Abstract
We examine various scenarios in which the Standard Model is extended by a light leptoquark state to solve for one or both B-physics anomalies, viz. \( {R}_{D^{\left(*\right)}}^{\exp }>{R}_{D^{\left(*\right)}}^{\mathrm{SM}} \) or/and \( {R}_{K^{\left(*\right)}}^{\exp }>{R}_{K^{\left(*\right)}}^{\mathrm{SM}} \). To do so we combine the constraints arising both from the low-energy observables and from direct searches at the LHC. We find that none of the scalar leptoquarks of mass mLQ ≃ 1 TeV can alone accommodate the above mentioned anomalies. The only single leptoquark scenario which can provide a viable solution for mLQ ≃ 1÷2 TeV is a vector leptoquark, known as U1, which we re-examine in its minimal form (letting only left-handed couplings to have non-zero values). We find that the limits deduced from direct searches are complementary to the low-energy physics constraints. In particular, we find a rather stable lower bound on the lepton flavor violating b → sℓ ±1 ℓ ∓2 modes, such as ℬ(B → Kμτ). Improving the experimental upper bound on ℬ(B → Kμτ) by two orders of magnitude could compromise the viability of the minimal U1 model as well.
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Angelescu, A., Bečirević, D., Faroughy, D.A. et al. Closing the window on single leptoquark solutions to the B-physics anomalies. J. High Energ. Phys. 2018, 183 (2018). https://doi.org/10.1007/JHEP10(2018)183
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DOI: https://doi.org/10.1007/JHEP10(2018)183