Regular Article - Theoretical Physics
x-dependence of the quark distribution functions in the χCQMconfig
Department of Physics, Centre of Advanced Study in Physics, Panjab University, Chandigarh, 160 014, India
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Revised: 31 August 2007
Published online: 26 September 2007
Chiral constituent quark model with configuration mixing (χCQMconfig) is known to provide a satisfactory explanation of the “proton spin problem” and related issues. In order to enlarge the scope of χCQMconfig, we have attempted to phenomenologically incorporate x-dependence in the quark distribution functions. In particular, apart from calculating valence and sea quark distributions qval(x) and q̄(x), we have carried out a detailed analysis to estimate the sea quark asymmetries d̄(x)-ū(x), d̄(x)/ū(x) and as well as spin independent structure functions F2 p(x)-F2 n(x) and F2 n(x)/F2 p(x) as functions of x. We are able to achieve a satisfactory fit for all the above mentioned quantities simultaneously. The inclusion of effects due to configuration mixing have also been examined in the case F2 p(x)-F2 n(x) and F2 n(x)/F2 p(x) where the valence quark distributions dominate and it is found that it leads to considerable improvement in the results. Further, the valence quark structure has also be tested by extrapolating the predictions of our model in the limit x→1 where data is not available.
© Springer-Verlag / Società Italiana di Fisica, 2007