Twist-3 approach to hyperon polarization in unpolarized proton-proton collision

Apr 12, 2016, 5:10 PM
SR4a (DESY Hamburg)


DESY Hamburg

Spin Physics WG6 Spin Physics


Mr Kenta Yabe (Niigata University)


We study the transverse porlarization of hyperons produced in the high-energy unporlarized proton-proton collision in the framework of the collinear factorization. This phenomenon is one of the twist-3 observables and twist-3 distribution and fragmentation functions contribute. In this work, we focus on the former contribution and derive the LO complete cross-section. For the soft-gluon-pole term, we develope the”Master formula” which simplify the procedure of calculation and show explicitly that only the derivative term contributes. Moreover, we calculate the soft-felmion-pole contribution for the first time and show that it vanishes. These results provide a useful tool to explain the mechanism of the hyperon porlarization.

Primary author

Prof. Yuji Koike (Niigata University)


Mr Kenta Yabe (Niigata University) Dr Shinsuke Yoshida (Central China Normal University)

Presentation materials