Explaining the LHC flavour anomalies

Abstract

The LHC observed deviations from the Standard Model (SM) in the flavour sector: LHCb found a $4.3\sigma$ discrepancy compared to the SM in $b\to s\mu \mu$ transitions and CMS reported a non-zero measurement of $h\to \mu \tau$ with a significance of $2.4\sigma$. Here we discuss how these deviations from the SM can be explained, focusing on two models with gauged $L_{\mu }-L_{\tau }$ symmetry. The first model contains two scalar doublets and vector-like quarks while the second one employs three scalar doublets but does not require vector-like fermions. In both models, interesting correlations between $b\to s\mu \mu$ transitions, $h\to \mu \tau$, and $\tau \to 3\mu$ arise.

Comments: 6 pages, 2 figures, proceedings for Moriond EW 2015 and Moriond QCD 2015