Model for the singlet-triplet leptoquarks

DA ROLD, LEANDRO; LAMAGNA, FEDERICO

Physical Review D

APS

Año: 2021 vol. 103 p. 1 - 25

2470-0010

The deviations of B-meson decays measured in RτlK and RτlB can be explained by the presence of two scalar leptoquarks, a singlet S1 and a triplet S3, mostly coupled to the third generation. We consider a theoryof resonances, as an effective description of a strongly interacting theory, that generates the leptoquarks and the Higgs as Nambu-Goldstone bosons, with the rest of the resonances at a scale of order 10?30 TeV. We assume anarchic partial compositeness for the flavor of the SM fermions. Under this hypothesis, we study whether it is possible to reproduce the deviations in the B decays without being in conflict with flavor and electroweak bounds. We find a tension between RτlD and some flavor observables, dominated by flavor violating τ decays and ΔmBs, that require a tuning of order 10%?25%. We also compute the potential of the scalars showing that leptoquarks with masses O(2-3) TeV can be naturally expected in the model. We discuss briefly the phenomenology of the other resonances.