Leptoquark patterns unifying neutrino masses, flavor anomalies, and the diphoton excess

$R_{D^{(\ast)}}$, $R_{K^{(\ast)}}$ and neutrino mass in the 2HDM-III with right-handed neutrinos

“…The latest world-averaged results compiled by the Heavy Flavor Averaging Group (HFLAV) [12] read: R D * = 0.306 ± 0.013(stat) ± 0.007(syst) and R D = 0.407 ± 0.039(stat) ± 0.024(syst), which indicate a combined deviation from the SM values R SM D * ≈ 0.26 [13][14][15][16] and R SM D ≈ 0.30 [14,[16][17][18][19] at the level of 4σ. Thus far, feasible NP scenarios based on model-independent analyses [13,[20][21][22][23][24][25][26][27][28][29][30][31][32] as well as model-dependent constructions such as leptoquarks [33][34][35][36][37][38][39][40][41][42] and two-Higgs-doublet models (2HDM) [35,[43][44][45][46] have been extensively studied towards an explanation of the R D ( * ) anomalies. In particular, the general 2HDM of type-III (2HDM-III) with tree-level flavor-changing neutral current (FCNC) can address the R D ( * ) anomalies [44][45][46], but suffers severe constraint from the B − c lifetime [38,…”

“…The R K result deviates from the SM value R SM K = 1.00 ± 0.01 [52][53][54] in the same q 2 region at the level of 2.6σ, while the R K * measurements deviate from the SM predictions 1 by 2.1 ∼ 2.3σ for the first and 2.4 ∼ 2.5σ for the second q 2 region, depending on the theoretical predictions used [51]. The R K ( * ) deficits stir up both model-independent global analyses [53,[55][56][57][58][59][60][61][62][63][64][65][66][67][68] and model-dependent NP constructions such as the Z models [69][70][71][72][73][74][75][76][77][78][79][80] and the leptoquark models [33][34][35][36][37][81][82][83][84]. It is generally found that reasonable explanations for the R K ( * ) anomalies at the second q 2 region can be achieved, while the resolution to the R K * deficit at the first q 2 region requires more involved NP scenario [64,66].…”

Remarks on the Standard Model predictions for R(D) and R(D*Kim1, López-Castro2, Tostado3 et al. 2017Phys. Rev. D220222View full textAdd to dashboardCite

“…These hints of a possible violation of lepton universality have prompted many theoretical proposals, which include the exchange of charged scalars [12][13][14][15][16][17][18][19], leptoquarks (or, equivalently, R-parity violating supersymmetry) [16,18,[20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37], vector resonances [38] or a W boson [18,36,[39][40][41][42].…”

Non-abelian gauge extensions for B-decay anomalies

“…The possibility of a leptoquark origin for these anomalies was subsequently explored in more detail in Refs. [28][29][30][31][32][33], making also interesting connections to other possible phenomena such as neutrino masses.…”