USA Joint Institute for Nuclear Research 141980 Dubna Moscow Region Russia Columbia University New York New York 10027 USA and Nevis Laboratories Irvington New York 10533 USA Chemistry Department Stony Brook University Stony Brook SUNY New York 11794-3400 USA RIKEN The Institute of Physical and Chemical Research Wako Saitama 351-0198 Japan RIKEN BNL Research Center Brookhaven National Laboratory Upton New York 11973-5000 USA New Mexico State University Las Cruces New Mexico 88003 USA Kyoto University Kyoto 606-8502 Japan SUBATECH (Ecole des Mines de Nantes CNRS-IN2P3 Université de Nantes) BP 20722 - 44307 Nantes France Brookhaven National Laboratory Upton New York 11973-5000 USA Laboratoire Leprince-Ringuet Ecole Polytechnique CNRS-IN2P3 Route de Saclay F-91128 Palaiseau France Department of Physics and Astronomy Stony Brook University Stony Brook New York 11794 USA Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA IHEP Protvino State Research Center of Russian Federation Institute for High Energy Physics Protvino 142281 Russia Florida Institute of Technology Melbourne Florida 32901 USA Dapnia CEA Saclay F-91191 Gif-sur-Yvette France University of California Riverside Riverside California 92521 USA Los Alamos National Laboratory Los Alamos New Mexico 87545 USA University of New Mexico Albuquerque New Mexico 87131 USA PNPI Petersburg Nuclear Physics Institute Gatchina Leningrad region 188300 Russia Iowa State University Ames Iowa 50011 USA Saint Petersburg State Polytechnic University St. Petersburg Russia Institut für Kernphysik University of Muenster D-48149 Muenster Germany Cyclotron Application Laboratory KAERI Seoul South Korea Yonsei University IPAP Seoul 120-749 Korea High Energy Accelerator Research Organization KEK Tsukuba Ibaraki 305-0801 Japan University of Illinois at Urbana-Champaign Urbana Illinois 61801 USA Vanderbilt University Nashville Tenness

The PHENIX experiment at the BNL relativistic Heavy Ion Collider (rHIC) has measured electrons with 0.3<pT<9 GeV/c at midrapidity (|y|<0.35) from heavy-flavor (charm and bottom) decays in Au+Au collisions at... 详细信息

The PHENIX experiment at the BNL relativistic Heavy Ion Collider (rHIC) has measured electrons with 0.3drapidity (|y|<0.35) from heavy-flavor (charm and bottom) decays in Au+Au collisions at sNN=200 GeV. The nuclear modification factor rAA relative to p+p collisions shows a strong suppression in central Au+Au collisions, indicating substantial energy loss of heavy quarks in the medium produced at rHIC energies. A large azimuthal anisotropy v2 with respect to the reaction plane is observed for 0.5dicating substantial heavy-flavor elliptic flow. Both rAA and v2 show a pT dependence different from those of neutral pions. A comparison to transport models which simultaneously describe rAA(pT) and v2(pT) suggests that the viscosity to entropy density ratio is close to the conjectured quantum lower bound, i.e., near a perfect fluid.

关键词： Elementary particles

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J/ψ Production versus Transverse Momentum and rapidity in p+p Collisions at s=200 GeV

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Physical review Letters 2007年第23期98卷 232002-232002页

作者： A. Adare S. Afanasiev C. Aidala N. N. Ajitanand Y. Akiba H. Al-Bataineh J. Alexander K. Aoki L. Aphecetche r. Armendariz S. H. Aronson J. Asai E. T. Atomssa r. Averbeck T. C. Awes B. Azmoun V. Babintsev G. Baksay L. Baksay A. Baldisseri K. N. Barish P. d. Barnes B. Bassalleck S. Bathe S. Batsouli V. Baublis A. Bazilevsky S. Belikov r. Bennett Y. Berdnikov A. A. Bickley J. G. Boissevain H. Borel K. Boyle M. L. Brooks H. Buesching V. Bumazhnov G. Bunce S. Butsyk S. Campbell B. S. Chang J.-L. Charvet S. Chernichenko J. Chiba C. Y. Chi M. Chiu I. J. Choi T. Chujo P. Chung A. Churyn V. Cianciolo C. r. Cleven B. A. Cole M. P. Comets P. Constantin M. Csanád T. Csörgő T. dahms K. das G. david M. B. deaton K. dehmelt H. delagrange A. denisov d. d’Enterria A. deshpande E. J. desmond O. dietzsch A. dion M. donadelli O. drapier A. drees A. K. dubey A. durum V. dzhordzhadze Y. V. Efremenko J. Egdemir F. Ellinghaus W. S. Emam A. Enokizono H. En’yo S. Esumi K. O. Eyser d. E. Fields M. Finger M. Finger, Jr. F. Fleuret S. L. Fokin Z. Fraenkel J. E. Frantz A. Franz A. d. Frawley K. Fujiwara Y. Fukao T. Fusayasu S. Gadrat I. Garishvili A. Glenn H. Gong M. Gonin J. Gosset Y. Goto r. Granier de Cassagnac N. Grau S. V. Greene M. Grosse Perdekamp T. Gunji H.-Å. Gustafsson T. Hachiya A. Hadj Henni C. Haegemann J. S. Haggerty H. Hamagaki r. Han H. Harada E. P. Hartouni K. Haruna E. Haslum r. Hayano M. Heffner T. K. Hemmick T. Hester X. He H. Hiejima J. C. Hill r. Hobbs M. Hohlmann W. Holzmann K. Homma B. Hong T. Horaguchi d. Hornback T. Ichihara K. Imai M. Inaba Y. Inoue d. Isenhower L. Isenhower M. Ishihara T. Isobe M. Issah A. Isupov B. V. Jacak J. Jia J. Jin O. Jinnouchi B. M. Johnson K. S. Joo d. Jouan F. Kajihara S. Kametani N. Kamihara J. Kamin M. Kaneta J. H. Kang H. Kanou d. Kawall A. V. Kazantsev A. Khanzadeev J. Kikuchi d. H. Kim d. J. Kim E. Kim E. Kinney A. Kiss E. Kistenev A. Kiyomichi J. Klay C. Klein-Boesing L. Kochenda V. Kochetkov B. Komkov M. Konno d. Kotchetkov A. Kozlov A. Král A. Kravitz J. Kubart G. J. Kunde N. Kuri University of Colorado Boulder Colorado 80309 USA Joint Institute for Nuclear Research 141980 Dubna Moscow Region Russia Columbia University New York New York 10027 USA and Nevis Laboratories Irvington New York 10533 USA Chemistry Department Stony Brook University Stony Brook SUNY New York 11794-3400 USA RIKEN The Institute of Physical and Chemical Research Wako Saitama 351-0198 Japan RIKEN BNL Research Center Brookhaven National Laboratory Upton New York 11973-5000 USA New Mexico State University Las Cruces New Mexico 88003 USA Kyoto University Kyoto 606-8502 Japan SUBATECH (Ecole des Mines de Nantes CNRS-IN2P3 Université de Nantes) BP 20722 44307 Nantes France Brookhaven National Laboratory Upton New York 11973-5000 USA Laboratoire Leprince-Ringuet Ecole Polytechnique CNRS-IN2P3 Route de Saclay F-91128 Palaiseau France Department of Physics and Astronomy Stony Brook University SUNY Stony Brook New York 11794 USA Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA IHEP Protvino State Research Center of Russian Federation Institute for High Energy Physics Protvino 142281 Russia Florida Institute of Technology Melbourne Florida 32901 USA Dapnia CEA Saclay F-91191 Gif-sur-Yvette France University of California–Riverside Riverside California 92521 USA Los Alamos National Laboratory Los Alamos New Mexico 87545 USA University of New Mexico Albuquerque New Mexico 87131 USA PNPI Petersburg Nuclear Physics Institute Gatchina Leningrad region 188300 Russia Saint Petersburg State Polytechnic University St. Petersburg Russia Yonsei University IPAP Seoul 120-749 Korea KEK High Energy Accelerator Research Organization Tsukuba Ibaraki 305-0801 Japan University of Illinois at Urbana-Champaign Urbana Illinois 61801 USA Vanderbilt University Nashville Tennessee 37235 USA Georgia State University Atlanta Georgia 30303 USA IPN-Orsay Universite Paris Sud CNRS-IN2P3 BP 1 F-91406 Orsay France ELTE Eötvös Loránd University H - 11

J/ψ production in p+p collisions at s=200 GeV has been measured by the PHENIX experiment at the BNL relativistic Heavy Ion Collider over a rapidity range of −2.2<y<2.2 and a transverse momentum range of 0<p... 详细信息

J/ψ production in p+p collisions at s=200 GeV has been measured by the PHENIX experiment at the BNL relativistic Heavy Ion Collider over a rapidity range of −2.2d a transverse momentum range of 0resent data set allows a detailed measurement of both the pT and the rapidity distributions and is sufficient to constrain production models. The total cross section times the branching ratio is BllσppJ/ψ=178±3stat±53sys±18norm nb.

关键词： High energy physics

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system Size and Energy dependence of Jet-Induced Hadron Pair Correlation Shapes in Cu+Cu and Au+Au Collisions at sNN=200 and 62.4 GeV

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Physical review Letters 2007年第23期98卷 232302-232302页

作者： A. Adare S. S. Adler S. Afanasiev C. Aidala N. N. Ajitanand Y. Akiba H. Al-Bataineh J. Alexander A. Al-Jamel K. Aoki L. Aphecetche r. Armendariz S. H. Aronson J. Asai E. T. Atomssa r. Averbeck T. C. Awes B. Azmoun V. Babintsev G. Baksay L. Baksay A. Baldisseri K. N. Barish P. d. Barnes B. Bassalleck S. Bathe S. Batsouli V. Baublis F. Bauer A. Bazilevsky S. Belikov r. Bennett Y. Berdnikov A. A. Bickley M. T. Bjorndal J. G. Boissevain H. Borel K. Boyle M. L. Brooks d. S. Brown N. Bruner d. Bucher H. Buesching V. Bumazhnov G. Bunce J. M. Burward-Hoy S. Butsyk X. Camard S. Campbell J.-S. Chai P. Chand B. S. Chang W. C. Chang J.-L. Charvet S. Chernichenko J. Chiba C. Y. Chi M. Chiu I. J. Choi r. K. Choudhury T. Chujo P. Chung A. Churyn V. Cianciolo C. r. Cleven Y. Cobigo B. A. Cole M. P. Comets P. Constantin M. Csanád T. Csörgő J. P. Cussonneau T. dahms K. das G. david F. deák M. B. deaton K. dehmelt H. delagrange A. denisov d. d’Enterria A. deshpande E. J. desmond A. devismes O. dietzsch A. dion M. donadelli J. L. drachenberg O. drapier A. drees A. K. dubey A. durum d. dutta V. dzhordzhadze Y. V. Efremenko J. Egdemir F. Ellinghaus W. S. Emam A. Enokizono H. En’yo B. Espagnon S. Esumi K. O. Eyser d. E. Fields C. Finck M. Finger, Jr. M. Finger F. Fleuret S. L. Fokin B. Forestier B. d. Fox Z. Fraenkel J. E. Frantz A. Franz A. d. Frawley K. Fujiwara Y. Fukao S.-Y. Fung T. Fusayasu S. Gadrat I. Garishvili F. Gastineau M. Germain A. Glenn H. Gong M. Gonin J. Gosset Y. Goto r. Granier de Cassagnac N. Grau S. V. Greene M. Grosse Perdekamp T. Gunji H.-Å. Gustafsson T. Hachiya A. Hadj Henni C. Haegemann J. S. Haggerty M. N. Hagiwara H. Hamagaki r. Han A. G. Hansen H. Harada E. P. Hartouni K. Haruna M. Harvey E. Haslum K. Hasuko r. Hayano M. Heffner T. K. Hemmick T. Hester J. M. Heuser X. He P. Hidas H. Hiejima J. C. Hill r. Hobbs M. Hohlmann M. Holmes W. Holzmann K. Homma B. Hong A. Hoover T. Horaguchi d. Hornback M. G. Hur T. Ichihara V. V. Ikonnikov K. Imai M. Inaba Y. Inoue M. Inuzuka d. Isenhower L. Isenhower M. Ishihara T University of Colorado Boulder Colorado 80309 USA Brookhaven National Laboratory Upton New York 11973-5000 USA Joint Institute for Nuclear Research 141980 Dubna Moscow Region Russia Columbia University New York New York 10027 and Nevis Laboratories Irvington New York 10533 USA Chemistry Department Stony Brook University Stony Brook SUNY New York 11794-3400 USA KEK High Energy Accelerator Research Organization Tsukuba Ibaraki 305-0801 Japan RIKEN The Institute of Physical and Chemical Research Wako Saitama 351-0198 Japan RIKEN BNL Research Center Brookhaven National Laboratory Upton New York 11973-5000 USA New Mexico State University Las Cruces New Mexico 88003 USA Kyoto University Kyoto 606-8502 Japan SUBATECH (Ecole des Mines de Nantes CNRS-IN2P3 Université de Nantes) BP 20722—44307 Nantes France Laboratoire Leprince-Ringuet Ecole Polytechnique CNRS-IN2P3 Route de Saclay F-91128 Palaiseau France Department of Physics and Astronomy Stony Brook University SUNY Stony Brook New York 11794 USA Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA IHEP Protvino State Research Center of Russian Federation Institute for High Energy Physics Protvino 142281 Russia Florida Institute of Technology Melbourne Florida 32901 USA Dapnia CEA Saclay F-91191 Gif-sur-Yvette France University of California—Riverside Riverside California 92521 USA Los Alamos National Laboratory Los Alamos New Mexico 87545 USA University of New Mexico Albuquerque New Mexico 87131 USA Institut für Kernphysik University of Muenster D-48149 Muenster Germany PNPI Petersburg Nuclear Physics Institute Gatchina Leningrad region 188300 Russia Iowa State University Ames Iowa 50011 USA Saint Petersburg State Polytechnic University St. Petersburg Russia Lawrence Livermore National Laboratory Livermore California 94550 USA KAERI Cyclotron Application Laboratory Seoul South Korea Bhabha Atomic Research Centre Bombay 400 085 India Yonsei University IPAP Seoul 120-

We present azimuthal angle correlations of intermediate transverse momentum () hadrons from dijets in and collisions at and 200 GeV. The away-side dijet induced azimuthal correlation is broadened, non-Gaussian, and peaked away from in central and semicentral collisions in all the systems. The broadening and peak location are found to depend upon the number of participants in the collision, but not on the collision energy or beam nuclei. These results are consistent with sound or shock wave models, but pose challenges to Cherenkov gluon radiation models.

关键词： Charged particles

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Scaling Properties of Azimuthal Anisotropy in Au+Au and Cu+Cu Collisions at sNN=200 GeV

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Physical review Letters 2007年第16期98卷 162301-162301页

作者： A. Adare S. Afanasiev C. Aidala N. N. Ajitanand Y. Akiba H. Al-Bataineh J. Alexander A. Al-Jamel K. Aoki L. Aphecetche r. Armendariz S. H. Aronson J. Asai E. T. Atomssa r. Averbeck T. C. Awes B. Azmoun V. Babintsev G. Baksay L. Baksay A. Baldisseri K. N. Barish P. d. Barnes B. Bassalleck S. Bathe S. Batsouli V. Baublis F. Bauer A. Bazilevsky S. Belikov r. Bennett Y. Berdnikov A. A. Bickley M. T. Bjorndal J. G. Boissevain H. Borel K. Boyle M. L. Brooks d. S. Brown d. Bucher H. Buesching V. Bumazhnov G. Bunce J. M. Burward-Hoy S. Butsyk S. Campbell J.-S. Chai B. S. Chang J.-L. Charvet S. Chernichenko J. Chiba C. Y. Chi M. Chiu I. J. Choi T. Chujo P. Chung A. Churyn V. Cianciolo C. r. Cleven Y. Cobigo B. A. Cole M. P. Comets P. Constantin M. Csanád T. Csörgő T. dahms K. das G. david M. B. deaton K. dehmelt H. delagrange A. denisov d. d’Enterria A. deshpande E. J. desmond O. dietzsch A. dion M. donadelli J. L. drachenberg O. drapier A. drees A. K. dubey A. durum V. dzhordzhadze Y. V. Efremenko J. Egdemir F. Ellinghaus W. S. Emam A. Enokizono H. En’yo B. Espagnon S. Esumi K. O. Eyser d. E. Fields M. Finger M. Finger, Jr. F. Fleuret S. L. Fokin B. Forestier Z. Fraenkel J. E. Frantz A. Franz A. d. Frawley K. Fujiwara Y. Fukao S.-Y. Fung T. Fusayasu S. Gadrat I. Garishvili F. Gastineau M. Germain A. Glenn H. Gong M. Gonin J. Gosset Y. Goto r. Granier de Cassagnac N. Grau S. V. Greene M. Grosse Perdekamp T. Gunji H.-Å. Gustafsson T. Hachiya A. Hadj Henni C. Haegemann J. S. Haggerty M. N. Hagiwara H. Hamagaki r. Han H. Harada E. P. Hartouni K. Haruna M. Harvey E. Haslum K. Hasuko r. Hayano M. Heffner T. K. Hemmick T. Hester J. M. Heuser X. He H. Hiejima J. C. Hill r. Hobbs M. Hohlmann M. Holmes W. Holzmann K. Homma B. Hong T. Horaguchi d. Hornback M. G. Hur T. Ichihara K. Imai M. Inaba Y. Inoue d. Isenhower L. Isenhower M. Ishihara T. Isobe M. Issah A. Isupov B. V. Jacak J. Jia J. Jin O. Jinnouchi B. M. Johnson K. S. Joo d. Jouan F. Kajihara S. Kametani N. Kamihara J. Kamin M. Kaneta J. H. Kang H. Kano H. Kanou T. Kawagish University of Colorado Boulder Colorado 80309 USA Joint Institute for Nuclear Research 141980 Dubna Moscow Region Russia Columbia University New York New York 10027 USA and Nevis Laboratories Irvington New York 10533 USA Chemistry Department Stony Brook University SUNY Stony Brook New York 11794-3400 USA RIKEN The Institute of Physical and Chemical Research Wako Saitama 351-0198 Japan RIKEN BNL Research Center Brookhaven National Laboratory Upton New York 11973-5000 USA New Mexico State University Las Cruces New Mexico 88003 USA Kyoto University Kyoto 606-8502 Japan SUBATECH (Ecole des Mines de Nantes CNRS-IN2P3 Université de Nantes) BP 20722–44307 Nantes France Brookhaven National Laboratory Upton New York 11973-5000 USA Laboratoire Leprince-Ringuet Ecole Polytechnique CNRS-IN2P3 Route de Saclay F-91128 Palaiseau France Department of Physics and Astronomy Stony Brook University SUNY Stony Brook New York 11794 USA Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA IHEP Protvino State Research Center of Russian Federation Institute for High Energy Physics Protvino 142281 Russia Florida Institute of Technology Melbourne Florida 32901 USA Dapnia CEA Saclay F-91191 Gif-sur-Yvette France University of California–Riverside Riverside California 92521 USA Los Alamos National Laboratory Los Alamos New Mexico 87545 USA University of New Mexico Albuquerque New Mexico 87131 USA PNPI Petersburg Nuclear Physics Institute Gatchina Leningrad region 188300 Russia Iowa State University Ames Iowa 50011 USA Saint Petersburg State Polytechnic University St. Petersburg Russia Institut für Kernphysik University of Muenster D-48149 Muenster Germany KAERI Cyclotron Application Laboratory Seoul South Korea Yonsei University IPAP Seoul 120-749 Korea KEK High Energy Accelerator Research Organization Tsukuba Ibaraki 305-0801 Japan University of Illinois at Urbana-Champaign Urbana Illinois 61801 USA Vanderbilt University Nashville Ten

differential measurements of elliptic flow (v2) for Au+Au and Cu+Cu collisions at sNN=200 GeV are used to test and validate predictions from perfect fluid hydrodynamics for scaling of v2 with eccentricity, system size, and transverse kinetic energy (KET). For KET≡mT−m up to ∼1 GeV the scaling is compatible with hydrodynamic expansion of a thermalized fluid. For large values of KET mesons and baryons scale separately. Quark number scaling reveals a universal scaling of v2 for both mesons and baryons over the full KET range for Au+Au. For Au+Au and Cu+Cu the scaling is more pronounced in terms of KET, rather than transverse momentum.

关键词： Optical anisotropy

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Production of ω mesons at large transverse momenta in p+p and d+Au collisions at sNN=200 GeV

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Physical review C 2007年第5期75卷 051902(R)-051902(R)页

作者： S. S. Adler S. Afanasiev C. Aidala N. N. Ajitanand Y. Akiba A. Al-Jamel J. Alexander K. Aoki L. Aphecetche r. Armendariz S. H. Aronson r. Averbeck T. C. Awes V. Babintsev A. Baldisseri K. N. Barish P. d. Barnes B. Bassalleck S. Bathe S. Batsouli V. Baublis F. Bauer A. Bazilevsky S. Belikov M. T. Bjorndal J. G. Boissevain H. Borel M. L. Brooks d. S. Brown N. Bruner d. Bucher H. Buesching V. Bumazhnov G. Bunce J. M. Burward-Hoy S. Butsyk X. Camard P. Chand W. C. Chang S. Chernichenko C. Y. Chi J. Chiba M. Chiu I. J. Choi r. K. Choudhury T. Chujo V. Cianciolo Y. Cobigo B. A. Cole M. P. Comets P. Constantin M. Csanád T. Csörgő J. P. Cussonneau d. d'Enterria K. das G. david F. deák H. delagrange A. denisov A. deshpande E. J. desmond A. devismes O. dietzsch J. L. drachenberg O. drapier A. drees A. durum d. dutta V. dzhordzhadze Y. V. Efremenko H. En'yo B. Espagnon S. Esumi d. E. Fields C. Finck F. Fleuret S. L. Fokin B. d. Fox Z. Fraenkel J. E. Frantz A. Franz A. d. Frawley Y. Fukao S.-Y. Fung S. Gadrat M. Germain A. Glenn M. Gonin J. Gosset Y. Goto r. Granier de Cassagnac N. Grau S. V. Greene M. Gross Perdekamp H.-Å. Gustafsson T. Hachiya J. S. Haggerty H. Hamagaki A. G. Hansen E. P. Hartouni M. Harvey K. Hasuko r. Hayano X. He M. Heffner T. K. Hemmick J. M. Heuser P. Hidas H. Hiejima J. C. Hill r. Hobbs W. Holzmann K. Homma B. Hong A. Hoover T. Horaguchi T. Ichihara V. V. Ikonnikov K. Imai M. Inaba M. Inuzuka d. Isenhower L. Isenhower M. Ishihara M. Issah A. Isupov B. V. Jacak J. Jia O. Jinnouchi B. M. Johnson S. C. Johnson K. S. Joo d. Jouan F. Kajihara S. Kametani N. Kamihara M. Kaneta J. H. Kang K. Katou T. Kawabata A. V. Kazantsev S. Kelly B. Khachaturov A. Khanzadeev J. Kikuchi d. J. Kim E. Kim G.-B. Kim H. J. Kim E. Kinney A. Kiss E. Kistenev A. Kiyomichi C. Klein-Boesing H. Kobayashi L. Kochenda V. Kochetkov r. Kohara B. Komkov M. Konno d. Kotchetkov A. Kozlov P. J. Kroon C. H. Kuberg G. J. Kunde K. Kurita M. J. Kweon Y. Kwon G. S. Kyle r. Lacey J. G. Lajoie Y. Le Bornec A. Lebedev S. Leckey d. M. Lee M. J. Le Brookhaven National Laboratory Upton New York 11973-5000 USA Joint Institute for Nuclear Research RU-141980 Dubna Moscow Region Russia Columbia University New York New York 10027 and Nevis Laboratories Irvington New York 10533 USA Chemistry Department Stony Brook University Stony Brook SUNY New York 11794-3400 USA KEK High Energy Accelerator Research Organization Tsukuba Ibaraki 305-0801 Japan RIKEN (The Institute of Physical and Chemical Research) Wako Saitama 351-0198 Japan New Mexico State University Las Cruces New Mexico 88003 USA Kyoto University Kyoto 606-8502 Japan SUBATECH (Ecole des Mines de Nantes CNRS-IN2P3 Université de Nantes) BP 20722-44307 Nantes France Department of Physics and Astronomy Stony Brook University SUNY Stony Brook New York 11794 USA Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA IHEP Protvino State Research Center of Russian Federation Institute for High Energy Physics Protvino RU-142281 Russia Dapnia CEA Saclay F-91191 Gif-sur-Yvette France University of California-Riverside Riverside California 92521 USA Los Alamos National Laboratory Los Alamos New Mexico 87545 USA University of New Mexico Albuquerque New Mexico 87131 USA Institut für Kernphysik University of Muenster D-48149 Muenster Germany PNPI Petersburg Nuclear Physics Institute Gatchina Leningrad region RU-188300 Russia RIKEN BNL Research Center Brookhaven National Laboratory Upton New York 11973-5000 USA Iowa State University Ames Illinois 50011 USA Lawrence Livermore National Laboratory Livermore California 94550 USA Bhabha Atomic Research Centre Bombay 400 085 India Institute of Physics Academia Sinica Taipei 11529 Taiwan Yonsei University IPAP Seoul 120-749 Korea IPN-Orsay Universite Paris Sud CNRS-IN2P3 BP1 F-91406 Orsay France ELTE Eötvös Loránd University H-1117 Budapest Pázmány P. s. 1/A Hungary KFKI Research Institute for Particle and Nuclear Physics of the Hungarian Academy of Sciences (MTA KFKI RMKI) H-1525 B

The PHENIX experiment at rHIC has measured the invariant cross section for ω-meson production at midrapidity in the transverse momentum range 2.5<pT<9.25 GeV/c in p+p and d+Au collisions at sNN=200 GeV. Measure...

The PHENIX experiment at rHIC has measured the invariant cross section for ω-meson production at midrapidity in the transverse momentum range 2.5d d+Au collisions at sNN=200 GeV. Measurements in two decay channels (ω→π0π+π− and ω→π0γ) yield consistent results, and the reconstructed ω mass agrees with the accepted value within the pT range of the measurements. The ω/π0 ratio is found to be 0.85±0.05stat±0.09sys in p+p and 0.94±0.08stat±0.12sys in d+Au collisions, independent of pT. The nuclear modification factor rdAω is 1.03±0.12stat±0.21sys and 0.83±0.21stat±0.17sys in minimum bias and central (0–20%) d+Au collisions, respectively.

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Inclusive cross section and double helicity asymmetry for π0 production in p+p collisions at s=200 GeV: Implications for the polarized gluon distribution in the proton

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Physical review d 2007年第5期76卷 051106(R)-051106(R)页

作者： A. Adare S. Afanasiev C. Aidala N. N. Ajitanand Y. Akiba H. Al-Bataineh J. Alexander K. Aoki L. Aphecetche r. Armendariz S. H. Aronson J. Asai E. T. Atomssa r. Averbeck T. C. Awes B. Azmoun V. Babintsev G. Baksay L. Baksay A. Baldisseri K. N. Barish P. d. Barnes B. Bassalleck S. Bathe S. Batsouli V. Baublis A. Bazilevsky S. Belikov r. Bennett Y. Berdnikov A. A. Bickley J. G. Boissevain H. Borel K. Boyle M. L. Brooks H. Buesching V. Bumazhnov G. Bunce S. Butsyk S. Campbell B. S. Chang J.-L. Charvet S. Chernichenko J. Chiba C. Y. Chi M. Chiu I. J. Choi T. Chujo P. Chung A. Churyn V. Cianciolo C. r. Cleven B. A. Cole M. P. Comets P. Constantin M. Csanád T. Csörgő T. dahms K. das G. david M. B. deaton K. dehmelt H. delagrange A. denisov d. d’Enterria A. deshpande E. J. desmond O. dietzsch A. dion M. donadelli O. drapier A. drees A. K. dubey A. durum V. dzhordzhadze Y. V. Efremenko J. Egdemir F. Ellinghaus W. S. Emam A. Enokizono H. En’yo S. Esumi K. O. Eyser d. E. Fields M. Finger M. Finger, Jr. F. Fleuret S. L. Fokin Z. Fraenkel J. E. Frantz A. Franz A. d. Frawley K. Fujiwara Y. Fukao T. Fusayasu S. Gadrat I. Garishvili A. Glenn H. Gong M. Gonin J. Gosset Y. Goto r. Granier de Cassagnac N. Grau S. V. Greene M. Grosse Perdekamp T. Gunji H.-Å. Gustafsson T. Hachiya A. Hadj Henni C. Haegemann J. S. Haggerty H. Hamagaki r. Han H. Harada E. P. Hartouni K. Haruna E. Haslum r. Hayano M. Heffner T. K. Hemmick T. Hester X. He H. Hiejima J. C. Hill r. Hobbs M. Hohlmann W. Holzmann K. Homma B. Hong T. Horaguchi d. Hornback T. Ichihara K. Imai M. Inaba Y. Inoue d. Isenhower L. Isenhower M. Ishihara T. Isobe M. Issah A. Isupov B. V. Jacak J. Jia J. Jin O. Jinnouchi B. M. Johnson K. S. Joo d. Jouan F. Kajihara S. Kametani N. Kamihara J. Kamin M. Kaneta J. H. Kang H. Kanou d. Kawall A. V. Kazantsev A. Khanzadeev J. Kikuchi d. H. Kim d. J. Kim E. Kim E. Kinney A. Kiss E. Kistenev A. Kiyomichi J. Klay C. Klein-Boesing L. Kochenda V. Kochetkov B. Komkov M. Konno d. Kotchetkov A. Kozlov A. Král A. Kravitz J. Kubart G. J. Kunde N. Kuri University of Colorado Boulder Colorado 80309 USA Joint Institute for Nuclear Research 141980 Dubna Moscow Region Russia Columbia University New York New York 10027 USA and Nevis Laboratories Irvington New York 10533 USA Chemistry Department Stony Brook University SUNY Stony Brook New York 11794-3400 USA RIKEN The Institute of Physical and Chemical Research Wako Saitama 351-0198 Japan RIKEN BNL Research Center Brookhaven National Laboratory Upton New York 11973-5000 USA New Mexico State University Las Cruces New Mexico 88003 USA Kyoto University Kyoto 606-8502 Japan SUBATECH Ecole des Mines de Nantes (CNRS-IN2P3) Université de Nantes BP 20722 - 44307 Nantes France Brookhaven National Laboratory Upton New York 11973-5000 USA Laboratoire Leprince-Ringuet Ecole Polytechnique (CNRS-IN2P3) Route de Saclay F-91128 Palaiseau France Department of Physics and Astronomy Stony Brook University SUNY Stony Brook New York 11794-3800 USA Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA IHEP Protvino State Research Center of Russian Federation Institute for High Energy Physics Protvino 142281 Russia Florida Institute of Technology Melbourne Florida 32901 USA Dapnia CEA Saclay F-91191 Gif-sur-Yvette France University of California Riverside Riverside California 92521 USA Los Alamos National Laboratory Los Alamos New Mexico 87545 USA University of New Mexico Albuquerque New Mexico 87131 USA Petersburg Nuclear Physics Institute (PNPI) Gatchina Leningrad Region 188300 Russia Saint Petersburg State Polytechnic University St. Petersburg Russia Yonsei University IPAP Seoul 120-749 Korea KEK High Energy Accelerator Research Organization Tsukuba Ibaraki 305-0801 Japan University of Illinois at Urbana-Champaign Urbana Illinois 61801 USA Vanderbilt University Nashville Tennessee 37235 USA Georgia State University Atlanta Georgia 30303 USA IPN-Orsay Université Paris Sud (CNRS-IN2P3) BP 1 F-91406 Orsay France ELTE Eötvös Loránd Universi

The PHENIX experiment presents results from the relativistic Heavy Ion Collider 2005 run with polarized proton collisions at s=200 GeV, for inclusive π0 production at midrapidity. Unpolarized cross section results are given for transverse momenta pT=0.5 to 20 GeV/c, extending the range of published data to both lower and higher pT. The cross section is described well for pT<1 GeV/c by an exponential in pT, and, for pT>2 GeV/c, by perturbative QCd. double helicity asymmetries ALL are presented based on a factor of 5 improvement in uncertainties as compared to previously published results, due to both an improved beam polarization of 50%, and to higher integrated luminosity. These measurements are sensitive to the gluon polarization in the proton. Using one representative model of gluon polarization it is demonstrated that the gluon spin contribution to the proton spin is significantly constrained.

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