Vacuum stability bounds on enhanced couplings of light Higgs fields
Cvetič, Mirjam ; Preitschopf, Christian Richard ; Sher, Marc
In the standard model with more than one Higgs doublet, Yukawa couplings can be enhanced by ratios of vacuum values. Georgi, Manohar and Moore argued that an enhanced t-quark coupling to a light ...Higgs could destabilize the effective potential of this Higgs: they used this argument to rule out an enhanced t-quark coupling to the ?(8.3). We extend their argument to Higgs fields of any mass, critically examine the sensitivity of the result to higher order corrections and to effects of the additional scalars, and we examine the validity of the effective field theory approximation.
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