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28 March 2024
 
  » arxiv » 1412.1791

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Composite leptoquarks and anomalies in $B$-meson decays
Ben Gripaios ; Marco Nardecchia ; S. A. Renner ;
Date 4 Dec 2014
AbstractWe attempt to explain recent anomalies in semileptonic $B$ decays at LHCb via a composite Higgs model, in which both the Higgs and an $SU(2)_L$-triplet leptoquark arise as pseudo-Goldstone bosons of the strong dynamics. Fermion masses are assumed to be generated via the mechanism of partial compositeness, which largely determines the leptoquark couplings and implies non-universal lepton interactions. The latter are needed to accommodate tensions in the $b o s mu mu$ dataset and to be consistent with a discrepancy measured at LHCb in the ratio of $B^+ o K^+ mu^+ mu^-$ to $B^+ o K^+ e^+ e^-$ branching ratios. The data imply that the leptoquark should have a mass of around a TeV. We find that the model is not in conflict with current flavour or direct production bounds, but we identify a few observables for which the new physics contributions are close to current limits and where the leptoquark is likely to show up in future measurements. The leptoquark will be pair-produced at the LHC and decay predominantly to third-generation quarks and leptons, and LHC13 searches will provide further strong bounds.
Source arXiv, 1412.1791
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