Transverse Single Spin Asymmetries and Charmonium Production
arXiv:1310.0752 · doi:10.1016/j.nuclphysbps.2014.04.010
Abstract
We estimate transverse spin single spin asymmetry(TSSA) in the process $e+p^\uparrow \to J/Ï+X$ using color evaporation model of charmonium production. We take into account transverse momentum dependent(TMD) evolution of Sivers function and parton distribution function and show that the there is a reduction in the asymmetry as compared to our earlier estimates wherein the $Q^2$ - evolution was implemented only through DGLAP evolution of unpolarized gluon densities.
Proceedings of Light Cone 2012, New Delhi, India