9-14 September 2018
University of Ferrara
Europe/Rome timezone

Twist-3 fragmentation contribution to single transverse-spin asymmetry in polarized hyperon production

Not scheduled
University of Ferrara

University of Ferrara

Polo degli Adelardi Via Adelardi 33 Ferrara Italy
Parallel Sessions 3D Structure of the Nucleon: TMDs


Mr Kenta Yabe (Niigata University)


We discuss the contribution of the twist-3 fragmentation function to the production of transversely polarized hyperons in unpolarized proton-proton collisions. In the framework of the collinear factorization, this contribution arise from the quark fragmentation correlators corresponding to the twist-3 quark fragmentation functions(FFs) and especially from the gluon fragmentation correlators corresponding to the twist-3 2-gluon and 3-gluon FFs. For the former contribution, we calculated the frame-independent cross-section by taking into account the constraint relations among twist-3 FFs which follow from the QCD equation-of-motion and the Lorentz invariance property of the nonlocal operators. In the same way, we derived the formalism for the later contribution by using collinear expansion and the equation-of-motion among twist-3 gluon FFs. In this talk, we first show the overview of the calculation of the twist-3 quark fragmentation contribution and then present our recent study for the twist-3 gluon fragmentation contribution.

Primary author

Mr Kenta Yabe (Niigata University)


Prof. Yuji Koike (Niigata University)

Presentation Materials