Gluonic Pole Cross Sections and Single Spin Asymmetries in Hadron-Hadron Scattering
摘要
Parton field operators in hadronic matrix elements appearing in transverse momentum dependent distribution functions are connected by gauge-links, which give rise to T-odd effects. Due to the process-dependence of the gauge-links, the T-odd distribution functions appear with different pre-factors. As a consequence, in the description of single spin asymmetries, the parton distribution and fragmentation functions are convoluted with gluonic pole cross sections rather than the basic partonic cross sections. In this paper we calculate the gluonic pole cross sections encountered in single spin asymmetries in hadron-hadron scattering. The case of back-to-back pion production in polarized proton-proton scattering is worked out explicitly. It is shown how T-odd gluon distribution functions originating from gluonic pole matrix elements appear in twofold.
引用
@article{arxiv.hep-ph/0609206,
title = {Gluonic Pole Cross Sections and Single Spin Asymmetries in Hadron-Hadron Scattering},
author = {C. J. Bomhof and P. J. Mulders},
journal= {arXiv preprint arXiv:hep-ph/0609206},
year = {2010}
}
备注
v2: includes explicit definitions of polarized cross sections + minor corrections; to appear in JHEP