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Chiral quark model with configuration mixing and broken SU(3)\times U(1)symmetry has been extended to include the contribution from c\bar cfluctuations by considering broken SU(4) instead of SU(3). The implications ofsuch a model have been studied for quark flavor and spin distribution functionscorresponding to E866 and the NMC data. The predicted parameters regarding thecharm spin distribution functions, for example, \Delta c, \frac{\Deltac}{{\Delta \Sigma}}, \frac{\Delta c}{c} as well as the charm quark distributionfunctions, for example, \bar c, \frac{2\bar c}{(\bar u+\bar d)}, \frac{2 \barc}{(u+d)} and \frac{(c+ \bar c)}{\sum (q+\bar q)} are in agreement with othersimilar calculations. Specifically, we find \Delta c=-0.009, \frac{\Deltac}{{\Delta \Sigma}}=-0.02, \bar c=0.03 and \frac{(c+ \bar c)}{\sum (q+\barq)}=0.02 for the \chiQM parameters a=0.1, \alpha=0.4, \beta=0.7,\zeta_{E866}=-1-2 \beta, \zeta_{NMC}=-2-2 \beta and \gamma=0.3, the latterappears due to the extension of SU(3) to SU(4).Comment: 10 RevTeX pages. Accepted for publication in Phys. Rev.

SU(4) chiral quark model with configuration mixing