We derive a general expression for Δρ (or, equivalently, for the oblique parameter T ) in the SU (2) × U (1) electroweak model with an arbitrary number of scalar SU (2) doublets, with hypercharge ±1/2, and an arbitrary number of scalar SU (2) singlets. The experimental bound on Δρ constitutes a strong constraint on the masses and mixings of the scalar particles in that model.
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Lavoura et al. (2008) studied this question.
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