Electroweak Corrections from Triplet Scalars
Zuhair U. Khandker, Daliang Li, and Witold Skiba
TL;DR
This paper calculates the electroweak S and T parameters induced by SU(2)_L triplet scalars at one-loop order, providing constraints on triplet mass and couplings within an effective field theory framework.
Contribution
It presents the first comprehensive one-loop calculation of electroweak parameters from triplet scalars considering the most general potential and renormalization group effects.
Findings
S and T parameters decouple at large mass scales.
Bounds on triplet mass and couplings are derived from electroweak precision data.
Effective field theory approach enables analysis in unbroken symmetry phase.
Abstract
We compute the electroweak S and T parameters induced by SU(2)_L triplet scalars up to one-loop order. We consider the most general renormalizable potential for a triplet and the Standard Model Higgs doublet. Our calculation is performed by integrating out the triplet at the one-loop level and also includes the one-loop renormalization group running. Effective field theory framework allows us to work in the phase with unbroken SU(2)_L x U(1)_Y symmetry. Both S and T parameters exhibit decoupling when all dimensionful parameters are large while keeping dimensionless ratios fixed. We use bounds on S and T to constrain the triplet mass and couplings.
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