Abstract
Decays of B mesons with leptons in the final state offer an interesting laboratory to search for possible effects of physics from beyond the Standard Model. In view of puzzling patterns in experimental data, the violation of lepton flavour universality is an interesting option. We present a strategy, utilising ratios of leptonic and semileptonic B decays, where the elements |V_{ub}| and |V_{cb}| of the Cabibbo–Kobayashi–Maskawa (CKM) matrix cancel, to constrain the short-distance coefficients of (pseudo)-scalar, vector and tensor operator contributions. The individual branching ratios allow us then to extract also the CKM matrix elements, even in the presence of new-physics contributions. Bounds on unmeasured leptonic and semileptonic decays offer important additional constraints. In our comprehensive analysis, we give also predictions for decays which have not yet been measured in a variety of scenarios.
Highlights
Introduction of new physics effectsIn this work, we will consider New Physics (NP) contributions arising at a high energy scale of μ = 1 TeV
Decays of B mesons with leptons in the final state offer an interesting laboratory to search for possible effects of physics from beyond the Standard Model
In view of this feature, we have proposed a strategy for the exclusive b → u νmodes in Ref. [21], introducing suitable ratios of leptonic and semileptonic modes of this decay class, where the Cabibbo– Kobayashi–Maskawa (CKM) factor |Vub| cancels
Summary
For NP analyses to constrain the corresponding shortdistance parameters, care is needed concerning the values of |Vub| and |Vcb| as their determinations may be affected by contributions from physics beyond the Standard Model In view of this feature, we have proposed a strategy for the exclusive b → u νmodes in Ref. [21], introducing suitable ratios of leptonic and semileptonic modes of this decay class, where the CKM factor |Vub| cancels Utilising these observables, we determined allowed regions for the short-distance coefficients of (pseudo)-scalar operators, arising from NP effects. The exclusive b → c νquark-level decays are discussed, giving a comprehensive picture of the constraints on the short-distance coefficients of the corresponding (pseudo)-scalar, vector and tensor operators following from the current experimental data. We collect details of the specific form factor parameterisations applied in our numerical analysis, and the various input parameters that are used in our calculations
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