Flavor phenomenology of the leptoquark singlet-triplet model

In recent years, experiments revealed intriguing hints for new physics (NP) in semi-leptonic B decays. Both in charged current processes, involving b -> c tau nu transitions, and in the neutral currents b -> sl(+)l(-), a preference for NP compared to the standard model (SM) of more that 3 sigma and 5 sigma was found, respectively. In addition, there is the long-standing tension between the theory prediction and the measurement of the anomalous magnetic moment (AMM) of the muon (a(mu)) of more than 3 sigma. Since all these observables are related to the violation of lepton flavor universality (LFU), a common NP explanation seems not only plausible but is even desirable. In this context, leptoquarks (LQs) are especially promising since they give tree-level effects in semi-leptonic B decays, but only loop-suppressed effects in other flavor observables that agree well with their SM predictions. Furthermore, LQs can lead to a m(t)/m(mu) enhanced effect in a(mu), allowing for an explanation even with (multi) TeV particles. However, a single scalar LQ representation cannot provide a common solution to all three anomalies. In this article we therefore consider a model in which we combine two scalar LQs: the SU(2)(L) singlet and the SU(2)(L) triplet. Within this model we compute all relevant 1-loop effects and perform a comprehensive phenomenological analysis, pointing out various interesting correlations among the observables. Furthermore, we identify benchmark points which are in fact able to explain all three anomalies (b -> c tau nu, b -> sl(+)l(-) and a(mu)), without violating bounds from other observables, and study their predictions for future measurements.