Addressing the RD(*) anomalies with an

Abstract

Motivated by the R D ( * ) anomalies, we investigate an SO(10) grand unification scenario where a charge −1/3 scalar leptoquark (S1) remains as the only new physics candidate at the TeV scale. This leptoquark along with the Standard Model (SM) Higgs doublet originates from the same ten-dimensional real scalar multiplet in the SO(10) grand unification framework taking its mass close to the electroweak scale. We explicitly show how the gauge coupling unification is achieved with only one intermediate symmetrybreaking scale at which the Pati-Salam gauge group is broken into the SM group. We investigate the phenomenological implications of our scenario and show that an S1 with a specific Yukawa texture can explain the R D ( * ) anomalies. We perform a multiparameter scan considering the relevant flavour constraints on R D ( * ) , FL(D * ), Pτ (D * ) and R νν K ( * ) as well as the constraint coming from the Z → τ τ decay and the latest τ τ resonance search data at the LHC. Our analysis shows that a single leptoquark solution to the observed R D ( * ) anomalies with S1 is still a viable solution.

R2 as a single leptoquark solution to RD(*Попов1, Schmidt2, White3 2019Phys. Rev. D701430View full textAdd to dashboardCite

“…[20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38] for a leptoquark solution to the R K ðÃÞ anomalies, Refs. [34,[39][40][41][42][43][44][45] for the R D ðÃÞ anomalies and Refs. [34, for simultaneous explanations).…”

Low-energy phenomenology of scalar leptoquarks at one-loop accuracy

“…1 Several works have been dedicated to study their phenomenology. The S 1 leptoquark has been considered as possible mediator for all anomalies [32][33][34][35][36][37][38][39][40][41], with varying degree of success. S 3 , instead, has long been recognized to be a very good candidate to address the deviations in the b → sµµ transition [42][43][44][45][46][47][48][49].…”

Enhancing scalar productions with leptoquarks at the LHC

“…We can use Eq. (19) or (20) to compute the partial decay width for the h → qq decay in the rest frame of the Higgs as…”

“…In recent times, LQ models (with or without right-handed neutrinos) have drawn attention for various reasons. For example, they can be used to explain different B-meson anomalies [11][12][13][14][15][16][17][18][19][20] or to enhance flavor violating decays of Higgs and leptons like τ → μγ and h → τμ [21]. LQs may also play a role to accommodate dark matter abundance [22,23] or to mitigate the discrepancy in the anomalous magnetic moment of muon ðg − 2Þ μ [24][25][26].…”

“…Contributions of the three diagrams shown inFig. 1to the Yukawa couplings obtained from Eq (19). or(20) for some illustrative choices of the mass of the right-handed neutrino M ν R and the leptoquark mass M S 1 while keeping g 2 y ν ¼ 1 and λ ¼ 1.…”