Beyond R(D(*)) with the general type-III 2HDM for

Abstract

We review the parameter regions allowed by measurements of R(D ( * ) ) and by a theoretical limit on B(B c → τ ν) in terms of generic scalar and pseudoscalar new physics couplings, g s and g p . We then use these regions as constraints to predict the ranges for additional observables in b → cτ ν including the differential decay distributions dΓ/dq 2 ; the ratios R(J/ψ) and R(Λ c ); and the tau-lepton polarisation in B → D ( ) τ ν, with emphasis on the CP violating normal polarisation. Finally we map the allowed regions in g s and g p into the parameters of four versions of the Yukawa couplings of the general 2HDM-III model. We find that the model is still viable but could be ruled out by a confirmation of a large R(J/ψ).

Impact of polarization observables and Bc→τν on new physics explanations of the b→cτν anomaly

“…This setup is again motivated by models with extra charged scalars. However, here a generic flavor structure is needed to make O L S the dominant operator [122][123][124][125][126][127][128][129][130][131]…”

Common explanation to the RK(*) , RDMarzo1, Marzola2, Raidal3 2019Phys. Rev. D221110View full textAdd to dashboardCite

“…In recent years, B factories and the LHCb experiment have reported several anomalies [1][2][3][4][5][6][7][8][9][10][11] that find no satisfying explanation in the flavour structure and interactions supported by the standard model (SM) [12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29]. The interpretation of these signals in term of new physics faces, as well, several difficulties, in particular the simultaneous explanation of the R K ( * ) and R D ( * ) measurements proves undoubtedly challenging for the implications on further precision observables that rule out the underlying proposals [30][31][32][33][34][35][36][37].…”

Neutrino masses in a two Higgs doublet model with a U(1) gauge symmetry

“…Two-Higgs-Doublet Models (2HDM) have indeed proven to be interesting models featuring a rich phenomenology concerning collider physics [8][9][10], axion models [11,12], baryogenesis [13][14][15], flavor physics [16][17][18][19][20], among others [21,22]. Several versions of 2HDM have been proposed in the literature trying to improve the original proposal in some theoretical aspects, via the inclusion of dark matter [23][24][25][26][27][28][29][30][31][32] and neutrino masses [33][34][35][36][37][38].…”