Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1997-01-08
Phys.Rev.D57:344-349,1998
Physics
High Energy Physics
High Energy Physics - Phenomenology
16 pages, Latex (uses Revtex), to be submitted to Phys. Rev. D
Scientific paper
10.1103/PhysRevD.57.344
The chiral quark model with a nonet of Goldstone bosons can yield an adequate description of the observed proton flavor and spin structure. In a previous publication we have compared the results of a SU(3) symmetric calculation with the phenomenological findings based on experimental measurements and SU(3) symmetry relations. In this paper we discuss their SU(3) and axial-U(1) breaking corrections. With two parameters, we obtain a very satisfactory fit to the F/D ratios for the octet baryon masses and for their axial vector couplings, as well as the different quark flavor contributions to the proton spin. The result also can account for, not only the light u and d quark asymmetry, but also the strange quark content, of the proton sea. SU(3) breaking is the key in reconciling the strange quark fraction as measured in the neutrino charm production and that as deduced from the pion nuleon sigma term.
Cheng Ta-Pei
Li Ling-Fong
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