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  • Nuclear Dependence of the Transverse-Single-Spin Asymmetry for Forward Neutron Production in Polarized p+A Collisions at sqrt[s_{NN}]=200  GeV
    Alfred, M; Aoki, K; Apadula, N; Azmoun, B; Bagoly, A; Bandara, N S; Barish, K N; Bathe, S; Bazilevsky, A; Beaumier, M; Belmont, R; Blau, D S; Butler, C; Chi, C Y; Chiu, M; Choi, J B; Connors, M; Daugherity, M S; Deshpande, A; Desmond, E J; Durham, J M; En'yo, H; Esumi, S; Fadem, B; Fukuda, Y; Garg, P; Giordano, F; Goto, Y; Haggerty, J S; Haseler, T O S; He, X; Hollis, R S; Huang, J; Isenhower, D; Jacak, B V; Karthas, S; Kawall, D; Kazantsev, A V; Kim, E-J; Kistenev, E; Klatsky, J; Koblesky, T; Kurita, K; Leitch, M J; Liu, L D; Lynch, D; Makek, M; Masuda, H; McCumber, M; McKinney, C; Mendoza, M; Mishra, D K; Mitchell, J T; Mitsuka, G; Miyasaka, S; Mizuno, S; Montuenga, P; Morrow, S I M; Murakami, T; Nagashima, T; Nagle, J L; Nakano, K; Nattrass, C; Niida, T; Nyanin, A S; Oskarsson, A; Pate, S F; Patel, M; Perera, G D N; Pinkenburg, C; Read, K F; Riabov, Y; Rolnick, S D; Schaefer, B; Sedgwick, K; Seidl, R; Seto, R; Shein, I; Shibata, T-A; Shukla, P; Singh, B K; Singh, V; Smith, K L; Tanida, K; Tarafdar, S; Taranenko, A; Tarnai, G; Towell, C L; Tserruya, I; Ueda, Y; Virius, M; Vrba, V; Vukman, N; Wang, Z; Wong, C P; Xu, C; Xue, L; Yalcin, S; Yamaguchi, Y L; Yanovich, A

    Physical review letters, 2018-Jan-12, 20180112, Letnik: 120, Številka: 2
    Journal Article

    During 2015, the Relativistic Heavy Ion Collider (RHIC) provided collisions of transversely polarized protons with Au and Al nuclei for the first time, enabling the exploration of transverse-single-spin asymmetries with heavy nuclei. Large single-spin asymmetries in very forward neutron production have been previously observed in transversely polarized p+p collisions at RHIC, and the existing theoretical framework that was successful in describing the single-spin asymmetry in p+p collisions predicts only a moderate atomic-mass-number (A) dependence. In contrast, the asymmetries observed at RHIC in p+A collisions showed a surprisingly strong A dependence in inclusive forward neutron production. The observed asymmetry in p+Al collisions is much smaller, while the asymmetry in p+Au collisions is a factor of 3 larger in absolute value and of opposite sign. The interplay of different neutron production mechanisms is discussed as a possible explanation of the observed A dependence.

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