Abstract
We study the polarized parton distribution functions (PPDFs) from recent experimental data at the next-to-leading order (NLO) approximation in the fixed-flavor number scheme. In this analysis, we can compare our results with experimental data such as very recent COMPASS data. It would be very worth to study the PPDFs parametrization form when we want to use this new COMPASS data in QCD analysis on polarized proton structure and parton distribution functions.
Highlights
Determination of fundamental spin structure in terms of their polarized quarks and gluons is one of the main challenges in polarized hadron physics
Despite the spin physics theory of polarized hadrons has been compatible with the experimental data of polarized nucleon, some fundamental aspects of the polarized parton distribution and structure function are still weakly determined
Very recent analysis on polarized splitting functions in Mellin space has been reported at the next-to-next-to-leading order (NNLO) accuracy
Summary
Determination of fundamental spin structure in terms of their polarized quarks and gluons is one of the main challenges in polarized hadron physics. Despite the spin physics theory of polarized hadrons has been compatible with the experimental data of polarized nucleon, some fundamental aspects of the polarized parton distribution and structure function are still weakly determined. The total angular momentum of the polarized nucleon in terms of its parton spin, i.e. quark (Σ) and gluon spin(G), and quark and gluon orbital momentum (Lq, Lg)is as following In this equation, the first two terms present the fraction of the proton spin which carried by quarks and gluons. It would be worth to be able to measure each contribution in above equation In this regard, we need to have the polarized parton distribution functions (PPDFs) as a function of x and Q2.
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