The muon g – 2 for low-mass pseudoscalar Higgs in the general 2HDM

Adriano Cherchiglia,Dominik Stöckinger,Hyejung Stöckinger-Kim

doi:10.1051/epjconf/201817901022

Abstract

The two-Higgs doublet model is a simple and attractive extension of the Standard Model. It provides a possibility to explain the large deviation between theory and experiment in the muon g – 2 in an interesting parameter region: light pseudoscalar Higgs A, large Yukawa coupling to τ-leptons, and general, non-type II Yukawa couplings are preferred. This parameter region is explored, experimental limits on the relevant Yukawa couplings are obtained, and the maximum possible contributions to the muon g – 2 are discussed.

Highlights

The experiments at the LHC have not identified clear evidence for physics beyond the Standard Model (SM). This is regularly taken as an indication that new physics particles, if they exist, must be rather heavy
Ref. [5] considered precision computations in the MSSM, which are important in cases with a partially heavy spectrum of supersymmetric particles, and all these results were implemented in the program GM2Calc [6]
In the remainder of these proceedings we focus on an alternative idea, to consider models which can provide significant contributions to aμ only for very light new particles, which are still viable

Summary

Introduction

The experiments at the LHC have not identified clear evidence for physics beyond the Standard Model (SM). [9] the 2HDM prediction for aμ has been derived at the full two-loop level (which corresponds to leading order), and in reference [10], experimental constraints are exploited to obtain the possible allowed ranges of all contributions and identify the parameter space of the general 2HDM, which can explain aμ. In the 2HDM the muon g − 2 receives contributions from one- and two-loop diagrams.

Results

Conclusion