Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2003-05-30
Int.J.Mod.Phys.A19:5027-5042,2004
Physics
High Energy Physics
High Energy Physics - Phenomenology
15 pages, LaTeX, version to appear in Int. Jol. of Mod. Phys. A
Scientific paper
10.1142/S0217751X04019949
Using \chiQM with configuration mixing, the contribution of the gluon polarization to the flavor singlet component of the total spin has been calculated phenomenologically through the relation \Delta\Sigma(Q^2)=\Delta\Sigma-\frac{3\alpha_s(Q^2)}{2\pi}\Delta g(Q^2) as defined in the Adler-Bardeen scheme, where \Delta\Sigma on the right hand side is Q^2 independent. For evaluation the contribution of gluon polarization \Delta g'(=\frac{3\alpha_s(Q^2)}{2\pi}\Delta g(Q^2)), \Delta\Sigma is found in the \chiQM by fixing the latest E866 data pertaining to \bar u-\bar d asymmetry and the spin polarization functions whereas \Delta \Sigma(Q^2) is taken to be 0.30\pm0.06 and \alpha_s= 0.287\pm0.020, both at Q^2=5{\rm GeV}^2. The contribution of gluon polarization \Delta g' comes out to be 0.33 which leads to an almost perfect fit for spin distribution functions in the \chiQM. When its implications for magnetic moments are investigated, we find perfect fit for many of the magnetic moments. If an attempt is made to explain the angular momentum sum rule for proton by using the above value of \Delta g', one finds the contribution of gluon angular momentum to be as important as that of the q \bar q pairs.
Dahiya Harleen
Gupta Manmohan
No associations
LandOfFree
Chiral quark model and the nucleon spin does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Chiral quark model and the nucleon spin, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Chiral quark model and the nucleon spin will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-395509