Chiral symmetry and the Higgs-boson–nucleon coupling
- 1 November 1988
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review D
- Vol. 38 (9), 2869-2874
- https://doi.org/10.1103/physrevd.38.2869
Abstract
The chiral-symmetry-breaking σ term as extracted from the pion-nucleon phase-shift and dispersion analysis implies that the Higgs boson coupling to the nucleon is dominated by the strange quarks. For ≃60 MeV the strange-quark contribution is an order of magnitude larger than that of any other flavor. This significantly increases the Higgs-boson–nucleon coupling from its chiral-symmetric value. Some of the phenomenological consequences are briefly discussed. In particular I reanalyze the low-energy nuclear and atomic experimental evidence against the existence of a light scalar boson, and compare the bounds to those originally derived with the expectation that the nucleon consists mainly of the up and down quarks. A summary review of the various issues concerning a large πN σ term is also provided.
Keywords
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