Isovector helicity quark quasi-distributions inside a large Nc nucleon

Abstract

In this letter, we report the results for the isovector polarized quark quasi-distribution functions $\Delta u(x,v)-\Delta d(x,v)$ in the large $N_c$, calculated within the chiral quark-soliton model. It is shown that the polarized quark quasi-distributions present good convergence to the light-cone PDFs in the limit of the nucleon boost momentum $P_N\to \infty$ (or the velocity $v\to 1$), compared to the case of the unpolarized isosinglet distributions.

Comments: 12 pages and 7 figures. Version accepted for publication in Physics Letters B