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Polarization of the \Lambda hyperon produced with a large transverse momentumin the unpolarized nucleon-nucleon collision is analyzed in the framework ofQCD factorization. We focus on the mechanism in which the soft-gluon componentof the chiral-odd spin-independent twist-3 quark distribution E_F(x,x) becomesa source of the polarized quark fragmenting into the polarized \Lambda. Oursimple model estimate for this contribution indicates that it gives rise to asignificant \Lambda polarization at large x_F. This is in parallel with theobservation that the soft gluon pole mechanism gives rise to a large singletransverse spin asymmetry in the pion production at x_F\to 1.Comment: 10 pages in LaTex + 5 figures in PS files. Phys. Rev. D in press.  Title changed and some discussions adde

physical review. d. particles, fields, gravitation, and cosmology/physical review. d. particles and fields

Polarization in hadronic<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>Λ</mml:mi></mml:math>hyperon production and chiral-odd twist-3 distribution

Polarization in hadronicΛhyperon production and chiral-odd twist-3 distribution