Lepton-flavored scalar dark matter with minimal flavor violation

Abstract

We explore scalar dark matter that is part of a lepton flavor triplet satisfying symmetry requirements under the hypothesis of minimal flavor violation. Beyond the standard model, the theory contains in addition three right-handed neutrinos that participate in the seesaw mechanism for light neutrino mass generation. The dark-matter candidate couples to standard-model particles via Higgs-portal renormalizable interactions as well as to leptons through dimension-six operators, all of which have minimal flavor violation built-in. We consider restrictions on the new scalars from the Higgs boson measurements, observed relic density, dark-matter direct detection experiments, LEP II measurements on e + e − scattering into a photon plus missing energy, and searches for flavor-violating lepton decays. The viable parameter space can be tested further with future data. Also, we investigate the possibility of the new scalars' couplings accounting for the tentative hint of Higgs flavor-violating decay h → µτ recently detected in the CMS experiment. They are allowed by constraints from other Higgs data to produce a rate of this decay roughly compatible with the CMS finding.

Consequences of R-parity violating interactions for anomalies in $${\bar{B}}\rightarrow D^{(*)} \tau {\bar{\nu }}$$ B ¯ → D ( ∗ ) τ ν ¯ and $$b\rightarrow s \mu ^+\mu ^-$$ b → s μ + μ -

“…This model is similar to the leptoquark exchange discussed by many authors [41][42][43][44][45][46][47][48][49][50][51][52][53][54][55], except a general leptoquark also has a right-handed coupling to SU (2) L singlets, which is forbidden in SUSY. These additional right-handed couplings turn out to be important for explaining the g − 2 anomaly of the muon, but they do not play an essential role in explaining the B anomalies that we are discussing.…”

Dark matter relic from muon anomalies

“…We acknowledge, however, that explicit flavor completions of this model could lead to correlated effects in other mesonphysics and leptonic observables [19,[31][32][33][34][35][36].…”

Leptoquark induced rare decay amplitudesh→τ∓μ±andτCheung1, Keung2, Tseng3 2016Phys. Rev. D

“…from BaBar experiment [3] (2) at low energy. Indeed, there are a lot of theoretical activities [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22] along this line of investigation. There were also a number of studies on LFV Higgs boson decays in literature [23].…”