Production asymmetry measurement of high xT hadrons in p ↑ p collisions at 40 GeV

Abstract Single-spin asymmetries for hadrons have been measured in collisions of a transversely polarized 40 GeV / c proton beam with an unpolarized liquid hydrogen target. The asymmetries were measured for π ± , K ± , protons and antiprotons, produced in the central region (0.02 ⩽ x F ⩽ 0.10 and 0.7 ⩽ p T ⩽ 3.4 GeV / c ). Asymmetries for π ± , K ± and p show, within measurement errors, a linear dependence on x T and change sign near 0.37. For protons, a negative asymmetry, independent of x T , has been found. The results are compared with those of other experiments and SU(6) model predictions.