Chiral symmetry and the Higgs-boson-nucleon coupling.
Chiral symmetry and the Higgs-boson-nucleon coupling.
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DOI：
10.1103/physrevd.38.2869
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发表时间：
1988-11
期刊：
影响因子：
--
通讯作者：
Ta-Pei Cheng
中科院分区：
文献类型：
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作者：
Ta-Pei Cheng
从介子-核子的相移和色散分析中提取的手征对称性破缺的西格玛项表明，希格斯玻色子与核子的耦合是由奇异夸克主导的。Sigma/SUB..pi.//SUB N/约.=60 MeV奇夸克的贡献比任何其他物质的贡献大一个数量级。这大大增加了希格斯-玻色子-核子耦合的手征对称值。简要讨论了一些现象学结果。特别是，我重新分析了反对轻标量玻色子存在的低能核和原子实验证据，并将这些界限与最初预期的核子主要由上下夸克组成的界限进行了比较。还提供了关于大的.pi..N西格玛项的各种问题的总结回顾。
The chiral-symmetry-breaking sigma 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 sigma/sub ..pi..//sub N/approx. =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 ..pi..N sigma term is also provided.