Correlating tauonic B decays with the neutron electric dipole moment via a scalar leptoquark

Abstract

In this article we investigate the correlations between tauonic B meson decays (e.g. B → τ ν, B → D ( * ) τ ν, B → πτ ν) and electric dipole moments (EDMs), in particular the one of the neutron, in the context of the S1 scalar leptoquark. We perform the matching of this model on the effective field theory taking into account the leading renormalization group effect for the relevant observables. We find that one can explain the hints for new physics in b → cτ ν transitions without violating bounds from other observables. Even more interesting, it can also give sizable effects in B → τ ν, to be tested at BELLE II, which are correlated to (chromo) electric dipole operators receiving mτ /mu enhanced contributions. Therefore, given a deviation from the Standard Model (SM) expectations in B → τ ν, this model predicts a sizable neutron EDM. In fact, even if new physics has CP conserving real couplings, the CKM matrix induces a complex phase and already a 10% change of the B → τ ν branching ratio (with respect to the SM) will lead to an effect observable with the n2EDM experiment at PSI.

Consequences of chirally enhanced explanations of (g − 2)μ for h → μμ and Z → μμ

“…We stress that the phase of the coupling is not determined, and while we will concentrate on the real part in this paper, which interferes with the SM contribution, it is this phase δ that would generate a muon electric dipole moment (EDM) d µ [54], see also refs. [107][108][109][110]. For tan δ = O(1), the resulting |d µ | ∼ 10 −22 e cm could be measured with the proposed muon EDM experiment at PSI using the frozen-spin technique [111].…”

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].…”

μ→eγ selecting scalar leptoquark solutions for the (g−2)e,μDoršner1, Fajfer2, Saad3 2020Phys. Rev. D720340View full textAdd to dashboardCite

“…Also, the S 1 & S 3 scenario might leave an imprint on the h → μ þ μ − process, as discussed recently in Ref. [54], but this type of analysis also depends on additional terms in the Lagrangian that are not featured in our manuscript and we accordingly opt not to perform it.…”