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29 March 2024
 
  » arxiv » hep-ph/0012225

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Polarization in Hadronic Lambda Hyperon Production and Chiral-Odd Twist-3 Distribution
Y. Kanazawa ; Yuji Koike ;
Date 18 Dec 2000
Journal Phys.Rev. D64 (2001) 034019
Subject hep-ph
AffiliationNiigata Univ.
AbstractPolarization 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 o 1.
Source arXiv, hep-ph/0012225
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