Phenomenological analysis of nucleon strangeness and meson-nucleon sigma terms

2007/11/05 by Feng Huang, Fu-Guang Cao, Fu‐Guang Cao +1 · 1 citation
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph

paper · pdf · doi:10.1103/physrevd.76.114016

published as Phys.Rev.D76:114016,2007 · 13 latex pages, no figure, to appear in PRD

arxiv created 2007/11/05 · openalex publication_date 2007/12/21 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

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 \ensuremathπN (\ensuremathσ_\ensuremathπN) and y_N, we present the results of \ensuremathσ_\ensuremathπN in these two models. Our calculations show that y_N from the chiral quark model is significantly larger than that from the meson cloud model, whereas the difference of \ensuremathσ_\ensuremathπN between the two models is relatively small. We also present the results of \ensuremathσ_KN and \ensuremathσ_\ensuremathηN, which could be determined by \ensuremathσ_\ensuremathπN 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.

Citations

• Updated analysis of meson-nucleonσterms in the perturbative chiral quark model
• Light quark distributions in the proton sea

Cited by

• Orbital angular momentum of the proton and intrinsic five-quark Fock states