The charge and mass perturbative renormalization in explicitly covariant LFD

We present a study of the flavor asymmetry of polarized anti-quarks in the nucleon using the meson cloud model. We include contributions both from the vector mesons and the interference terms of pseudoscalar and vector mesons. Employing the bag model, we first give the polarized valence quark distribution of the meson and the interference distributions. Our calculations show that the interference effect mildly increases the prediction for at intermediate x region. We also discuss the contribution of “Pauli blocking” to the asymmetry. Received: 12 April 2001 / Revised version: 30 May 2001 / Published online: 19 July 2001