Polarization in Hadronic ΛHyperon Production and Chiral-Odd Twist-3 Distribution

Abstract

Polarization of the Λhyperon produced with a large transverse momentum in the unpolarized nucleon-nucleon collision is analyzed in the framework of QCD factorization. We focus on the mechanism in which the soft-gluon component of the chiral-odd spin-independent twist-3 quark distribution E_F(x,x) becomes a source of the polarized quark fragmenting into the polarized Λ. Our simple model estimate for this contribution indicates that it gives rise to a significant Λpolarization at large x_F. This is in parallel with the observation that the soft gluon pole mechanism gives rise to a large single transverse spin asymmetry in the pion production at x_F\to 1.

10 pages in LaTex + 5 figures in PS files. Phys. Rev. D in press. Title changed and some discussions added

References in corpus (3)

• Chiral-Odd Contribution to Single-Transverse Spin Asymmetry in Hadronic Pion Production
• Lambda polarization from unpolarized quark fragmentation
• Estimate of a Chiral-Odd Contribution to Single Transverse-Spin Asymmetry in Hadronic Pion Production

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