Composite leptoquarks and anomalies in B-meson decays

By B. Gripaios, Marco Nardecchia, S. Renner. 2014

297 citations recorded by the source corpus.

A bstractWe 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 → sμμ dataset and to be consistent with a discrepancy measured at LHCb in the ratio of B+ → K+μ+μ− to B+ → 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.

Subfields: Artificial Intelligence, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/790cc2eb55d72e459baa01b31c2b035d8cbbb8ef

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Citations in the corpus

What is the scale of new physics behind the B-flavour anomalies? (2017, background): “Using the results of [48] we obtainMS1 > 570 GeV, which is still compatible with the unitarity bound in Table 5.”
Lepton flavor non-universality in B-meson decays from a U(2) flavor model (2015, background): “The upper bounds are summarized in the table 4, adapted from the case of composite leptoquarks [28].”
Patterns of New Physics in b → sℓ+ℓ− transitions in the light of recent data (2017, unknown): “More specifically, for the angular observables in B → K?µ+µ−, B → K?e+e− and Bs → φµ+µ−, we use the optimised observables P (′) i obtained from LHCb’s likelihood fit [15].”
Flavour anomalies after the RK∗ measurement (2017, background): “In [54] the LQ has been identified as a pseudoGoldstone boson associated to the breaking of a global symmetry of a new strongly coupled sector.”
Opportunities in Flavour Physics at the HL-LHC and HE-LHC (2018, background): “Both scalar and vector leptoquarks could arise, for example, in composite models [957, 958].”
Lepton universality violation with lepton flavor conservation in B-meson decays (2015, background): “Note that the effects of the leptoquark models in flavor observables or RK have been addressed earlier in the literature [31, 43–50].”