2018 Impact factor 4.843
Particles and Fields
Eur. Phys. J. C 7, 501-506
DOI 10.1007/s100529801048

Chiral quark model analysis of nucleon quark sea isospin asymmetry and spin polarization

T. Ohlsson - H. Snellman

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 $\eta'$ 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


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