Lambda Polarization in Polarized Proton-Proton Collisions at RHIC

Abstract

We discuss Lambda polarization in semi-inclusive proton-proton collisions, with one of the protons longitudinally polarized. The hyperfine interaction responsible for the $\Delta$-$N$ and $\Sigma$-$\Lambda$ mass splittings gives rise to flavor asymmetric fragmentation functions and to sizable polarized non-strange fragmentation functions. We predict large positive Lambda polarization in polarized proton-proton collisions at large rapidities of the produced Lambda, while other models, based on SU(3) flavor symmetric fragmentation functions, predict zero or negative Lambda polarization. The effect of ${\Sigma }^0$ and ${\Sigma }^{\ast }$ decays is also discussed. Forthcoming experiments at RHIC will be able to differentiate between these predictions.

18 pages, 5 figures

References in corpus (3)

• Quark Structure of $\Lambda$ from $\Lambda$-Polarization in Z Decays
• Expected Polarization of $\Lambda$ particles produced in deep inelastic polarized lepton scattering
• Structure and Production of Lambda Baryons

Cited by in corpus (21)

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• Statistical approach for unpolarized fragmentation functions for the octet baryons
• Spin asymmetries in jet-hyperon production at LHC
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• Double Spin Asymmetries for Large-$p_T$ Hadron Production in Semi-Inclusive DIS
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• Parton Densities and Fragmentation Functions from Polarized Lambda Production in Semi-Inclusive DIS
• Quark Fragmentation Functions in a Diquark Model for $\Lambda$ Production
• Strange quark-antiquark asymmetry of nucleon sea from $\Lambda /\bar{\Lambda }$ polarization
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• Transverse spin polarization as a novel probe of medium-induced transverse-momentum-broadening effect
• Longitudinal spin transfer of Lambda and anti-Lambda in polarized pp collisions at \sqrt s=200 GeV at STAR