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

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Title:	Inclusive cross section and single transverse spin asymmetry for very forward neutron production in polarized p+p collisions at √s=200 GeV
Authors:	彭仁傑;Al-Bataineh, H.;Aoki, K.;Asai, J.;Baldisseri, A.;Barish, K. N.;Batsouli, S.;Baumann, C.;Bazilevsky, A.;Berdnikov, A.;Bickley, A. A.;Borel, H.;Boyle, K.;Buesching, H.;Bumazhnov, V.;Chernichenko, S.;Chiu, M.;Chung, P.;Constantin, P.;Csanád, M.;Csörgő, T.;David, G.;Denisov, A.;d’Enterria, D.;Dion, A.;Donadelli, M.;Drapier, O.;Drees, K. A.;En’yo, H.;Eyser, K. O.;Fadem, B.;Fields, D. E.;Finger, M.;Fleuret, F.;Fujiwara, K.;Gosset, J.;Grau, N.;Greene, S. V.;Gunji, T.;Homma, K.;Horaguchi, T.;Ichimiya, R.;Iinuma, H.;Inaba, M.;Ishihara, M.;Isobe, T.;Issah, M.;Ivanischev, D.;Jacak, B. V.;Kamihara, N.;Kapustinsky, J.;Kempel, T.;Kim, D. J.;Kim, E.;Kim, S. H.;Kurita, K.;Lacey, R.;Lai, Y. S.;Lee, K. B.;Leitch, M. J.;Lynch, D.;Makdisi, Y. I.;Masui, H.;Meredith, B.;Nakamura, T.;Nouicer, R.;Oka, M.;Okada, K.;Oskarsson, A.;Park, W. J.;Pate, S. F.;Peresedov, V.;Purwar, A. K.;Riabov, V.;Rolnick, S. D.;Rukoyatkin, P.;Sato, T.;Semenov, A. Yu.;Semenov, V.;Seto, R.;Shibata, T.-A.;Shimomura, M.;Shoji, K.;Soldatov, A.;Sondheim, W. E.;Sorensen, S. P.;Stepanov, M.;Sukhanov, A.;Takagui, E. M.;Tannenbaum, M. J.;Tarján, P.;Torii, H.;Towell, R. S.;Tsuchimoto, Y.;Vrba, V.;Wang, X. R.;Watanabe, Y.;Xie, W.;Ying, J.;Yushmanov, I. E.;Zaudtke, O.
Contributors:	高能與強場物理研究中心
Keywords:	[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex];[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex];FOS: Physical sciences;High Energy Physics - Experiment;High Energy Physics - Experiment (hep-ex);Nuclear Experiment;Nuclear Experiment (nucl-ex)
Date:	2013-08-08
Issue Date:	2026-04-23 12:02:43 (UTC+8)
Publisher:	American Physical Society;American Physical Society (APS)
Abstract:	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 RHIC for polarized p+p collisions at sqrt(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 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 ISR experiment which measured neutron production in unpolarized p+p collisions at sqrt(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 HERA, 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. 383 authors, 16 pages, 18 figures, 6 tables. Submitted to Phys. Rev. D. Plain text data tables for the points plotted in figures for this and previous PHENIX publications are (or will be) publicly available at http://www.phenix.bnl.gov/papers.html 出版者： American Physical Society (APS) 出版日期： 2013-08-08 出處： Physical Review D, 2013-08, Vol.88 (3) 識別號： ISSN: 1550-7998 識別號： DOI: 10.48550/arxiv.1209.3283 識別號： DOI: 10.1103/physrevd.88.032006
Appears in Collections:	[Center for High Energy and High Field Physics (CHiP)] journal & Dissertation

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