/ Experiment-HEP arXiv:1209.3283


Inclusive cross section and single-transverse-spin asymmetry for very forward neutron production in polarized $p+p$ collisions at $\sqrt{s}=200$ GeV


Adare, A. (Colorado U.) ; Afanasiev, S. (Dubna, JINR) ; Aidala, C. (Massachusetts U., Amherst) ; Ajitanand, N.N. (SUNY, Stony Brook) ; Akiba, Y. (Brookhaven) ; Al-Bataineh, H. (New Mexico State U.) ; Alexander, J. (SUNY, Stony Brook) ; Aoki, K. (Nishina Ctr., RIKEN) ; Aphecetche, L. (SUBATECH, Nantes) ; Asai, J. (Nishina Ctr., RIKEN) ; Atomssa, E.T. (Ecole Polytechnique) ; Averbeck, R. (SUNY, Stony Brook) ; Awes, T.C. (Oak Ridge) ; Azmoun, B. (Brookhaven) ; Babintsev, V. (Serpukhov, IHEP) ; Bai, M. (Brookhaven) ; Baksay, G. (Florida Inst. Tech.) ; Baksay, L. (Florida Inst. Tech.) ; Baldisseri, A. (DAPNIA, Saclay) ; Barish, K.N. (UC, Riverside) ; Barnes, P.D. (Los Alamos) ; Bassalleck, B. (New Mexico U.) ; Basye, A.T. (Abilene Christian U.) ; Bathe, S. (UC, Riverside) ; Batsouli, S. (Oak Ridge) ; Baublis, V. (St. Petersburg, INP) ; Baumann, C. (Munster U.) ; Bazilevsky, A. (Brookhaven) ; Belikov, S. (Brookhaven) ; Bennett, R. (SUNY, Stony Brook) ; Berdnikov, A. (St. Petersburg Polytechnic Inst.) ; Berdnikov, Y. (St. Petersburg Polytechnic Inst.) ; Bickley, A.A. (Colorado U.) ; Boissevain, J.G. (Los Alamos) ; Borel, H. (DAPNIA, Saclay) ; Boyle, K. (SUNY, Stony Brook) ; Brooks, M.L. (Los Alamos) ; Buesching, H. (Brookhaven) ; Bumazhnov, V. (Serpukhov, IHEP) ; Bunce, G. (Brookhaven) ; Butsyk, S. (Los Alamos) ; Camacho, C.M. (Los Alamos) ; Campbell, S. (SUNY, Stony Brook) ; Chang, B.S. (Yonsei U.) ; Chang, W.C. (Taiwan, Inst. Phys.) ; Charvet, J.L. (DAPNIA, Saclay) ; Chernichenko, S. (Serpukhov, IHEP) ; Chi, C.Y. (Nevis Labs, Columbia U.) ; Chiu, M. (Illinois U., Urbana) ; Choi, I.J. (Yonsei U.) ; Choudhury, R.K. (Bhabha Atomic Res. Ctr.) ; Chujo, T. (Tsukuba U.) ; Chung, P. (SUNY, Stony Brook) ; Churyn, A. (Serpukhov, IHEP) ; Cianciolo, V. (Oak Ridge) ; Citron, Z. (SUNY, Stony Brook) ; Cole, B.A. (Nevis Labs, Columbia U.) ; Constantin, P. (Los Alamos) ; Csanad, M. (Eotvos U.) ; Csorgo, T. (Budapest, RMKI) ; Dahms, T. (SUNY, Stony Brook) ; Dairaku, S. (Nishina Ctr., RIKEN) ; Das, K. (Florida State U.) ; David, G. (Brookhaven) ; Denisov, A. (Serpukhov, IHEP) ; d'Enterria, D. (Ecole Polytechnique) ; Deshpande, A. (SUNY, Stony Brook) ; Desmond, E.J. (Brookhaven) ; Dietzsch, O. (Sao Paulo U.) ; Dion, A. (SUNY, Stony Brook) ; Donadelli, M. (Sao Paulo U.) ; Drapier, O. (Ecole Polytechnique) ; Drees, A. (SUNY, Stony Brook) ; Drees, K.A. (Brookhaven) ; Dubey, A.K. (Weizmann Inst.) ; Durum, A. (Serpukhov, IHEP) ; Dutta, D. (Bhabha Atomic Res. Ctr.) ; Dzhordzhadze, V. (UC, Riverside) ; Efremenko, Y.V. (Oak Ridge) ; Ellinghaus, F. (Colorado U.) ; Engelmore, T. (Nevis Labs, Columbia U.) ; Enokizono, A. (LLNL, Livermore) ; En'yo, H. (Brookhaven) ; Esumi, S. (Tsukuba U.) ; Eyser, K.O. (UC, Riverside) ; Fadem, B. (Muhlenberg Coll.) ; Fields, D.E. (Brookhaven) ; Finger, M. (Charles U.) ; M.Finger, Jr. (Charles U.) ; Fleuret, F. (Ecole Polytechnique) ; Fokin, S.L. (Kurchatov Inst., Moscow) ; Fraenkel, Z. (Weizmann Inst.) ; Frantz, J.E. (SUNY, Stony Brook) ; Franz, A. (Brookhaven) ; Frawley, A.D. (Florida State U.) ; Fujiwara, K. (Nishina Ctr., RIKEN) ; Fukao, Y. (Nishina Ctr., RIKEN) ; Fusayasu, T. (Nagasaki Inst. Appl. Sci.) ; Garishvili, I. (Tennessee U.) ; Glenn, A. (Colorado U.) ; Gong, H. (SUNY, Stony Brook) ; Gonin, M. (Ecole Polytechnique) ; Gosset, J. (DAPNIA, Saclay) ; Goto, Y. (Brookhaven) ; Granier de Cassagnac, R. (Ecole Polytechnique) ; Grau, N. (Nevis Labs, Columbia U.) ; Greene, S.V. (Vanderbilt U.) ; Grosse Perdekamp, M. (Brookhaven) ; Gunji, T. (Tokyo U.) ; Gustafsson, H.A. (Lund U.) ; Hadj Henni, A. (SUBATECH, Nantes) ; Haggerty, J.S. (Brookhaven) ; Hamagaki, H. (Tokyo U.) ; Han, R. (Peking U.) ; Hartouni, E.P. (LLNL, Livermore) ; Haruna, K. (Hiroshima U.) ; Haslum, E. (Lund U.) ; Hayano, R. (Tokyo U.) ; He, X. (Georgia State U.) ; Heffner, M. (LLNL, Livermore) ; Hemmick, T.K. (SUNY, Stony Brook) ; Hester, T. (UC, Riverside) ; Hill, J.C. (Iowa State U.) ; Hohlmann, M. (Florida Inst. Tech.) ; Holzmann, W. (SUNY, Stony Brook) ; Homma, K. (Hiroshima U.) ; Hong, B. (Korea U.) ; Horaguchi, T. (Tokyo Inst. Tech.) ; Hornback, D. (Tennessee U.) ; Huang, S. (Vanderbilt U.) ; Ichihara, T. (Brookhaven) ; Ichimiya, R. (Nishina Ctr., RIKEN) ; Iinuma, H. (Nishina Ctr., RIKEN) ; Ikeda, Y. (Tsukuba U.) ; Imai, K. (Nishina Ctr., RIKEN) ; Imrek, J. (Debrecen U.) ; Inaba, M. (Tsukuba U.) ; Isenhower, D. (Abilene Christian U.) ; Ishihara, M. (Nishina Ctr., RIKEN) ; Isobe, T. (Nishina Ctr., RIKEN) ; Issah, M. (SUNY, Stony Brook) ; Isupov, A. (Dubna, JINR) ; Ivanischev, D. (St. Petersburg, INP) ; Jacak, B.V. (SUNY, Stony Brook) ; Jia, J. (Nevis Labs, Columbia U.) ; Jin, J. (Nevis Labs, Columbia U.) ; Johnson, B.M. (Brookhaven) ; Joo, K.S. (Myong Ji U.) ; Jouan, D. (Orsay, IPN) ; Kajihara, F. (Tokyo U.) ; Kametani, S. (Nishina Ctr., RIKEN) ; Kamihara, N. (Brookhaven) ; Kamin, J. (SUNY, Stony Brook) ; Kang, J.H. (Yonsei U.) ; Kapustinsky, J. (Los Alamos) ; Kawall, D. (Brookhaven) ; Kazantsev, A.V. (Kurchatov Inst., Moscow) ; Kempel, T. (Iowa State U.) ; Khanzadeev, A. (St. Petersburg, INP) ; Kijima, K.M. (Hiroshima U.) ; Kikuchi, J. (Waseda U.) ; Kim, B.I. (Korea U.) ; Kim, D.H. (Myong Ji U.) ; Kim, D.J. (Yonsei U.) ; Kim, E. (Seoul Natl. U.) ; Kim, S.H. (Yonsei U.) ; Kinney, E. (Colorado U.) ; Kiriluk, K. (Colorado U.) ; Kiss, A. (Eotvos U.) ; Kistenev, E. (Brookhaven) ; Klay, J. (LLNL, Livermore) ; Klein-Boesing, C. (Munster U.) ; Kochenda, L. (St. Petersburg, INP) ; Komkov, B. (St. Petersburg, INP) ; Konno, M. (Tsukuba U.) ; Koster, J. (Illinois U., Urbana) ; Kozlov, A. (Weizmann Inst.) ; Kral, A. (Prague, Tech. U.) ; Kravitz, A. (Nevis Labs, Columbia U.) ; Kunde, G.J. (Los Alamos) ; Kurita, K. (Rikkyo U.) ; Kurosawa, M. (Nishina Ctr., RIKEN) ; Kweon, M.J. (Korea U.) ; Kwon, Y. (Tennessee U.) ; Kyle, G.S. (New Mexico State U.) ; Lacey, R. (SUNY, Stony Brook) ; Lai, Y.S. (Nevis Labs, Columbia U.) ; Lajoie, J.G. (Iowa State U.) ; Layton, D. (Illinois U., Urbana) ; Lebedev, A. (Iowa State U.) ; Lee, D.M. (Los Alamos) ; Lee, K.B. (Korea U.) ; Lee, T. (Seoul Natl. U.) ; Leitch, M.J. (Los Alamos) ; Leite, M.A.L. (Sao Paulo U.) ; Lenzi, B. (Sao Paulo U.) ; Li, X. (Beijing, Inst. Atomic Energy) ; Liebing, P. (Brookhaven) ; Liska, T. (Prague, Tech. U.) ; Litvinenko, A. (Dubna, JINR) ; Liu, H. (New Mexico State U.) ; Liu, M.X. (Los Alamos) ; Love, B. (Vanderbilt U.) ; Lynch, D. (Brookhaven) ; Maguire, C.F. (Vanderbilt U.) ; Makdisi, Y.I. (Brookhaven) ; Malakhov, A. (Dubna, JINR) ; Malik, M.D. (New Mexico U.) ; Manko, V.I. (Kurchatov Inst., Moscow) ; Mannel, E. (Nevis Labs, Columbia U.) ; Mao, Y. (Nishina Ctr., RIKEN) ; Masek, L. (Prague, Inst. Plasma Phys.) ; Masui, H. (Tsukuba U.) ; Matathias, F. (Nevis Labs, Columbia U.) ; McCumber, M. (SUNY, Stony Brook) ; McGaughey, P.L. (Los Alamos) ; Means, N. (SUNY, Stony Brook) ; Meredith, B. (Illinois U., Urbana) ; Miake, Y. (Tsukuba U.) ; Mikes, P. (Prague, Inst. Plasma Phys.) ; Miki, K. (Tsukuba U.) ; Milov, A. (Brookhaven) ; Mishra, M. (Banaras Hindu U.) ; Mitchell, J.T. (Brookhaven) ; Mohanty, A.K. (Bhabha Atomic Res. Ctr.) ; Morino, Y. (Tokyo U.) ; Morreale, A. (UC, Riverside) ; Morrison, D.P. (Brookhaven) ; Moukhanova, T.V. (Kurchatov Inst., Moscow) ; Mukhopadhyay, D. (Vanderbilt U.) ; Murata, J. (Rikkyo U.) ; Nagamiya, S. (KEK, Tsukuba) ; Nagle, J.L. (Colorado U.) ; Naglis, M. (Weizmann Inst.) ; Nagy, M.I. (Eotvos U.) ; Nakagawa, I. (Brookhaven) ; Nakamiya, Y. (Hiroshima U.) ; Nakamura, T. (Hiroshima U.) ; Nakano, K. (Tokyo Inst. Tech.) ; Newby, J. (LLNL, Livermore) ; Nguyen, M. (SUNY, Stony Brook) ; Niita, T. (Tsukuba U.) ; Nouicer, R. (Brookhaven) ; Nyanin, A.S. (Kurchatov Inst., Moscow) ; O'Brien, E. (Brookhaven) ; Oda, S.X. (Tokyo U.) ; Ogilvie, C.A. (Iowa State U.) ; Oka, M. (Tsukuba U.) ; Okada, K. (Brookhaven) ; Onuki, Y. (Nishina Ctr., RIKEN) ; Oskarsson, A. (Lund U.) ; Ouchida, M. (Hiroshima U.) ; Ozawa, K. (Tokyo U.) ; Pak, R. (Brookhaven) ; Palounek, A.P.T. (Los Alamos) ; Pantuev, V. (SUNY, Stony Brook) ; Papavassiliou, V. (New Mexico State U.) ; Park, J. (Seoul Natl. U.) ; Park, W.J. (Korea U.) ; Pate, S.F. (New Mexico State U.) ; Pei, H. (Iowa State U.) ; Peng, J.C. (Illinois U., Urbana) ; Pereira, H. (DAPNIA, Saclay) ; Peresedov, V. (Dubna, JINR) ; Peressounko, D.Yu. (Kurchatov Inst., Moscow) ; Pinkenburg, C. (Brookhaven) ; Purschke, M.L. (Brookhaven) ; Purwar, A.K. (Los Alamos) ; Qu, H. (Georgia State U.) ; Rak, J. (New Mexico U.) ; Rakotozafindrabe, A. (Ecole Polytechnique) ; Ravinovich, I. (Weizmann Inst.) ; Read, K.F. (Tennessee U.) ; Rembeczki, S. (Florida Inst. Tech.) ; Reygers, K. (Munster U.) ; Riabov, V. (St. Petersburg, INP) ; Riabov, Y. (St. Petersburg, INP) ; Roach, D. (Vanderbilt U.) ; Roche, G. (Clermont-Ferrand U.) ; Rolnick, S.D. (UC, Riverside) ; Rosati, M. (Iowa State U.) ; Rosendahl, S.S.E. (Lund U.) ; Rosnet, P. (Clermont-Ferrand U.) ; Rukoyatkin, P. (Dubna, JINR) ; Ruzicka, P. (Prague, Inst. Plasma Phys.) ; Rykov, V.L. (Nishina Ctr., RIKEN) ; Sahlmueller, B. (SUNY, Stony Brook) ; Saito, N. (Brookhaven) ; Sakaguchi, T. (Brookhaven) ; Sakai, S. (Tsukuba U.) ; Sakashita, K. (Tokyo Inst. Tech.) ; Samsonov, V. (St. Petersburg, INP) ; Sato, T. (Tsukuba U.) ; Sawada, S. (KEK, Tsukuba) ; Sedgwick, K. (UC, Riverside) ; Seele, J. (Colorado U.) ; Seidl, R. (Illinois U., Urbana) ; Semenov, A.Yu. (Iowa State U.) ; Semenov, V. (Serpukhov, IHEP) ; Seto, R. (UC, Riverside) ; Sharma, D. (Weizmann Inst.) ; Shein, I. (Serpukhov, IHEP) ; Shibata, T.A. (Tokyo Inst. Tech.) ; Shigaki, K. (Hiroshima U.) ; Shimomura, M. (Tsukuba U.) ; Shoji, K. (Nishina Ctr., RIKEN) ; Shukla, P. (Bhabha Atomic Res. Ctr.) ; Sickles, A. (Brookhaven) ; Silva, C.L. (Sao Paulo U.) ; Silvermyr, D. (Oak Ridge) ; Silvestre, C. (DAPNIA, Saclay) ; Sim, K.S. (Korea U.) ; Singh, B.K. (Banaras Hindu U.) ; Singh, C.P. (Banaras Hindu U.) ; Singh, V. (Banaras Hindu U.) ; Slunecka, M. (Charles U.) ; Soldatov, A. (Serpukhov, IHEP) ; Soltz, R.A. (LLNL, Livermore) ; Sondheim, W.E. (Los Alamos) ; Sorensen, S.P. (Tennessee U.) ; Sourikova, I.V. (Brookhaven) ; Staley, F. (DAPNIA, Saclay) ; Stankus, P.W. (Oak Ridge) ; Stenlund, E. (Lund U.) ; Stepanov, M. (New Mexico State U.) ; Ster, A. (Budapest, RMKI) ; Stoll, S.P. (Brookhaven) ; Sugitate, T. (Hiroshima U.) ; Suire, C. (Orsay, IPN) ; Sukhanov, A. (Brookhaven) ; Sziklai, J. (Budapest, RMKI) ; Takagui, E.M. (Sao Paulo U.) ; Taketani, A. (Brookhaven) ; Tanabe, R. (Tsukuba U.) ; Tanaka, Y. (Nagasaki Inst. Appl. Sci.) ; Tanida, K. (Seoul Natl. U.) ; Tannenbaum, M.J. (Brookhaven) ; Taranenko, A. (SUNY, Stony Brook) ; Tarjan, P. (Debrecen U.) ; Themann, H. (SUNY, Stony Brook) ; Thomas, T.L. (New Mexico U.) ; Togawa, M. (Nishina Ctr., RIKEN) ; Toia, A. (SUNY, Stony Brook) ; Tomasek, L. (Prague, Inst. Plasma Phys.) ; Tomita, Y. (Tsukuba U.) ; Torii, H. (Nishina Ctr., RIKEN) ; Towell, R.S. (Abilene Christian U.) ; Tram, V-N. (Ecole Polytechnique) ; Tserruya, I. (Weizmann Inst.) ; Tsuchimoto, Y. (Hiroshima U.) ; Vale, C. (Iowa State U.) ; Valle, H. (Vanderbilt U.) ; van Hecke, H.W. (Los Alamos) ; Veicht, A. (Illinois U., Urbana) ; Velkovska, J. (Vanderbilt U.) ; Vertesi, R. (Debrecen U.) ; Vinogradov, A.A. (Kurchatov Inst., Moscow) ; Virius, M. (Prague, Tech. U.) ; Vrba, V. (Prague, Inst. Plasma Phys.) ; Vznuzdaev, E. (St. Petersburg, INP) ; Wang, X.R. (New Mexico State U.) ; Watanabe, Y. (Brookhaven) ; Wei, F. (Iowa State U.) ; Wessels, J. (Munster U.) ; White, S.N. (Brookhaven) ; Winter, D. (Nevis Labs, Columbia U.) ; Woody, C.L. (Brookhaven) ; Wysocki, M. (Colorado U.) ; Xie, W. (Brookhaven) ; Yamaguchi, Y.L. (Waseda U.) ; Yamaura, K. (Hiroshima U.) ; Yang, R. (Illinois U., Urbana) ; Yanovich, A. (Serpukhov, IHEP) ; Ying, J. (Georgia State U.) ; Yokkaichi, S. (Brookhaven) ; Young, G.R. (Oak Ridge) ; Younus, I. (New Mexico U.) ; Yushmanov, I.E. (Kurchatov Inst., Moscow) ; Zajc, W.A. (Nevis Labs, Columbia U.) ; Zaudtke, O. (Munster U.) ; Zhang, C. (Oak Ridge) ; Zhou, S. (Beijing, Inst. Atomic Energy) ; Zolin, L. (Dubna, JINR)

Pages: 16

Abstract: 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.

Web-Page: http://inspirehep.net/record/1185577/files/arXiv:1209.3283.pdf; http://inspirehep.net/record/1185577/files/1N62_v2.png; http://inspirehep.net/record/1185577/files/DrawAccPhi_v2.png; http://inspirehep.net/record/1185577/files/DrawCS_all_v2.png; http://inspirehep.net/record/1185577/files/DrawFinAsymPhi_back_v2.png; http://inspirehep.net/record/1185577/files/DrawFinAsymPhi_v2.png; http://inspirehep.net/record/1185577/files/DrawFinAsymXfByPhi_v2.png; http://inspirehep.net/record/1185577/files/DrawPtWithRoughSys_v2.png; http://inspirehep.net/record/1185577/files/DrawR_v2.png; http://inspirehep.net/record/1185577/files/EventStructure_v2.png; http://inspirehep.net/record/1185577/files/NeutronResponceZDC_v2.png; http://inspirehep.net/record/1185577/files/OPE_kinematics.png; http://inspirehep.net/record/1185577/files/OneNeutronPeak_v2.png; http://inspirehep.net/record/1185577/files/PosRes_v2.png; http://inspirehep.net/record/1185577/files/PtShape_v2.png; http://inspirehep.net/record/1185577/files/Unfolding_v2.png; http://inspirehep.net/record/1185577/files/ViewOfForwardDetectors.png; http://inspirehep.net/record/1185577/files/ZDCCenter_v2.png; http://inspirehep.net/record/1185577/files/xposvsCV_v2.png


Note: 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

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