DOI 10.1007/s100529801048
Chiral quark model analysis of nucleon quark sea isospin asymmetry and spin polarization
Theoretical Physics, Department of Physics, Royal Institute of Technology, SE-100 44 Stockholm, Sweden
Received: 17 June 1998 / Published online: 3 December 1998
Abstract
We analyze recent measurements of the nucleon quark sea isospin
asymmetry in terms of the chiral quark model. The new measurements
indicate that the SU(3) model with modest symmetry breaking and no
Goldstone boson gives a satisfactory description of data. We
also discuss the matching parameter for the axial-vector current.
Finally, we analyze the nucleon quark spin polarization measurements
directly in the chiral quark model without using any SU(3) symmetry
assumption on the hyperon axial-vector form factors. The new data
indicate that the chiral quark model gives a remarkably good and
consistent description of all low energy baryon measurements.
Author for correspondance: snell@theophys.kth.se
Copyright Springer-Verlag
