Probing gluon helicity distribution and quark transversity through hyperon polarization in singly polarized pp collisions

Abstract

We study the polarization of hyperon in different processes in singly polarized $pp$ collisions, in particular its relation to the polarized parton distributions. We show that by measuring hyperon polarization in particularly chosen processes, one can extract useful information on these parton distributions. We show in particular that, by measuring the ${\Sigma }^{+}$ polarization in high $p_T$ direct photon production process, one can extract information on the gluon helicity distribution; and by measuring the transverse polarization of hyeprons with high $p_T$ in singly polarized reactions, one can obtain useful information on the transversity distribution. We present the numerical results obtained for those hyperon polarizations using different models for parton distribution function and those for the spin transfer in fragmentation processes.

25 pages, 8 figures, to appear in Phys. Rev. D

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Cited by in corpus (9)

• Conceptual design of the Spin Physics Detector
• Anti-Lambda polarization in high energy pp collisions with polarized beam
• Transverse spin transfer to $\Lambda$ and $\bar{\Lambda }$ hyperons in polarized proton-proton collisions at $\sqrt{s}=200\mathrm{GeV}$
• Longitudinal polarization of hyperon and anti-hyperon in semi-inclusive deep-inelastic scattering
• Anti-Hyperon polarization in high energy pp collisions with polarized beams
• Longitudinal and transverse spin transfer to $\Lambda$ and $\overline{\Lambda }$ hyperons in polarized $p$+$p$ collisions at $\sqrt{s}=200$ GeV
• Nucleon strangeness polarization from $\Lambda /\bar{\Lambda }$ hyperon production in polarized proton-proton collision at RHIC
• The longitudinal polarization of hyperons in the forward region in polarized $pp$ collisions
• Transverse Spin Transfer of $\Lambda$ and $\overline{\Lambda }$ Hyperons in Polarized $p$+$p$ Collisions at $\sqrt{s}=200$ GeV at RHIC-STAR