Next-to-leading-order corrections to the Higgs strahlung process from electron-positron collisions in extended Higgs models

Abstract

We present the cross section for e + e − → hZ with arbitrary sets of electron and Z boson polarizations at the full next-to-leading order in various extended Higgs models, such as the Higgs singlet model (HSM), the inert doublet model (IDM) and the two Higgs doublet model (2HDM). We systematically perform complete one-loop calculations to the helicity amplitudes in the on-shell renormalization scheme, and present the full analytic results as well as numerical evaluations. The deviation ∆R hZ in the total cross section from its standard model (SM) prediction is comprehensively analyzed, and the differences among these models are discussed in details. We find that new physics effects appearing in the renormalized hZZ vertex almost govern the behavior of ∆R hZ , and it takes a negative value in most cases.The possible size of ∆R hZ reaches several percent under the theoretical and experimental bounds. We also analyze the deviation ∆R hZ XY in the total cross section times decay branching ratios of the discovered Higgs boson by utilizing the H-COUP program. It is found that the four types of 2HDMs can be discriminated by analyzing the correlation between ∆R hZ τ τ and ∆R hZ bb and those between ∆R hZ τ τ and ∆R hZ cc . Furthermore, the HSM and the IDM can be discriminated from the 2HDMs by measuring ∆R hZ W W . These signatures can be tested by precision measurements at future Higgs factories such as the International Linear Collider.

Revisiting one-loop corrections to the trilinear Higgs boson self-coupling in the Inert Doublet Model

“…The rich phenomenology of the IDM has been thoroughly studied in the literature, both in the context of future Higgs factories like the ILC and CLIC and at the LHC . Additionally, there have been many studies of the model that go beyond the lowest order of the perturbation, including those at one-loop level [58][59][60][61][62][63][64][65][66][67][68][69][70][71][72][73] and two-loop order [74][75][76]. The one-loop contributions to the triple Higgs boson coupling from Standard Model particles have been investigated in [58,[77][78][79][80], where it was found that these corrections are dominated by loops involving the top quark.…”

Full one-loop radiative corrections to $e^+ e^-\to H^+H^-$ in the Inert Higgs Doublet Model

“…In order to obtain a sufficient accuracy, one-loop corrections to the various charged Higgs boson production modes and its couplings have to be considered. Recently, one loop radiative corrections to e + e − → Zh 0 [82][83][84] and e + e − → H 0 A 0 [82] in the IHDM have been evaluated. In addition, there are many other works dealing with radiative corrections in the IHDM either at one loop order [82][83][84][85][86][87][88][89][90][91][92][93] or beyond the one-loop level [94][95][96].…”

“…Recently, one loop radiative corrections to e + e − → Zh 0 [82][83][84] and e + e − → H 0 A 0 [82] in the IHDM have been evaluated. In addition, there are many other works dealing with radiative corrections in the IHDM either at one loop order [82][83][84][85][86][87][88][89][90][91][92][93] or beyond the one-loop level [94][95][96]. Full one-loop calculations to e + e − → H + H − in non-supersymmetric models such as the two Higgs doublet model (2HDM) and some supersymmetric models like the real MSSM (rMSSM) and complex MSSM (cMSSM) have been presented in Refs [97][98][99][100][101][102][103][104].…”