PoS - Proceedings of Science
Volume 284 - QCD Evolution 2016 (QCDEV2016) - Wednesday, June 01, 2016 - Morning 2
Twist-3 asymmetries in proton-proton collisions
Y. Koike*, D. Pitonyak, K. Yabe and S. Yoshida
Full text: pdf
Pre-published on: February 10, 2017
Published on: March 28, 2017
We discuss two twist-3 spin asymmetries in $pp$ collisions. One is the transverse polarization of hyperons produced in unpolarized $pp$ collisions, and the other is the spin asymmetry for the hadron production in the collision between the longitudinally and transversely polarized protons. The former is a naively ``$T$-odd" observable, while the latter is a naively ``$T$-even" one, and this leads to inherently different form of the corresponding twist-3 cross sections. Since both asymmetries occur as a result of multi-parton correlations
either in the initial protons or in the fragmentation process, they play a complementary role to test the theoretical framework and to give an insight on the hadron structure. Measurement of these asymmetries at RHIC will be particularly interesting.
DOI: https://doi.org/10.22323/1.284.0029
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