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arXiv · 1703.09399

Twist-3 fragmentation contribution to polarized hyperon production in unpolarized hadronic collisions

Yuji Koike·Andreas Metz·Daniel Pitonyak·Kenta Yabe·Shinsuke Yoshida
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Abstract

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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Yuji Koike, Andreas Metz, Daniel Pitonyak, Kenta Yabe, Shinsuke Yoshida. 2017-03-28. Twist-3 fragmentation contribution to polarized hyperon production in unpolarized hadronic collisions. https://doi.org/10.1103/physrevd.95.114013

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