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

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

2000-12-18

arxiv.org/abs/hep-ph/0012225v2

Phys.Rev. D64 (2001) 034019

Physics

High Energy Physics

High Energy Physics - Phenomenology

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

Scientific paper

10.1103/PhysRevD.64.034019

Polarization of the \Lambda hyperon 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 \Lambda. Our simple model estimate for this contribution indicates that it gives rise to a significant \Lambda polarization 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.

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