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Twist-3 fragmentation contribution to polarized hyperon production in unpolarized hadronic collisions
Koike, Y Metz, A Pitonyak, D Yabe, K Yoshida, S
Koike, Y
Metz, A
Pitonyak, D
Yabe, K
Yoshida, S
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Pre-print
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2017-06-01
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10.1103/PhysRevD.95.114013
Abstract
© 2017 American Physical Society. It has been known for a long time that hyperons produced in hadronic collisions are polarized perpendicular to the production plane of the reaction. This effect cannot be described by using twist-2 collinear parton correlators only. Here we compute the contribution of twist-3 fragmentation functions to the production of transversely polarized hyperons in unpolarized proton-proton collisions in the framework of collinear factorization. By taking into account the relations among the relevant twist-3 fragmentation functions which follow from the QCD equation of motion and the Lorentz invariance property of the correlators, we present the leading-order cross section for this term.
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Physical Review D
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