FCNCs in left-right symmetric theories and constraints on the right-handed scale

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We revise the limits on the FCNC Higgs bosons in manifestly left-right symmetric theories. It is shown that the combination of Kobayashi-Maskawa [Formula presented] violation with tree-level [Formula presented] Higgs boson exchange gives a very large contribution to the [Formula presented]-violating [Formula presented] parameter. It leads to a new strong constraint on the FCNC Higgs boson mass, [Formula presented]–100 TeV, enhanced by a factor of the order of [Formula presented]. Being addressed to the supersymmetric left-right models, the FCNC problem requires that both the right-handed scale and supersymmetric mass parameters be heavier than [Formula presented] TeV for [Formula presented]. The most relaxed case corresponds to [Formula presented]–30 where the right-handed scale can be of the order of a few TeV.

Original languageEnglish (US)
Pages (from-to)259-264
Number of pages6
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Issue number1
StatePublished - 1997
Externally publishedYes

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