Phenomenology of the Higgs sector from Reduction of Couplings in the Type-II 2HDM

TL;DR

This paper performs a detailed phenomenological analysis of the Higgs sector in a Type-II 2HDM with reduction of couplings, incorporating advanced theoretical calculations and experimental constraints to refine predictions of Higgs properties.

Contribution

It introduces a comprehensive, higher-order calculation framework for the Higgs sector in the reduced Type-II 2HDM, including all relevant corrections and experimental data.

Findings

Higgs boson masses and decay widths are consistent with experimental data.

Refined top quark mass prediction within the reduction of couplings framework.

Enhanced theoretical precision improves the model's phenomenological viability.

Abstract

The idea of reduction of couplings provides a systematic procedure to search for relations among seemingly unrelated parameters of a renormalizable theory. As a consequence, such reduced theories exhibit more constrained parameter spaces. Motivated by this, in this work we perform a precise phenomenological analysis of the Higgs sector of a version of the Type-II 2HDM on which the idea of reduction of couplings has been applied. We compute Higgs boson masses and decay widths and confront them with current experimental measurements. Compared to the previous study, apart from the inclusion of actual experimental constraints on production and decay rates of Higgs bosons, we also include all model parameters in the RGE running as well as one- and two-loop threshold corrections and two-loop RGE running from the high scale. Furthermore, Higgs boson masses are now computed at the one-loop level. Top quark mass, which is an important prediction of the reduction framework, is now evaluated including previously missing sub-leading one-loop contributions, with an addition of up to four-loop pure-QCD corrections.