Natural Alignment in the Two Higgs Doublet Model

5th Symposium on Prospects in the Physics of Discrete Symmetries

Bhupal Dev, P.S.^1 ; Pilaftsis, Apostolos^2

Department of Physics, McDonnell Center for the Space Sciences, Washington University, St. Louis

MO

63130, United States^1

Consortium for Fundamental Physics, School of Physics and Astronomy, University of Manchester, Manchester

M13 9PL, United Kingdom^2

关键词: Final state;    Fine tuning;    Higgs boson;    Higgs doublet models;    Parameter spaces;    Planck scale;    The standard model;    Third generation;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/873/1/012008/pdf
DOI  :  10.1088/1742-6596/873/1/012008

来源: IOP

【 摘 要 】

As the LHC Higgs data persistently suggest the couplings of the observed 125 GeV Higgs boson to be consistent with the Standard Model (SM) expectations, any extended Higgs sector must lead to the so-called SM alignment limit, where one of the Higgs bosons behaves exactly like that of the SM. In the context of the Two Higgs Doublet Model (2HDM), this alignment is often associated with either decoupling of the heavy Higgs sector or accidental cancellations in the 2HDM potential. We present a novel symmetry justification for 'natural' alignment without necessarily decoupling or fine-tuning. We show that there exist only three different symmetry realizations of the natural alignment scenario in 2HDM. We identify the 2HDM parameter space satisfying the natural alignment condition up to the Planck scale. We also analyze new collider signals for the heavy Higgs sector in the natural alignment limit, which dominantly lead to third-generation quarks in the final state and can serve as a useful observational tool during the Run-II phase of the LHC.