Abstract
In recent times, one of the strongest hints of Physics Beyond the Standard Model (BSM) has been the anomaly in the ratios RD and \( {R}_{D^{*}} \) measured in the charged current decays of B-mesons. In this work, we perform a comprehensive analysis of these decay modes, first in a model independent way and subsequently, in the context of composite Higgs models. We discuss in depth as to how linearly realised SU(2)L × U(1)Y symmetry imposes severe constraint on the various scenarios because of correlations with other ΔF = 1 processes and Z τ τ and Z ν ν couplings. In the composite Higgs paradigm with partial compositeness, we show that, irrespective of the flavour structure of the composite sector, constraints from ΔF = 2 processes bring the compositeness scale down to ∼ 650 GeV which is in tension with electroweak precision observables. In the presence of composite leptoquarks, the situation improves only marginally (a factor of \( \sqrt{2} \) in the compositeness scale), thus making the new states soon discoverable by direct searches at the LHC. We also comment on the possible explanation of the \( {R}_{K,{K}^{*}} \) anomalies within the composite Higgs framework.
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Azatov, A., Bardhan, D., Ghosh, D. et al. Anatomy of b → c τ ν anomalies. J. High Energ. Phys. 2018, 187 (2018). https://doi.org/10.1007/JHEP11(2018)187
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DOI: https://doi.org/10.1007/JHEP11(2018)187