4.4 Article

A precision constraint on multi-Higgs-doublet models

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IOP PUBLISHING LTD
DOI: 10.1088/0954-3899/35/7/075001

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We derive a general expression for Delta rho (or, equivalently, for the oblique parameter T) in the SU(2) x 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 Delta rho constitutes a strong constraint on the masses and mixings of the scalar particles in that model.

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