Statistical Evaluation Of First And Second Moments Of Quark And Anti-Quark Helicity

We evaluate quark helicity distribution inside a nucleon in the kinematic region 0.02 < x < 0.6 at Q2 = 2.5 GeV2 and first and second moment of polarized valence up and valence down quark using Thermodynamical Bag Model (TBM). Theoretical results are in good agreement with HERMES and SMC experimental results.