Collider constraints on lepton flavor violation in the 2HDM

Abstract

In light of the recent CMS analysis on lepton flavor violating (LFV) heavy Higgs searches and updated bounds on various search channels involving neutral and charged scalars, we provide the updated constraints on the Type-III Two-Higgs-Doublet-Model (2HDM) with a τ − µ LFV. In doing so, we first extend the CMS analysis to cover the mass region below 200 GeV by recasting their data. After obtaining the bounds on the heavy Higgs production in the mass range between 130 GeV and 450 GeV, we analyze the parameter space of the Type-III 2HDM with various scenarios of mass spectrum and heavy Higgs production strengths. We found that in most scenarios, searching for the heavy Higgs in the mass range lower than 2mW is very important in constraining the parameter space of the Type-III 2HDM. Hence, we suggest for the future analysis that the search window for the LFV heavy Higgs be extended to the lower mass region. * rprimulando@unpar.ac.id † julio@lipi.go.id ‡ patipan@g.swu.ac.th 1 In other variants of the 2HDM without tree-level flavor violation, there is a discrete symmetry making only one Higgs doublet couple to one type of fermions [8]. These variants, commonly called Type-I or Type-II 2HDM, are extensively studied.

The General One-loop Structure for the LFV Higgs Decays $H_r \to l_a l_b$ in multi-Higgs Models with Neutrino Masses

“…Non-minimal Higgs sectors have been studied and bounds on deviations from the SM Higgs couplings have been studied too [10][11][12][13][14][15] NP models often include a Higgs boson with new features, for instance, besides SM deviations contained in the Flavor-Conserving (FC) Higgs-fermion couplings, it is possible to have Flavor-Violating (FV) Higgs-fermions interactions. These FV Higgs couplings could arise at tree-level, as in the Two-Higgs Doublet Model (2HDM) [16][17][18][19], or they could be induced at loop-levels too, as in the Minimal SUSY SM (MSSM) [20][21][22]. It is possible to probe these Lepton Flavor Violation (LFV) effects at low-energies, through the LFV decays l b → l a + γ, l a → l b l b l c [22][23][24][25].…”

“…The fact that the LHC has searched for these LFV Higgs modes, and that the coming phase (with higher luminosity) will make possible to derive more restrictive bounds, has motivated interest from the theoretical side, with multiple studies using this LFV Higgs signal to probe a variety of models, including: 2HDM [36][37][38], models with a low-scale flavors mixing with the SM-like Higgs boson [39], models with 3-3-1 gauge symmetry [32], See-Saw and its inverse version [22,33], as well as SUSY models, such as the MSSM [40,41].…”

Collider prospects for the muon g−2 in a general two-Higgs-doublet model

“…We note in passing that g2HDM has been invoked in weaker (considered as a perturbation hence keeping tan β) form [48], where having rather small ρ τ µ called for relatively light m A . In a similar vein, a reinterpretation [49] of the CMS gg → H → τ µ search [24] also urged for probing below m H = 200 GeV. These suggestions are not invalid, but we chose m H within the search range of CMS at a typical weak scale to illustrate how g2HDM may resolve muon g − 2.…”

Generalized 2HDM with wrong-sign lepton-Yukawa coupling, in light of $$g_{\mu }-2$$ and lepton flavor violation at the future LHC

“…These decays are induced at loop level by the tree-level flavor-violating couplings between the scalars and the leptons. These treelevel flavor-violating Yukawa couplings can be probed at the collider experiments [35,36,45,46].…”