Theory HEP Seminar

B decay anomalies from nonabelian horizontal symmetry

Jim Cline

McGill

I consider a theory of flavor in which matter transforms under a local SU(3)_L x SU(3)_R flavor symmetry group, acting in the same way on quarks and leptons. It breaks to a U(1) subgroup whose associated Z' gauge boson can explain the observed anomalies in B → K l l decays. To satisfy ATLAS dilepton and perturbativity constraints, the Z' mass should be not far above 5 TeV, hence close to discovery at LHC. New contributions to B-B and K-K mixing are not much below current limits, and possibly also deviations in Z → ll decays, CKM unitarity, and lepton-flavor violating decays μ → 3e, τ → 3l.