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Nonstandard Higgs Boson Decays

2008; Annual Reviews; Volume: 58; Issue: 1 Linguagem: Inglês

10.1146/annurev.nucl.58.110707.171200

1545-4134

Spencer Chang, Radovan Dermíšek, John F. Gunion, Neal Weiner,

Cosmology and Gravitation Theories

This review summarizes the motivations for and phenomenological consequences of nonstandard Higgs boson decays, with emphasis on final states containing a pair of non-Standard-Model particles that subsequently decay to Standard Model particles. Typically these non-Standard-Model particles are part of a ``hidden'' sector, for example a pair of neutral Higgs bosons or a pair of unstable neutralinos. We emphasize that such decays allow for a Higgs substantially below the Standard Model Higgs LEP limit of 114 GeV. This in turn means that the ``fine-tuning'' problems of many Beyond the Standard Model (BSM) theories, in particular supersymmetric models, can be eliminated while achieving excellent consistency with precision electroweak data which favor a Higgs boson with mass below $100\gev$ and standard $WW$, $ZZ$, and top couplings.