Natural Alignment in the Two Higgs Doublet Model

P. S. Bhupal Dev, Apostolos Pilaftsis

    Research output: Contribution to journalConference articlepeer-review


    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.

    Original languageEnglish
    Article number012008
    JournalJournal of Physics: Conference Series
    Issue number1
    Early online date27 Jul 2017
    Publication statusPublished - 2018
    Event5th Symposium on Prospects in the Physics of Discrete Symmetries, DISCRETE 2014 - Warsaw, Poland
    Duration: 28 Nov 20163 Dec 2016


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