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Report No.

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

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 ($$1.4 < eta < 2.4$$) 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 $$p^{uparrow}+p$$ 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 $$p^{uparrow}+$$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.



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Category:Physics, Multidisciplinary



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