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arXiv · 1903.07422

Nuclear dependence of the transverse single-spin asymmetry in the production of charged hadrons at forward rapidity in polarized $p+p$, $p+$Al, and $p+$Au collisions at $\sqrt{s_{_{NN}}}=200$ GeV

C. Aidala·Y. Akiba·M. Alfred·V. Andrieux·N. Apadula·H. Asano·B. Azmoun·V. Babintsev·N. S. Bandara·K. N. Barish·S. Bathe·A. Bazilevsky·M. Beaumier·R. Belmont·A. Berdnikov·Y. Berdnikov·D. S. Blau·J. S. Bok·M. L. Brooks·J. Bryslawskyj·V. Bumazhnov·S. Campbell·V. Canoa Roman·R. Cervantes·C. Y. Chi·M. Chiu·I. J. Choi·J. B. Choi·Z. Citron·M. Connors·N. Cronin·M. Csanád·T. Csörgő·T. W. Danley·M. S. Daugherity·G. David·K. DeBlasio·K. Dehmelt·A. Denisov·A. Deshpande·E. J. Desmond·A. Dion·D. Dixit·J. H. Do·A. Drees·K. A. Drees·J. M. Durham·A. Durum·A. Enokizono·H. En'yo·S. Esumi·B. Fadem·W. Fan·N. Feege·D. E. Fields·M. Finger·M. Finger, Jr.·S. L. Fokin·J. E. Frantz·A. Franz·A. D. Frawley·Y. Fukuda·C. Gal·P. Gallus·E. Gamez·E. A. Gamez·P. Garg·H. Ge·F. Giordano·Y. Goto·N. Grau·S. V. Greene·M. Grosse Perdekamp·T. Gunji·H. Guragain·T. Hachiya·J. S. Haggerty·K. I. Hahn·H. Hamagaki·H. F. Hamilton·S. Y. Han·J. Hanks·S. Hasegawa·T. O. S. Haseler·X. He·T. K. Hemmick·J. C. Hill·K. Hill·A. Hodges·R. S. Hollis·K. Homma·B. Hong·T. Hoshino·N. Hotvedt·J. Huang·S. Huang·K. Imai·M. Inaba·A. Iordanova·D. Isenhower
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Abstract

We report on the nuclear dependence of transverse single-spin asymmetries (TSSAs) in the production of positively-charged hadrons in polarized $p^{\uparrow}+p$, $p^{\uparrow}+$Al and $p^{\uparrow}+$Au collisions at $\sqrt{s_{_{NN}}}=200$ GeV. The measurements have been performed at forward rapidity ($1.4<\eta<2.4$) over the range of $1.8<p_{T}<7.0$ GeV$/c$ and $0.1<x_{F}<0.2$. We observed a positive asymmetry $A_{N}$ for positively-charged hadrons in \polpp collisions, and a significantly reduced asymmetry in $p^{\uparrow}$+$A$ collisions. These results reveal a nuclear dependence of charged hadron $A_N$ in a regime where perturbative techniques are relevant. These results provide new opportunities to use \polpA collisions as a tool to investigate the rich phenomena behind TSSAs in hadronic collisions and to use TSSA as a new handle in studying small-system collisions.

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C. Aidala, Y. Akiba, M. Alfred, V. Andrieux, N. Apadula, H. Asano, B. Azmoun, V. Babintsev, N. S. Bandara, K. N. Barish, S. Bathe, A. Bazilevsky, M. Beaumier, R. Belmont, A. Berdnikov, Y. Berdnikov, D. S. Blau, J. S. Bok, M. L. Brooks, J. Bryslawskyj, V. Bumazhnov, S. Campbell, V. Canoa Roman, R. Cervantes, C. Y. Chi, M. Chiu, I. J. Choi, J. B. Choi, Z. Citron, M. Connors, N. Cronin, M. Csanád, T. Csörgő, T. W. Danley, M. S. Daugherity, G. David, K. DeBlasio, K. Dehmelt, A. Denisov, A. Deshpande, E. J. Desmond, A. Dion, D. Dixit, J. H. Do, A. Drees, K. A. Drees, J. M. Durham, A. Durum, A. Enokizono, H. En'yo, S. Esumi, B. Fadem, W. Fan, N. Feege, D. E. Fields, M. Finger, M. Finger, Jr., S. L. Fokin, J. E. Frantz, A. Franz, A. D. Frawley, Y. Fukuda, C. Gal, P. Gallus, E. Gamez, E. A. Gamez, P. Garg, H. Ge, F. Giordano, Y. Goto, N. Grau, S. V. Greene, M. Grosse Perdekamp, T. Gunji, H. Guragain, T. Hachiya, J. S. Haggerty, K. I. Hahn, H. Hamagaki, H. F. Hamilton, S. Y. Han, J. Hanks, S. Hasegawa, T. O. S. Haseler, X. He, T. K. Hemmick, J. C. Hill, K. Hill, A. Hodges, R. S. Hollis, K. Homma, B. Hong, T. Hoshino, N. Hotvedt, J. Huang, S. Huang, K. Imai, M. Inaba, A. Iordanova, D. Isenhower. 2019-03-18. Nuclear dependence of the transverse single-spin asymmetry in the production of charged hadrons at forward rapidity in polarized $p+p$, $p+$Al, and $p+$Au collisions at $\sqrt{s_{_{NN}}}=200$ GeV. https://doi.org/10.1103/physrevlett.123.122001

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