Transverse single spin asymmetries of forward neutrons in $p+p$ , $p+\mathrm{Al}$ , and $p+\mathrm{Au}$ collisions at $\sqrt{s_{NN}}=200\mathrm{GeV}$ as a function of transverse and longitudinal momenta

Journal Article · Fri Feb 11 00:00:00 EST 2022 · Physical Review D

DOI:https://doi.org/10.1103/PhysRevD.105.032004· OSTI ID:1844796

Acharya, U. A.; Aidala, C.; Akiba, Y.; Alfred, M.; Andrieux, V.; Apadula, N.; Asano, H.; Azmoun, B.; Babintsev, V.; Bandara, N. S.; Barish, K. N.; Bathe, S.; Bazilevsky, A.; Beaumier, M.; Belmont, R.; Berdnikov, A.; Berdnikov, Y.; Bichon, L.; Blankenship, B.; Blau, D. S. ; Bok, J. S.; Borisov, V.; Brooks, M. L.; Bryslawskyj, J.; Bumazhnov, V.; Campbell, S.; Canoa Roman, V.; Cervantes, R.; Chiu, M.; Chi, C. Y.; Choi, I. J.; Choi, J. B.; Citron, Z.; Connors, M.; Corliss, R.; Cronin, N.; Csörgő, T.; Csanád, M.; 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.; Durham, J. M.; Durum, A.; En’yo, H.; Enokizono, A.; Esha, R.; Esumi, S.; Fadem, B.; Fan, W.; Feege, N.; Fields, D. E.; Finger, M.; Finger, M.; Fitzgerald, D.; Fokin, S. L.; Frantz, J. E.; Franz, A.; Frawley, A. D.; Fukuda, Y.; Gallus, P.; Gal, C.; Garg, P.; Ge, H.; Giles, M.; 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.; Hanks, J.; Han, S. Y.; Harvey, M.; Hasegawa, S.; Haseler, T. O. S.; Hemmick, T. K.; He, X.; Hill, J. C.; Hill, K.; Hodges, A.; Hollis, R. S.; Homma, K.; Hong, B.; Hoshino, T.; Hotvedt, N.; Huang, J.; Imai, K.; Inaba, M.; Iordanova, A.; Isenhower, D.; Ivanishchev, D.; Jacak, B. V.; Jezghani, M.; Jiang, X.; Ji, Z.; Johnson, B. M. ; Jouan, D.; Jumper, D. S.; Kang, J. H.; Kapukchyan, D.; Karthas, S.; Kawall, D.; Kazantsev, A. V.; Khachatryan, V.; Khanzadeev, A.; Khatiwada, A.; Kim, C.; Kim, E. -J.; Kim, M.; Kim, T.; Kincses, D.; Kingan, A.; Kistenev, E.; Klatsky, J.; Kline, P.; Koblesky, T.; Kotov, D.; Kovacs, L.; Kudo, S.; Kurita, K.; Kwon, Y.; Lajoie, J. G.; Larionova, D.; Lebedev, A.; Lee, S.; Lee, S. H.; Leitch, M. J.; Leung, Y. H.; Lewis, N. A.; Lim, S. H.; Liu, M. X.; Li, X.; Loggins, V. -R.; Loomis, D. A.; Lovasz, K.; Lynch, D.; Lökös, S.; Majoros, T.; Makdisi, Y. I.; Makek, M.; Manko, V. I.; Mannel, E.; McCumber, M.; McGaughey, P. L.; McGlinchey, D.; McKinney, C.; Mendoza, M.; Mignerey, A. C.; Milov, A.; Mishra, D. K.; Mitchell, J. T.; Mitrankova, M.; Mitrankov, Iu.; Mitsuka, G.; Miyasaka, S.; Mizuno, S.; Mondal, M. M.; Montuenga, P.; Moon, T.; Morrison, D. P.; Mulilo, B.; Murakami, T.; Murata, J.; Nagai, K.; Nagashima, K.; Nagashima, T.; Nagle, J. L.; Nagy, M. I.; Nakagawa, I.; Nakano, K.; Nattrass, C.; Nelson, S.; Niida, T.; Nouicer, R.; Novák, T.; Novitzky, N.; Nukazuka, G.; Nyanin, A. S.; O’Brien, E.; Ogilvie, C. A.; Orjuela Koop, J. D.; Osborn, J. D.; Oskarsson, A.; Ottino, G. J.; Ozawa, K.; Pantuev, V.; Papavassiliou, V.; Park, J. S.; Park, S.; Patel, M.; Pate, S. F.; Peng, W.; Perepelitsa, D. V.; Perera, G. D. N.; Peressounko, D. Yu.; PerezLara, C. E.; Perry, J.; Petti, R.; Phipps, M.; Pinkenburg, C.; Pisani, R. P.; Potekhin, M.; Pun, A.; Purschke, M. L.; Radzevich, P. V.; Ramasubramanian, N.; Read, K. F.; Reynolds, D.; Riabov, V.; Riabov, Y.; Richford, D.; Rinn, T.; Rolnick, S. D.; Rosati, M.; Rowan, Z.; Runchey, J.; Safonov, A. S.; Sakaguchi, T.; Sako, H.; Samsonov, V.; Sarsour, M.; Sato, S.; Schaefer, B.; Schmoll, B. K.; Sedgwick, K.; Seidl, R.; Sen, A.; Seto, R.; Sexton, A.; Sharma, D.; Shein, I.; Shibata, T. -A.; Shigaki, K.; Shimomura, M.; Shioya, T.; Shukla, P.; Sickles, A.; Silva, C. L.; Silvermyr, D.; Singh, B. K.; Singh, C. P.; Singh, V.; Slunečka, M.; Smith, K. L.; Snowball, M.; Soltz, R. A.; Sondheim, W. E.; Sorensen, S. P.; Sourikova, I. V.; Stankus, P. W.; Stoll, S. P.; Sugitate, T.; Sukhanov, A.; Sumita, T.; Sun, J.; Sun, Z.; Sziklai, J.; Tanida, K.; Tannenbaum, M. J.; Tarafdar, S.; Taranenko, A.; Tarnai, G.; Tieulent, R.; Timilsina, A.; Todoroki, T.; Tomášek, M.; Towell, C. L.; Towell, R. S.; Tserruya, I.; Ueda, Y.; Ujvari, B.; van Hecke, H. W.; Velkovska, J.; Virius, M.; Vrba, V.; Vukman, N.; Wang, X. R.; Watanabe, Y. S.; Wong, C. P.; Woody, C. L.; Xue, L.; Xu, C.; Xu, Q.; Yalcin, S.; Yamaguchi, Y. L.; Yamamoto, H.; Yanovich, A.; Yoon, I.; Yoo, J. H.; Yushmanov, I. E.; Yu, H.; Zajc, W. A.; Zelenski, A.; Zharko, S.; Zou, L.

In 2015 the PHENIX collaboration at the Relativistic Heavy Ion Collider recorded p+p, p+Al, and p+Au collision data at center of mass energies of $$\sqrt{s{NN}}$$ = 200 GeV with the proton beam(s) transversely polarized. At very forward rapidities η > 6.8 relative to the polarized proton beam, neutrons were detected either inclusively or in (anti)correlation with detector activity related to hard collisions. The resulting single spin asymmetries, that were previously reported, have now been extracted as a function of the transverse momentum of the neutron as well as its longitudinal momentum fraction x_F. The explicit kinematic dependence, combined with the correlation information allows for a closer look at the interplay of different mechanisms suggested to describe these asymmetries, such as hadronic interactions or electromagnetic interactions in ultra-peripheral collisions, UPC. Events that are correlated with a hard collision indeed display a mostly negative asymmetry that increases in magnitude as a function of transverse momentum with only little dependence on x_F. In contrast, events that are not likely to have emerged from a hard collision display positive asymmetries for the nuclear collisions with a kinematic dependence that resembles that of a UPC based model. Because the UPC interaction depends strongly on the charge of the nucleus, those effects are very small for p+p collisions, moderate for p+Al collisions, and large for p+Au collisions.

• Research Organization: Univ. of Tennessee, Knoxville, TN (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Nuclear Physics (NP)
• Contributing Organization: PHENIX Collaboration
• Grant/Contract Number: FG02-96ER40982
• OSTI ID: 1844796
• Alternate ID(s): OSTI ID: 2007908
• Journal Information: Physical Review D, Journal Name: Physical Review D Vol. 105 Journal Issue: 3; ISSN 2470-0010
• Publisher: American Physical Society
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
Polarization in interactions & scattering
Neutrons
Hadron colliders