Single-transverse-spin asymmetries of identified charged hadrons in polarized pp collisions at √s=62.4 GeV

The first measurements of x(F)-dependent single- spin asymmetries of identified charged hadrons, pi(+/-), K-+/-, and protons, from transversely polarized proton- proton collisions at 62.4 GeV at RHIC are presented. Large asymmetries are seen in the pion and kaon channels. The asymmetries in inclusive pi(+/-) production, A(N)(pi(+)), increase with x(F) from 0 to similar to 0.25 and A(N)(pi(-)) decrease from 0 to similar to - 0.4. Observed asymmetries for K- unexpectedly show positive values similar to those for K+, increasing with x(F), whereas proton asymmetries are consistent with zero over the measured kinematic range. Comparisons of the data with predictions of QCD- based models are presented.