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Particles and Fields


Eur. Phys. J. C 21, 105-114 (2001)
DOI: 10.1007/s100520100726

The flavor asymmetry of polarized anti-quarks in the nucleon

F.-G. Cao and A.I. Signal

Institute of Fundamental Sciences, Massey University, Private Bag 11 222, Palmerston North, New Zealand

f.g.cao@massey.ac.nz
a.i.signal@massey.ac.nz

(Received: 12 April 2001 / Revised version: 30 May 2001 / Published online: 19 July 2001 -© Springer-Verlag / Società Italiana di Fisica 2001 )

Abstract
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 $\rho$ meson and the interference distributions. Our calculations show that the interference effect mildly increases the prediction for $
\Delta {\bar d}(x)-
\Delta {\bar u}(x)$ at intermediate x region. We also discuss the contribution of "Pauli blocking" to the asymmetry.



© Società Italiana di Fisica, Springer-Verlag 2001