Nuclear dependence of transverse-single-spin asymmetries in the production of charged hadrons at forward rapidity in polarized p + p , p + Al, and p + Au collisions at √ s NN = 200 GeV

We report on the nuclear dependence of transverse-single-spin asymmetries (TSSAs) in the production of positively charged hadrons in polarized p ↑ + p , p ↑ +Al and p ↑ +Au collisions at √ s NN = 200 GeV. The measurements have been performed at forward rapidity (1 . 4 < η < 2 . 4) over the range of transverse momentum (1 . 8 < p T < 7 . 0 GeV /c ) and Feynman- x (0 . 1 < x F < 0 . 2). We observed positive asymmetries for positively charged hadrons in p ↑ + p collisions, and significantly reduced asymmetries in p ↑ + A collisions. These results reveal a nuclear dependence of TSSAs for charged-hadron production in a regime where perturbative techniques are applicable. These results provide new opportunities to use p ↑ + A collisions as a tool to investigate the rich phenomena behind TSSAs in hadronic collisions and to use TSSAs as a new handle in studying small-system collisions.

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