Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2007-11-05
Phys.Rev.D76:114016,2007
Physics
High Energy Physics
High Energy Physics - Phenomenology
13 latex pages, no figure, to appear in PRD
Scientific paper
10.1103/PhysRevD.76.114016
We calculate the nucleon strangeness $y_N$ in the chiral quark model and the meson cloud model. With the internal relation between the sigma term of $\pi$$N$ ($\sigma_{\pi N}$) and $y_N$, we present the results of $\sigma_{\pi N}$ in these two models. Our calculations show that $y_N$ from the chiral quark model is significant larger than that from the meson cloud model, whereas the difference of $\sigma_{\pi N}$ between the two models is relatively small. We also present the results of $\sigma_{K N}$ and $\sigma_{\eta N}$, which could be determined by $\sigma_{\pi N}$ and $y_N$ from their definition in the current algebra, and find that these two physical parameters are quite sensitive to $y_N$. The results indicate the necessity to restrict the parameters of the two models from more precision measurements.
Cao Fu-Guang
Huang Feng
Ma Bo-Qiang
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