Papers › On the addition of a large scalar multiplet to the Standard Model
On the addition of a large scalar multiplet to the Standard Model
Darius Jurčiukonis, Luís Lavoura
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We consider the addition of a single SU(2) multiplet of complex scalar fields to the Standard Model (SM). We explicitly consider the various possible values of the weak isospin J of that multiplet, up to and including J = 7/2. We allow the multiplet to have arbitrary weak hypercharge. The scalar fields of the multiplet are assumed to have no vacuum expectation value; the mass differences among the components of the multiplet originate in its coupling, present in the scalar potential (SP), to the Higgs doublet of the SM. We derive exact bounded-from-below and unitarity conditions on the SP, thereby constraining those mass differences. We compare those constraints to the ones that may be derived from the oblique parameters.
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