arXiv:0707.0534·v2·High Energy Physics — Phenomenology
Anti-Hyperon polarization in high energy pp collisions with polarized beams
Ye Chen🇨🇳 · Zuo-tang Liang🇨🇳 · Ernst Sichtermann🇺🇸 · Qing-hua Xu🇨🇳 · Shan-shan Zhou🇨🇳
Abstract
We study the longitudinal polarization of the Sigma_bar and Xi_bar anti-hyperons in polarized high energy pp collisions at large transverse momenta, extending a recent study for the Lambda_bar anti-hyperon. We make predictions by using different parametrizations of the polarized parton densities and models for the polarized fragmentation functions. Similar to the Lambda_bar polarization, the Xi_bar0 and Xi_bar+ polarizations are found to be sensitive to the polarized anti-strange sea in the nucleon. The Sigma_bar- and Sigma_bar+ polarizations show sensitivity to the light sea quark polarizations, \Delta \bar u(x) and \Delta \bar d(x), and their asymmetry.
Comments: 17 pages, 9 figures,version to appear in PRD