A general Wilson-coefficient fit to B->D(*)tau nu data with scale-and-power parametrization gives M_NP <~ 27 TeV and shows negative P_tau(D) occurs only for CVL+CSR or CVL+CSL+CT operators.
b → clν decays at LHCb
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New physics effects on $B\to D^{(*)}\tau\nu$ decays
A general Wilson-coefficient fit to B->D(*)tau nu data with scale-and-power parametrization gives M_NP <~ 27 TeV and shows negative P_tau(D) occurs only for CVL+CSR or CVL+CSL+CT operators.