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

  • A. Adare
  • , S. Afanasiev
  • , C. Aidala
  • , N. N. Ajitanand
  • , Y. Akiba
  • , H. Al-Bataineh
  • , J. Alexander
  • , K. Aoki
  • , L. Aphecetche
  • , J. Asai
  • , E. T. Atomssa
  • , R. Averbeck
  • , T. C. Awes
  • , B. Azmoun
  • , V. Babintsev
  • , M. Bai
  • , G. Baksay
  • , L. Baksay
  • , A. Baldisseri
  • , K. N. Barish
  • P. D. Barnes, B. Bassalleck, A. T. Basye, S. Bathe, S. Batsouli, V. Baublis, C. Baumann, A. Bazilevsky, S. Belikov, R. Bennett, A. Berdnikov, Y. Berdnikov, A. A. Bickley, J. G. Boissevain, H. Borel, K. Boyle, M. L. Brooks, H. Buesching, V. Bumazhnov, G. Bunce, S. Butsyk, C. M. Camacho, S. Campbell, B. S. Chang, W. C. Chang, J. L. Charvet, S. Chernichenko, C. Y. Chi, M. Chiu, I. J. Choi, R. K. Choudhury, T. Chujo, P. Chung, A. Churyn, V. Cianciolo, Z. Citron, B. A. Cole, P. Constantin, M. Csanád, T. Csörgo, T. Dahms, S. Dairaku, K. Das, G. David, A. Denisov, D. D'Enterria, A. Deshpande, E. J. Desmond, O. Dietzsch, A. Dion, M. Donadelli, O. Drapier, A. Drees, K. A. Drees, A. K. Dubey, A. Durum, D. Dutta, V. Dzhordzhadze, Y. V. Efremenko, F. Ellinghaus, T. Engelmore, A. Enokizono, H. En'Yo, S. Esumi, K. O. Eyser, B. Fadem, D. E. Fields, M. Finger, M. Finger, F. Fleuret, S. L. Fokin, Z. Fraenkel, J. E. Frantz, A. Franz, A. D. Frawley, K. Fujiwara, Y. Fukao, T. Fusayasu, I. Garishvili, A. Glenn, H. Gong, M. Gonin, J. Gosset, Y. Goto, R. Granier De Cassagnac, N. Grau, S. V. Greene, M. Grosse Perdekamp, T. Gunji, H. Å Gustafsson, A. Hadj Henni, J. S. Haggerty, H. Hamagaki, R. Han, E. P. Hartouni, K. Haruna, E. Haslum, R. Hayano, X. He, M. Heffner, T. K. Hemmick, T. Hester, J. C. Hill, M. Hohlmann, W. Holzmann, K. Homma, B. Hong, T. Horaguchi, D. Hornback, S. Huang, T. Ichihara, R. Ichimiya, H. Iinuma, Y. Ikeda, K. Imai, J. Imrek, M. Inaba, D. Isenhower, M. Ishihara, T. Isobe, M. Issah, A. Isupov, D. Ivanischev, B. V. Jacak, J. Jia, J. Jin, B. M. Johnson, K. S. Joo, D. Jouan, F. Kajihara, S. Kametani, N. Kamihara, J. Kamin, J. H. Kang, J. Kapustinsky, D. Kawall, A. V. Kazantsev, T. Kempel, A. Khanzadeev, K. M. Kijima, J. Kikuchi, B. I. Kim, D. H. Kim, D. J. Kim, E. Kim, S. H. Kim, E. Kinney, K. Kiriluk, Á Kiss, E. Kistenev, J. Klay, C. Klein-Boesing, L. Kochenda, B. Komkov, M. Konno, J. Koster, A. Kozlov, A. Král, A. Kravitz, G. J. Kunde, K. Kurita, M. Kurosawa, M. J. Kweon, Y. Kwon, G. S. Kyle, R. Lacey, Y. S. Lai, J. G. Lajoie, D. Layton, A. Lebedev, D. M. Lee, K. B. Lee, T. Lee, M. J. Leitch, M. A.L. Leite, B. Lenzi, X. Li, P. Liebing, T. Liška, A. Litvinenko, H. Liu, M. X. Liu, B. Love, D. Lynch, C. F. Maguire, Y. I. Makdisi, A. Malakhov, M. D. Malik, V. I. Manko, E. Mannel, Y. Mao, L. Mašek, H. Masui, F. Matathias, M. McCumber, P. L. McGaughey, N. Means, B. Meredith, Y. Miake, P. Mikeš, K. Miki, A. Milov, M. Mishra, J. T. Mitchell, A. K. Mohanty, Y. Morino, A. Morreale, D. P. Morrison, T. V. Moukhanova, D. Mukhopadhyay, J. Murata, S. Nagamiya, J. L. Nagle, M. Naglis, M. I. Nagy, I. Nakagawa, Y. Nakamiya, T. Nakamura, K. Nakano, J. Newby, M. Nguyen, T. Niida, R. Nouicer, A. S. Nyanin, E. O'Brien, S. X. Oda, C. A. Ogilvie, M. Oka, K. Okada, Y. Onuki, A. Oskarsson, M. Ouchida, K. Ozawa, R. Pak, A. P.T. Palounek, V. Pantuev, V. Papavassiliou, J. Park, W. J. Park, S. F. Pate, H. Pei, J. C. Peng, H. Pereira, V. Peresedov, D. Yu Peressounko, C. Pinkenburg, M. L. Purschke, A. K. Purwar, H. Qu, J. Rak, A. Rakotozafindrabe, I. Ravinovich, K. F. Read, S. Rembeczki, K. Reygers, V. Riabov, Y. Riabov, D. Roach, G. Roche, S. D. Rolnick, M. Rosati, S. S.E. Rosendahl, P. Rosnet, P. Rukoyatkin, P. Ružička, V. L. Rykov, B. Sahlmueller, N. Saito, T. Sakaguchi, S. Sakai, K. Sakashita, V. Samsonov, T. Sato, S. Sawada, K. Sedgwick, J. Seele, R. Seidl, A. Yu Semenov, V. Semenov, R. Seto, D. Sharma, I. Shein, T. A. Shibata, K. Shigaki, M. Shimomura, K. Shoji, P. Shukla, A. Sickles, C. L. Silva, D. Silvermyr, C. Silvestre, K. S. Sim, B. K. Singh, C. P. Singh, V. Singh, M. Slunečka, A. Soldatov, R. A. Soltz, W. E. Sondheim, S. P. Sorensen, I. V. Sourikova, F. Staley, P. W. Stankus, E. Stenlund, M. Stepanov, A. Ster, S. P. Stoll, T. Sugitate, C. Suire, A. Sukhanov, J. Sziklai, E. M. Takagui, A. Taketani, R. Tanabe, Y. Tanaka, K. Tanida, M. J. Tannenbaum, A. Taranenko, P. Tarján, H. Themann, T. L. Thomas, M. Togawa, A. Toia, L. Tomášek, Y. Tomita, H. Torii, R. S. Towell, V. N. Tram, I. Tserruya, Y. Tsuchimoto, C. Vale, H. Valle, H. W. Van Hecke, A. Veicht, J. Velkovska, R. Vértesi, A. A. Vinogradov, M. Virius, V. Vrba, E. Vznuzdaev, X. R. Wang, Y. Watanabe, F. Wei, J. Wessels, S. N. White, D. Winter, C. L. Woody, M. Wysocki, W. Xie, Y. L. Yamaguchi, K. Yamaura, R. Yang, A. Yanovich, J. Ying, S. Yokkaichi, G. R. Young, I. Younus, I. E. Yushmanov, W. A. Zajc, O. Zaudtke, C. Zhang, S. Zhou, L. Zolin
  • University of Colorado Boulder
  • Columbia University
  • Joint Institute for Nuclear Research
  • University of Massachusetts
  • University of Michigan, Ann Arbor
  • Stony Brook University
  • RIKEN
  • Brookhaven National Lab
  • New Mexico State University
  • Kyoto University
  • Nantes Université
  • CNRS-IN2P3
  • Oak Ridge National Laboratory
  • Brookhaven National Laboratory
  • Institute for High Energy Physics
  • Florida Institute of Technology
  • CEA Saclay
  • University of California at Riverside
  • Los Alamos National Laboratory
  • University of New Mexico
  • Abilene Christian University
  • City University of New York
  • Petersburg Nuclear Physics InstituteGatchina
  • University of Münster
  • Peter the Great St. Petersburg Polytechnic University
  • Yonsei University
  • Academia Sinica - Institute of Physics
  • University of Illinois at Urbana-Champaign
  • Homi Bhabha National Institute
  • University of Tsukuba
  • Eötvös Loránd University
  • Hungarian Academy of Sciences
  • Florida State University
  • Universidade de São Paulo
  • Weizmann Institute of Science
  • Lawrence Livermore National Laboratory
  • Muhlenberg College
  • Charles University
  • Russian Research Centre Kurchatov Institute
  • Ohio University
  • Nagasaki Institute of Applied Science
  • University of Tennessee
  • Augustana College, Sioux Falls
  • Vanderbilt University
  • The University of Tokyo
  • Lund University
  • Peking University
  • Hiroshima University
  • Georgia State University
  • Iowa State University
  • Korea University
  • Institute of Science Tokyo
  • Japan Atomic Energy Agency
  • University of Debrecen
  • Myongji University
  • Université Paris-Saclay
  • Waseda University
  • Seoul National University
  • Czech Technical University in Prague
  • Rikkyo University
  • China National Nuclear Corporation
  • Czech Academy of Sciences
  • Banaras Hindu University
  • High Energy Accelerator Research Organization, Tsukuba
  • Institute for Nuclear Research of the Russian Academy of Sciences
  • Université Blaise Pascal
  • Lahore University of Management Sciences

Research output: Contribution to journalArticlepeer-review

36 Scopus citations

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 the Relativistic Heavy Ion Collider for polarized p+p collisions at √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 xF=0.45 to 1.0. The energy dependence of the measured cross sections were consistent with xF scaling, compared to measurements by an experiment at the Intersecting Storage Ring, which measured neutron production in unpolarized p+p collisions at √s=30.6-62.7 GeV. The cross sections for large xF 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 AN=-0.08±0.02 for xF=0.8; the measured backward asymmetries, for negative xF, 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.

Original languageEnglish
Article number032006
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume88
Issue number3
DOIs
StatePublished - Aug 8 2013

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