Theory and phenomenology of two-Higgs-doublet models

By G. Branco, Pedro Ferreira, L. Lavoura, M. N. Rebelo, M. Sher, J. P. Silva. 2011

2,763 citations recorded by the source corpus.

Abstract We discuss theoretical and phenomenological aspects of two-Higgs-doublet extensions of the Standard Model. In general, these extensions have scalar mediated flavour changing neutral currents which are strongly constrained by experiment. Various strategies are discussed to control these flavour changing scalar currents and their phenomenological consequences are analysed. In particular, scenarios with natural flavour conservation are investigated, including the so-called type I and type II models as well as lepton-specific and inert models. Type III models are then discussed, where scalar flavour changing neutral currents are present at tree level, but are suppressed by either a specific ansatz for the Yukawa couplings or by the introduction of family symmetries leading to a natural suppression mechanism. We also consider the phenomenology of charged scalars in these models. Next we turn to the role of symmetries in the scalar sector. We discuss the six symmetry-constrained scalar potentials and their extension into the fermion sector. The vacuum structure of the scalar potential is analysed, including a study of the vacuum stability conditions on the potential and the renormalization-group improvement of these conditions is also presented. The stability of the tree level minimum of the scalar potential in connection with electric charge conservation and its behaviour under CP is analysed. The question of CP violation is addressed in detail, including the cases of explicit CP violation and spontaneous CP violation. We present a detailed study of weak basis invariants which are odd under CP. These invariants allow for the possibility of studying the CP properties of any two-Higgs-doublet model in an arbitrary Higgs basis. A careful study of spontaneous CP violation is presented, including an analysis of the conditions which have to be satisfied in order for a vacuum to violate CP. We present minimal models of CP violation where the vacuum phase is sufficient to generate a complex CKM matrix, which is at present a requirement for any realistic model of spontaneous CP violation.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/02bcaaaf4d592016762caeb5bb1b188ce85e2a7e

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Citations in the corpus

Baryogenesis from the weak scale to the grand unification scale (2020, methodology): “An important ingredient of leptogenesis is the CP - violating phases in the neutrino mass matrices (Branco et al., 2012a; Hagedorn et al., 2018).”
Standard Model—axion—seesaw—Higgs portal inflation. Five problems of particle physics and cosmology solved in one stroke (2016, background): “Further SMASH opportunities at LHC arise if the DFSZ variant of SMASH is realised, because the latter features a full-fledged two-Higgs-doublet model with all of its exciting electroweak-scale phenomenology [219].”
Search for additional heavy neutral Higgs and gauge bosons in the ditau final state produced in 36 fb$^{-1}$ of $pp$ collisions at $\sqrt{s}$ = 13 TeV with the ATLAS detector (2017, background): “However, it remains possible that the discovered particle is part of an extended scalar sector, a scenario that is predicted by a number of theoretical arguments [15, 16].”
Charged Lepton Flavour Violation: An Experimental and Theoretical Introduction (2017, background): “Here we mention another minimal extension of the Standard Model leading to lepton flavour violation, namely the introduction of a second Higgs doublet [78].”
WIMP dark matter candidates and searches—current status and future prospects (2017, background): “Two Higgs Doublet Models (2HDM) extend the Higgs sector by the addition of another doublet giving rise to additional charged and neutral Higgs bosons [95], see [96] for a review of 2HDM phenomenology.”
New experimental approaches in the search for axion-like particles (2018, background): “A PQ symmetry appears if we forbid terms containing the SM-invariant H† d H ∗ u in the scalar potential, see for instance [75].”
Vector boson fusion at multi-TeV muon colliders (2020, background): “Such scenarios, known in the literature as Two Higgs Doublet Models (2HDMs), have been extensively reviewed [81, 82, 91, 92], particularly for their necessity to realize Supersymmetry in nature.”