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

Aidala, C.*; Hasegawa, Shoichi ; Imai, Kenichi; Sako, Hiroyuki ; Sato, Susumu ; Tanida, Kiyoshi ; PHENIX Collaboration*; 296 of others*

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 () over the range of $1.8 < p_{T} < 7.0$ GeV and $0.1 < x_{F} < 0.2$ . We observed a positive asymmetry $A_{N}$ for positively-charged hadrons in $p^{uparrow}+p$ collisions, and a significantly reduced asymmetry in $p^{uparrow}$ + collisions. These results reveal a nuclear dependence of charged hadron in a regime where perturbative techniques are relevant. These results provide new opportunities to use $p^{uparrow}+$ A 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.

Language	:	English
Journal	:	Physical Review Letters
Volume	:	123
Number	:	12
Pages	:	p.122001_1 - 122001_9
Publication Year/Month	:	2019/09
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Paper URL	:	https://doi.org/10.1103/PhysRevLett.123.122001
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Cooperating Institute	:	Brookhaven National Laboratory

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Registration No. : AA20190572
JAEA Abstracts No. : 48000257
Paper Submission No. : 22597

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Nuclear dependence of the transverse single-spin asymmetry in the production of charged hadrons at forward rapidity in polarized , Al, and Au collisions at GeV

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