Inclusive cross section and double-helicity asymmetry for π0 production at midrapidity in p plus p collisions at √s=510 GeV

被引：38

作者：

Adare, A. ^{[13
]}

Aidala, C. ^{[40
,44
]}

Ajitanand, N. N. ^{[62
]}

Akiba, Y. ^{[57
,58
]}

Akimoto, R. ^{[12
]}

Alexander, J. ^{[62
]}

Alfred, M. ^{[23
]}

Aoki, K. ^{[33
,57
]}

Apadula, N. ^{[28
,63
]}

Aramaki, Y. ^{[57
]}

Asano, H. ^{[36
,57
]}

Atomssa, E. T. ^{[63
]}

Awes, T. C. ^{[53
]}

Azmoun, B. ^{[7
]}

Babintsev, V. ^{[24
]}

Bai, M. ^{[6
]}

Bai, X. ^{[11
]}

Bandara, N. S. ^{[43
]}

Bannier, B. ^{[63
]}

Barish, K. N. ^{[8
]}

Bathe, S. ^{[5
,58
]}

Baublis, V. ^{[56
]}

Baumann, C. ^{[7
]}

Baumgart, S. ^{[57
]}

Bazilevsky, A. ^{[7
]}

Beaumier, M. ^{[8
]}

Beckman, S. ^{[13
]}

Belmont, R. ^{[13
,44
,67
]}

Berdnikov, A. ^{[60
]}

Berdnikov, Y. ^{[60
]}

Black, D. ^{[8
]}

Blau, D. S. ^{[35
]}

Bok, J. S. ^{[51
]}

Boyle, K. ^{[58
]}

Brooks, M. L. ^{[40
]}

Bryslawskyj, J. ^{[5
]}

Buesching, H. ^{[7
]}

Bumazhnov, V. ^{[24
]}

Butsyk, S. ^{[50
]}

Campbell, S. ^{[14
,15
,28
]}

Chen, C. -H. ^{[58
]}

Chi, C. Y. ^{[14
,15
]}

Chiu, M. ^{[7
]}

Choi, I. J. ^{[25
]}

Choi, J. B. ^{[10
]}

Choi, S. ^{[61
]}

Christiansen, P. ^{[41
]}

Chujo, T. ^{[66
]}

Cianciolo, V. ^{[53
]}

Citron, Z. ^{[68
]}

机构：

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

[2] Augustana Univ, Dept Phys, Sioux Falls, SD 57197 USA

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

[4] Bhabha Atom Res Ctr, Bombay 400085, Maharashtra, India

[5] CUNY, Baruch Coll, New York, NY 10010 USA

[6] Brookhaven Natl Lab, Collider Accelerator Dept, Upton, NY 11973 USA

[7] Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA

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

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

[10] Chonbuk Natl Univ, Jeonju 561756, South Korea

[11] China Inst Atom Energy, Sci & Technol Nucl Data Lab, Beijing 102413, Peoples R China

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

[13] Univ Colorado, Boulder, CO 80309 USA

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

[15] Nevis Labs, Irvington, NY 10533 USA

[16] Czech Tech Univ, Prague 16636 6, Czech Republic

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

[18] Ewha Womans Univ, Seoul 120750, South Korea

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

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

[21] Hanyang Univ, Seoul 133792, South Korea

[22] Hiroshima Univ, Higashihiroshima 7398526, Japan

[23] Howard Univ, Dept Phys & Astron, Washington, DC 20059 USA

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

[25] Univ Illinois, Urbana, IL 61801 USA

[26] Russian Acad Sci, Inst Nucl Res, Moscow 117312, Russia

[27] Acad Sci Czech Republ, Inst Phys, Prague 18221 8, Czech Republic

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

[29] Japan Atom Energy Agcy, Adv Sci Res Ctr, Tokai, Ibaraki 3191195, Japan

[30] Helsinki Inst Phys, FI-40014 Jyvaskyla, Finland

[31] Univ Jyvaskyla, FI-40014 Jyvaskyla, Finland

[32] Karoly Roberts Univ Coll, H-3200 Gyongyos 36, Matraout, Hungary

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

[34] Korea Univ, Seoul 136701, South Korea

[35] Natl Res Ctr Kurchatov Inst, Moscow 123098, Russia

[36] Kyoto Univ, Kyoto 6068502, Japan

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

[38] Lahore Univ Management Sci, Dept Phys, Lahore 54792, Pakistan

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

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

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

[42] Univ Maryland, College Pk, MD 20742 USA

[43] Univ Massachusetts, Dept Phys, Amherst, MA 01003 USA

[44] Univ Michigan, Dept Phys, Ann Arbor, MI 48109 USA

[45] Muhlenberg Coll, Allentown, PA 18104 USA

[46] Myongji Univ, Yongin 449728, Kyonggido, South Korea

[47] Nagasaki Inst Appl Sci, Nagasaki, Nagasaki 8510193, Japan

[48] Nara Womens Univ, Nishi, Nara 6308506, Japan

[49] Natl Res Nucl Univ, Moscow Engn Phys Inst, MEPhI, Moscow 115409, Russia

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

来源：

PHYSICAL REVIEW D | 2016年 / 93卷 / 01期

基金：

以色列科学基金会; 日本学术振兴会; 美国国家科学基金会;

关键词：

DEEP-INELASTIC-SCATTERING; PARTON DISTRIBUTIONS; PROTON;

D O I：

10.1103/PhysRevD.93.011501

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

PHENIX measurements are presented for the cross section and double-helicity asymmetry (A(LL)) in inclusive pi(0) production at midrapidity from p + p collisions at root s = 510 GeV from data taken in 2012 and 2013 at the Relativistic Heavy Ion Collider. The next-to-leading-order perturbative-quantum-chromodynamics theory calculation is in excellent agreement with the presented cross section results. The calculation utilized parton-to-pion fragmentation functions from the recent DSS14 global analysis, which prefer a smaller gluon-to-pion fragmentation function. The pi(0)A(LL) results follow an increasingly positive asymmetry trend with p(T) and root s with respect to the predictions and are in excellent agreement with the latest global analysis results. This analysis incorporated earlier results on pi(0) and jet A(LL) and suggested a positive contribution of gluon polarization to the spin of the proton Delta G for the gluon momentum fraction range x > 0.05. The data presented here extend to a currently unexplored region, down to x similar to 0.01, and thus provide additional constraints on the value of Delta G.

引用

页数：8

共 50 条

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[2] Cross sections and double-helicity asymmetries of midrapidity inclusive charged hadrons in p plus p collisions at √s = 62.4 GeV
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Camacho, C. M.
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Bathe, S.
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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.
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