Violation of lepton flavour universality in composite Higgs models

• DOI: 10.1016/j.physletb.2015.05.063
• Publication Date: 2015-05-29T13:07:57Z
• Authors: Christoph Niehoff; Peter Stangl; David M. Straub
• Keywords: Flavour

We investigate whether the 2.6σ deviation from lepton flavour universality in B+→K+ℓ+ℓ− decays recently observed at LHCb experiment can be explained minimal composite Higgs models. show that a visible departure is indeed possible if left-handed muons have sizable degree of compositeness. Constraints Z-pole observables are avoided by custodial protection muon coupling.