Transverse single-spin asymmetry of charged hadrons at forward and backward rapidity in polarized p plus p, p plus Al, and p plus Au collisions at sNN=200 GeV
PHYSICAL REVIEW D(2023)
Abstract
Reported here are transverse single-spin asymmetries (A(N)) in the production of charged hadrons as a function of transverse momentum (p(T)) and Feynman-x (x(F)) in polarized p(up arrow)+ p, p(up arrow) + Al, and p(up arrow) + Au collisions at root s(NN) = 200 GeV. The measurements have been performed at forward and backward rapidity (1.4 < |eta| < 2.4) over the range of 1.5 GeV=c < p(T) < 7.0 GeV/c and 0.04 < |x(F)| < 0.2. A nonzero asymmetry is observed for positively charged hadrons at forward rapidity (x(F) > 0) in p(up arrow) + p collisions, whereas the p(up arrow)+ Al and p. thorn Au results show smaller asymmetries. This finding provides new opportunities to investigate the origin of transverse single-spin asymmetries and a tool to study nuclear effects in p thorn A collisions.
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