Abstract
Color-octet scalars arise in various Grand Unification scenarios and also in other models of new physics. They are also postulated for minimal flavour violation. Purely phenomenological imprints of such scalars are therefore worth looking at. Motivated by this, we perform a complete one-loop calculation of the H^+ rightarrow W^+ Z (gamma ) decay in a two Higgs doublet model augmented by a color-octet SU(2)_L scalar doublet. The computation is conveniently segregated into colorless and colored components. The color-octet part of the amplitude, being scaled by the color-factor, provides an overall enhancement to the form factors. Crucial constraints from perturbative unitarity, positivity of the scalar potential, oblique parameters, Higgs signal strengths and direct search of a charged Higgs and color-octet scalars are folded-in into the analysis. Sensitivity of the loop-induced H^+ rightarrow W^+ Z (gamma ) vertex to other model parameters is elucidated. Finally, the prospect of observing a loop-induced H^+ rightarrow W^+ Z (gamma ) interaction at the future hadronic collisions is also discussed.
Highlights
A two-Higgs doublet model (2HDM) [7,8] is one of such extensions of the SM Higgs sector. It potentially shuts off the flavour changing neutral currents (FCNC), predicts additional CP-violation through the scalar potential that can eventually explain the observed matter-antimatter imbalance, and, poses a solution to the strong CP problem
The first is minimal flavour violation (MFV), which is a framework for having flavour-dependent masses without introducing unwanted flavour changing neutral currents (FCNCs)
We have quantified the strength of the H +W − Z (γ ) interaction in context of an extended scalar sector comprising two color-singlet SU (2)L doublets and a color-octet SU (2)L doublet
Summary
The model considered replaces the scalar sector of the SM by three SU (2)L scalar doublets: two color singlets ( 1, 2) and one color-octet S. For V = γ , the Ward identity enforces the following condition: Vγμν pγ ν = 0 Scalars coming from both colorless and colored sectors, i.e, 1,2 as well as S, contribute to H + → W +V. The amplitude corresponding to each set is UV-finite To this end we introduce nonlinear gauge-fixing functions [47,48,49,50,51,52,53]: f+ =. By virtue of the aforementioned gauge fixing, the amplitudes in Set C (Fig. 3) vanish This implies that similar amplitudes coming from the colorless scalars would vanish.
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