Under the minimally-broken U(2)_q × U(2)_ℓ flavor symmetry hypothesis, semileptonic B decay amplitudes are controlled by a few parameters, yielding testable correlations such as equal new-physics effects in b→u and b→c tauonic transitions.
The B -> pi tau nu decay in the context of the 2HDM type II
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In this manuscript the B -> pi tau nu decay is investigated in the context of the 2HDM type II extension of the SM. In particular, predictions for the ratio of semileptonic branching fractions from l = tau and l = electron, muon are produced and an exclusion based on the MSSM parameters tan beta and mH+ from a preliminary Belle measurement are reported. An alternative variable to the ratio of branching fractions that could offer increased sensitivity is discussed that could result in increased sensitivity to rule out contributions from additional scalar mediators.
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With or without U(2)? Probing non-standard flavor and helicity structures in semileptonic B decays
Under the minimally-broken U(2)_q × U(2)_ℓ flavor symmetry hypothesis, semileptonic B decay amplitudes are controlled by a few parameters, yielding testable correlations such as equal new-physics effects in b→u and b→c tauonic transitions.