Inclusive cross section and single transverse spin asymmetry for very forward neutron production in polarized p plus p collisions at √s=200 GeV

被引：21

作者：

Adare, A. ^{[13
]}

Afanasiev, S. ^{[30
]}

Aidala, C. ^{[41
,42
]}

Ajitanand, N. N. ^{[60
]}

Akiba, Y. ^{[54
,55
]}

Al-Bataineh, H. ^{[48
]}

Alexander, J. ^{[60
]}

Aoki, K. ^{[34
,54
]}

Aphecetche, L. ^{[62
]}

Asai, J. ^{[54
]}

Atomssa, E. T. ^{[35
]}

Averbeck, R. ^{[61
]}

Awes, T. C. ^{[50
]}

Azmoun, B. ^{[8
]}

Babintsev, V. ^{[24
]}

Bai, M. ^{[7
]}

Baksay, G. ^{[20
]}

Baksay, L. ^{[20
]}

Baldisseri, A. ^{[17
]}

Barish, K. N. ^{[9
]}

Barnes, P. D. ^{[38
]}

Bassalleck, B. ^{[47
]}

Basye, A. T. ^{[1
]}

Bathe, S. ^{[6
,9
]}

Batsouli, S. ^{[50
]}

Baublis, V. ^{[53
]}

Baumann, C. ^{[43
]}

Bazilevsky, A. ^{[8
]}

Belikov, S. ^{[8
]}

Bennett, R. ^{[61
]}

Berdnikov, A. ^{[57
]}

Berdnikov, Y. ^{[57
]}

Bickley, A. A. ^{[13
]}

Boissevain, J. G. ^{[38
]}

Borel, H. ^{[17
]}

Boyle, K. ^{[61
]}

Brooks, M. L. ^{[38
]}

Buesching, H. ^{[8
]}

Bumazhnov, V. ^{[24
]}

Bunce, G. ^{[8
,55
]}

Butsyk, S. ^{[38
]}

Camacho, C. M. ^{[38
]}

Campbell, S. ^{[61
]}

Chang, B. S. ^{[70
]}

Chang, W. C. ^{[2
]}

Charvet, J. -L. ^{[17
]}

Chernichenko, S. ^{[24
]}

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

Chiu, M. ^{[25
]}

Choi, I. J. ^{[70
]}

机构：

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

[2] Acad Sinica, Inst Phys, Taipei 11529, Taiwan

[3] Augustana Coll, Dept Phys, Sioux Falls, SD 57197 USA

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

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

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

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

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

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

[10] Charles Univ Prague, CR-11636 Prague 1, Czech Republic

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

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

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

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

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

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

[23] Hiroshima Univ, Higashihiroshima 7398526, Japan

[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 Republic, Inst Phys, Prague 18221 8, Czech Republic

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

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

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

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

[32] Korea Univ, Seoul 136701, South Korea

[33] Kurchatov Inst, Russian Res Ctr, Moscow 123098, Russia

[34] Kyoto Univ, Kyoto 6068502, Japan

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

[36] Lahore Univ Management Sci, Dept Phys, Lahore, Pakistan

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

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

[39] Univ Clermont Ferrand, LPC, CNRS IN2P3, F-63177 Aubiere, France

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

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

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

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

[44] Muhlenberg Coll, Allentown, PA 18104 USA

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

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

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

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

[49] Ohio Univ, Dept Phys & Astron, Athens, OH 45701 USA

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

来源：

PHYSICAL REVIEW D | 2013年 / 88卷 / 03期

基金：

美国国家科学基金会; 新加坡国家研究基金会; 以色列科学基金会; 日本学术振兴会;

关键词：

DEEP-INELASTIC SCATTERING; ELASTIC-SCATTERING; NUCLEON SEA; SPECTRA; REGION; ENERGY; HERA; ISR;

D O I：

10.1103/PhysRevD.88.032006

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The energy dependence of the single-transverse-spin asymmetry, A(N), and the cross section for neutron production at very forward angles were measured in the PHENIX experiment at the Relativistic Heavy Ion Collider for polarized p + p collisions at root s = 200 GeV. The neutrons were observed in forward detectors covering an angular range of up to 2.2 mrad. We report results for neutrons with a momentum fraction of x(F) = 0.45 to 1.0. The energy dependence of the measured cross sections were consistent with x(F) scaling, compared to measurements by an experiment at the Intersecting Storage Ring, which measured neutron production in unpolarized p + p collisions at root s = 30.6-62.7 GeV. The cross sections for large x(F) neutron production for p + p collisions, as well as those in e + p collisions measured at the Hadron-Electron Ring Accelerator, are described by a pion exchange mechanism. The observed forward neutron asymmetries were large, reaching A(N) = -0.08 +/- 0.02 for x(F) = 0.8; the measured backward asymmetries, for negative x(F), were consistent with zero. The observed asymmetry for forward neutron production is discussed within the pion exchange framework, with interference between the spin-flip amplitude due to the pion exchange and nonflip amplitudes from all Reggeon exchanges. Within the pion exchange description, the measured neutron asymmetry is sensitive to the contribution of other Reggeon exchanges even for small amplitudes.

引用

页数：17

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