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

被引：200

作者：

Adare, A. ^{[1
]}

Afanasiev, S.

Aidala, C.

Ajitanand, N. N.

Akiba, Y.

Al-Bataineh, H.

Alexander, J.

Aoki, K.

Aphecetche, L.

Armendariz, R.

Aronson, S. H.

Asai, J.

Atomssa, E. T.

Averbeck, R.

Awes, T. C.

Azmoun, B.

Babintsev, V.

Baksay, G.

Baksay, L.

Baldisseri, A.

Barish, K. N.

Barnes, P. D.

Bassalleck, B.

Bathe, S.

Batsouli, S.

Baublis, V.

Bazilevsky, A.

Belikov, S.

Bennett, R.

Berdnikov, Y.

Bickley, A. A.

Boissevain, J. G.

Borel, H.

Boyle, K.

Brooks, M. L.

Buesching, H.

Bumazhnov, V.

Bunce, G.

Butsyk, S.

Campbell, S.

Chang, B. S.

Charvet, J. -L.

Chernichenko, S.

Chiba, J.

Chi, C. Y.

Chiu, M.

Choi, I. J.

Chujo, T.

Chung, P.

Churyn, A.

机构：

[1] Abilene Christian Univ, Abilene, TX 79699 USA

[2] Banaras Hindu Univ, Dept Phys, Varanasi 221005, Uttar Pradesh, India

[3] Brookhaven Natl Lab, Upton, NY 11973 USA

[4] Univ Calif Riverside, Riverside, CA 92521 USA

[5] Charles Univ Prague, CR-11636 Prague, Czech Republic

[6] CIAE, Beijing, Peoples R China

[7] Univ Tokyo, Grad Sch Sci, Ctr Nucl Study, Bunkyo Ku, Tokyo 1130033, Japan

[8] Univ Colorado, Boulder, CO 80309 USA

[9] Columbia Univ, New York, NY 10027 USA

[10] Nevis Labs, Irvington, NY 10533 USA

[11] Czech Tech Univ, CR-16636 Prague 6, Czech Republic

[12] CEA Saclay, F-91191 Gif Sur Yvette, France

[13] Debrecen Univ, H-4010 Debrecen, Hungary

[14] Eotvos Lorand Univ, ELTE, H-1117 Budapest, Hungary

[15] Florida Inst Technol, Melbourne, FL 32901 USA

[16] Florida State Univ, Tallahassee, FL 32306 USA

[17] Georgia State Univ, Atlanta, GA 30303 USA

[18] Hiroshima Univ, Higashihiroshima 7398526, Japan

[19] Inst High Energy Phys, State Res Ctr Russian Federat, IHEP Protvino, Protvino 142281, Russia

[20] Univ Illinois, Urbana, IL 61801 USA

[21] Acad Sci Czech Republ, Inst Phys, CR-18221 Prague, Czech Republic

[22] Iowa State Univ, Ames, IA 50011 USA

[23] Joint Nucl Res Inst, Dubna 141980, Moscow Region, Russia

[24] High Energy Accelerator Res Org, KEK, Tsukuba, Ibaraki 3050801, Japan

[25] Hungarian Acad Sci, KFKI Res Inst Particle & Nucl Phys, MTA RMKI, H-1525 Budapest, Hungary

[26] Korea Univ, Seoul 136701, South Korea

[27] Russian Res Ctr, Kurchatov Inst, Moscow, Russia

[28] Kyoto Univ, Kyoto 6068502, Japan

[29] Ecole Polytech, Lab Leprince Ringuet, CNRS, IN2P3, F-91128 Palaiseau, France

[30] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA

[31] Los Alamos Natl Lab, Los Alamos, NM 87545 USA

[32] Univ Blaise Pascal, LPC, CNRS, IN2P3, F-63177 Clermont Ferrand, France

[33] Lund Univ, Dept Phys, SE-22100 Lund, Sweden

[34] Univ Munster, Inst Kernphys, D-48149 Munster, Germany

[35] Myongji Univ, Kyonggi Do 449728, South Korea

[36] Nagasaki Inst Appl Sci, Nagasaki Univ, Nagasaki 8510193, Japan

[37] Univ New Mexico, Albuquerque, NM 87131 USA

[38] New Mexico State Univ, Las Cruces, NM 88003 USA

[39] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA

[40] Univ Paris 11, IPN Orsay, CNRS, IN2P3, F-91406 Orsay, France

[41] Peking Univ, Beijing 100871, Peoples R China

[42] PNPI, Gatchina 188300, Leningrad Regio, Russia

[43] RIKEN, Inst Phys & Chem Res, Wako, Saitama 3510198, Japan

[44] Brookhaven Natl Lab, RIKEN, BNL Res Ctr, Upton, NY 11973 USA

[45] Rikkyo Univ, Dept Phys, Toshima Ku, Tokyo 1718501, Japan

[46] St Petersburg State Polytechn Univ, St Petersburg, Russia

[47] Univ Sao Paulo, Inst Fis, BR-05315970 Sao Paulo, Brazil

[48] Seoul Natl Univ, Syst Elect Lab, Seoul 151, South Korea

[49] SUNY Stony Brook, Dept Chem, Stony Brook, NY 11794 USA

[50] SUNY Stony Brook, Dept Phys & Astron, Stony Brook, NY 11794 USA

来源：

PHYSICAL REVIEW D | 2007年 / 76卷 / 05期

关键词：

D O I：

10.1103/PhysRevD.76.051106

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The PHENIX experiment presents results from the Relativistic Heavy Ion Collider 2005 run with polarized proton collisions at root s=200 GeV, for inclusive pi(0) production at midrapidity. Unpolarized cross section results are given for transverse momenta p(T)=0.5 to 20 GeV/c, extending the range of published data to both lower and higher p(T). The cross section is described well for p(T)< 1 GeV/c by an exponential in p(T), and, for p(T)> 2 GeV/c, by perturbative QCD. Double helicity asymmetries A(LL) 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.

引用

页数：7

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