Longitudinal double-spin asymmetry and cross section for inclusive neutral pion production at midrapidity in polarized proton collisions at s=200 GeV

被引:32
作者
Abelev, B. I. [1 ]
Aggarwal, M. M. [31 ]
Ahammed, Z. [48 ]
Alakhverdyants, A. V. [17 ]
Anderson, B. D. [18 ]
Arkhipkin, D. [4 ]
Averichev, G. S. [17 ]
Balewski, J. [22 ]
Barannikova, O. [1 ]
Barnby, L. S. [3 ]
Baumgart, S. [53 ]
Beavis, D. R. [4 ]
Bellwied, R. [51 ]
Benedosso, F. [27 ,28 ]
Betancourt, M. J. [22 ]
Betts, R. R. [1 ]
Bhasin, A. [16 ]
Bhati, A. K. [31 ]
Bichsel, H. [50 ]
Bielcik, J. [10 ]
Bielcikova, J. [12 ]
Biritz, B. [7 ]
Bland, L. C. [4 ]
Bonner, B. E. [37 ]
Bouchet, J. [18 ]
Braidot, E. [27 ,28 ]
Brandin, A. V. [25 ]
Bridgeman, A. [2 ]
Bruna, E. [53 ]
Bueltmann, S.
Bunzarov, I. [17 ]
Burton, T. P. [3 ]
Cai, X. Z. [41 ]
Caines, H. [53 ]
Sanchez, M. Calderon de la Barca [6 ]
Catu, O. [53 ]
Cebra, D. [6 ]
Cendejas, R. [7 ]
Cervantes, M. C. [43 ]
Chajecki, Z. [29 ,30 ]
Chaloupka, P. [12 ]
Chattopadhyay, S. [48 ]
Chen, H. F. [39 ]
Chen, J. H. [41 ]
Chen, J. Y. [52 ]
Cheng, J. [45 ]
Cherney, M. [9 ]
Chikanian, A. [53 ]
Choi, K. E. [35 ]
Christie, W. [4 ]
机构
[1] Univ Illinois, Chicago, IL 60607 USA
[2] Argonne Natl Lab, Argonne, IL 60439 USA
[3] Univ Birmingham, Birmingham, W Midlands, England
[4] Brookhaven Natl Lab, Upton, NY 11973 USA
[5] Univ Calif Berkeley, Berkeley, CA 94720 USA
[6] Univ Calif Davis, Davis, CA 95616 USA
[7] Univ Calif Los Angeles, Los Angeles, CA 90095 USA
[8] Univ Estadual Campinas, Sao Paulo, Brazil
[9] Creighton Univ, Omaha, NE 68178 USA
[10] Czech Tech Univ, FNSPE, Prague 11519, Czech Republic
[11] Goethe Univ Frankfurt, Frankfurt, Germany
[12] Nucl Phys Inst AS CR, Prague 25068, Czech Republic
[13] Inst Phys, Bhubaneswar 751005, Orissa, India
[14] Indian Inst Technol, Mumbai 400076, Maharashtra, India
[15] Indiana Univ, Bloomington, IN 47408 USA
[16] Univ Jammu, Jammu 180001, India
[17] Joint Inst Nucl Res, Dubna 141980, Russia
[18] Kent State Univ, Kent, OH 44242 USA
[19] Univ Kentucky, Lexington, KY 40506 USA
[20] Inst Modern Phys, Lanzhou, Peoples R China
[21] Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA
[22] MIT, Cambridge, MA 02139 USA
[23] Max Planck Inst Phys & Astrophys, D-80805 Munich, Germany
[24] Michigan State Univ, E Lansing, MI 48824 USA
[25] Moscow Engn Phys Inst, Moscow 115409, Russia
[26] CUNY City Coll, New York, NY 10031 USA
[27] NIKHEF H, NL-1009 DB Amsterdam, Netherlands
[28] Univ Utrecht, Amsterdam, Netherlands
[29] Ohio State Univ, Columbus, OH 43210 USA
[30] Old Dominion Univ, Norfolk, VA 23529 USA
[31] Panjab Univ, Chandigarh 160014, India
[32] Penn State Univ, University Pk, PA 16802 USA
[33] Inst High Energy Phys, Protvino, Russia
[34] Purdue Univ, W Lafayette, IN 47907 USA
[35] Pusan Natl Univ, Pusan 609735, South Korea
[36] Univ Rajasthan, Jaipur 302004, Rajasthan, India
[37] Rice Univ, Houston, TX 77251 USA
[38] Univ Sao Paulo, Sao Paulo, Brazil
[39] Univ Sci & Technol China, Hefei 230026, Peoples R China
[40] Shandong Univ, Jinan 250100, Shandong, Peoples R China
[41] Shanghai Inst Appl Phys, Shanghai 201800, Peoples R China
[42] SUBATECH, Nantes, France
[43] Texas A&M Univ, College Stn, TX 77843 USA
[44] Univ Texas Austin, Austin, TX 78712 USA
[45] Tsinghua Univ, Beijing 100084, Peoples R China
[46] US Naval Acad, Annapolis, MD 21402 USA
[47] Valparaiso Univ, Valparaiso, IN 46383 USA
[48] Ctr Variable Energy Cyclotron, Kolkata 700064, India
[49] Warsaw Univ Technol, Warsaw, Poland
[50] Univ Washington, Seattle, WA 98195 USA
来源
PHYSICAL REVIEW D | 2009年 / 80卷 / 11期
基金
巴西圣保罗研究基金会; 英国工程与自然科学研究理事会; 美国国家科学基金会;
关键词
PARTON DISTRIBUTIONS; PHOTOPRODUCTION; MOMENTUM; JET;
D O I
10.1103/PhysRevD.80.111108
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We report a measurement of the longitudinal double-spin asymmetry A(LL) and the differential cross section for inclusive pi(0) production at midrapidity in polarized proton collisions at s=200 GeV. The cross section was measured over a transverse momentum range of 1 < p(T)< 17 GeV/c and found to be in good agreement with a next-to-leading order perturbative QCD calculation. The longitudinal double-spin asymmetry was measured in the range of 3.7 < p(T)< 11 GeV/c and excludes a maximal positive gluon polarization in the proton. The mean transverse momentum fraction of pi(0)'s in their parent jets was found to be around 0.7 for electromagnetically triggered events.
引用
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页数:7
相关论文
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