A precision constraint on multi-Higgs-doublet models

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We derive a general expression for Δ (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 Δ constitutes a strong constraint on the masses and mixings of the scalar particles in that model.

Document Type: Research Article

DOI: http://dx.doi.org/10.1088/0954-3899/35/7/075001

Publication date: July 1, 2008

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