Single-Transverse-Spin Asymmetries of Identified Charged Hadrons in Polarized pp Collisions at s=62.4GeV

I. Arsene et al. (BRAHMS Collaboration)
Phys. Rev. Lett. 101, 042001 – Published 22 July 2008

Abstract

The first measurements of xF-dependent single-spin asymmetries of identified charged hadrons, π±, 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 π+ production, AN(π+), increase with xF from 0 to 0.25 and AN(π) decrease from 0 to 0.4. Observed asymmetries for K unexpectedly show positive values similar to those for K+, increasing with xF, whereas proton asymmetries are consistent with zero over the measured kinematic range. Comparisons of the data with predictions of QCD-based models are presented.

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  • Received 7 January 2008

DOI:https://doi.org/10.1103/PhysRevLett.101.042001

©2008 American Physical Society

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Vol. 101, Iss. 4 — 25 July 2008

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