Nexttoleadingorder corrections to the Higgs strahlung process from electronpositron collisions in extended Higgs models
Abstract
We present the cross section for e^{+}e^{}→h Z with arbitrary sets of electron and Z boson polarizations at the full nexttoleading 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 oneloop calculations to the helicity amplitudes in the onshell renormalization scheme, and present the full analytic results as well as numerical evaluations. The deviation Δ 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 Δ R^{hZ} , and it takes a negative value in most cases. The possible size of Δ R^{hZ} reaches several percent under the theoretical and experimental bounds. We also analyze the deviation Δ R_{XY}^{hZ} in the total cross section times decay branching ratios of the discovered Higgs boson by utilizing the HCOUP program. It is found that the four types of 2HDMs can be discriminated by analyzing the correlation between Δ R_{τ}^{τ hZ} and Δ R_{bb}^{hZ} and those between Δ R_{τ}^{τ hZ} and Δ R_{cc}^{hZ} . Furthermore, the HSM and the IDM can be discriminated from the 2HDMs by measuring Δ R_{WW}^{hZ} . These signatures can be tested by precision measurements at future Higgs factories such as the International Linear Collider.
 Publication:

European Physical Journal C
 Pub Date:
 November 2021
 DOI:
 10.1140/epjc/s10052021097648
 arXiv:
 arXiv:2109.02884
 Bibcode:
 2021EPJC...81.1000A
 Keywords:

 High Energy Physics  Phenomenology;
 High Energy Physics  Experiment
 EPrint:
 50 pages, 14 figures