Transverse Single Spin Asymmetries and Charmonium Production
Abstract
We estimate transverse spin single spin asymmetry(TSSA) in the process e+p J/ +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 Q2 - evolution was implemented only through DGLAP evolution of unpolarized gluon densities.
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