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Aidala, C.; Akiba, Y.; Alfred, M.; Andrieux, V.; Aoki, K.; Apadula, N.; Asano, H.; Ayuso, C.; Azmoun, B.; Babintsev, V.; Bagoly, A.; Bandara, N.S.; Barish, K.N.; Bathe, S.; Bazilevsky, A.; Beaumier, M.; Belmont, R.; Berdnikov, A.; Berdnikov, Y.; Blau, D.S.; Boer, M.; Bok, J.S.; Brooks, M.L.; Bryslawskyj, J.; Bumazhnov, V.; Butler, C.; Campbell, S.; Canoa Roman, V.; Cervantes, R.; Chi, C.Y.; Chiu, M.; Choi, I.J.; Choi, J.B.; Citron, Z.; Connors, M.; Cronin, N.; Csanád, M.; Csörgő, T.; Danley, T.W.; Daugherity, M.S.; David, G.; Deblasio, K.; Dehmelt, K.; Denisov, A.; Deshpande, A.; Desmond, E.J.; Dion, A.; Dixit, D.; Do, J.H.; Drees, A.; Drees, K.A.; Dumancic, M.; Durham, J.M.; Durum, A.; Elder, T.; Enokizono, A.; En'Yo, H.; Esumi, S.; Fadem, B.; Fan, W.; Feege, N.; Fields, D.E.; Finger, M.; Fokin, S.L.; Frantz, J.E.; Franz, A.; Frawley, A.D.; Fukuda, Y.; Gal, C.; Gallus, P.; Garg, P.; Ge, H.; Giordano, F.; Goto, Y.; Grau, N.; Greene, S.V.; Grosse Perdekamp, M.; Gunji, T.; Guragain, H.; Hachiya, T.; Haggerty, J.S.; Hahn, K.I.; Hamagaki, H.; Hamilton, H.F.; Han, S.Y.; Hanks, J.; Hasegawa, S.; Haseler, T.O.S.; He, X.; Hemmick, T.K.; Hill, J.C.; Hill, K.; Hollis, R.S.; Homma, K.; Hong, B.; Hoshino, T.; Hotvedt, N.; Huang, J.; Huang, S.; Imai, K.
Physical review letters, 2018, Letnik: 120, Številka: 2Journal 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.
