Transverse single spin asymmetry in direct photon production in polarized pA collisions
High Energy Physics - Phenomenology
2015-02-10 v3
Abstract
We study the transverse single spin asymmetry in direct photon production in pA collisions with incoming protons being transversely polarized. To facilitate the calculation, we formulate a hybrid approach in which the nucleus is treated in the Color Glass Condensate (CGC) framework while the collinear twist-3 formalism is applied on the proton side. It has been found that an additional term which arises from color entanglement shows up in the spin dependent differential cross section. The fact that this additional term is perturbatively calculable allows us to quantitatively study color entanglement effects.
Keywords
Cite
@article{arxiv.1404.5809,
title = {Transverse single spin asymmetry in direct photon production in polarized pA collisions},
author = {Andreas Schäfer and Jian Zhou},
journal= {arXiv preprint arXiv:1404.5809},
year = {2015}
}
Comments
20 pages, 6 figures, a few typos corrected, v3