Abstract
It is pointed out that a fit to the baryon-octet mass spectrum to the first order of SU (3) breaking indicates unambiguously substantial sea-quark content in the baryon at rest. Owing to the presence of sizeable strange quark-antiquark pairs in the nucleon as implied by the pion-nucleon sigma term, the effective low-energy scalar Higgs-nucleon coupling gφNN ≈ 2.2. × 10−3 is dominated by strange quarks rather than by heavy quarks. The couplings gφσσ and gφξξ are estimated to be 3.2 × 10−3 and 3.7 × 10−3, respectively. Supplemented by the 1/Nc expansion (Nc being the number of colors) and by recent EMC measurement on the proton polarized structure functions, the coupling of the pseudoscalar Higgs boson to nucleons is fixed. A discussion of axion couplings is given.
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