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2019

Revisiting the new-physics interpretation of the $b\to c\tau\nu$ data

Shi, Rui-Xiang, Geng, Li-Sheng, Grinstein, Benjamín et al.

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We revisit the status of the new-physics interpretations of the anomalies in semileptonic $B$ decays in light of the new data reported by Belle on the lepton-universality ratios $R_{D^{(*)}}$ using the semileptonic tag and on the longitudinal polarization of the $D^*$ in $B\to D^*\tau\nu$, $F_L^{D^*}$.

The preferred solutions involve new left-handed currents or tensor contributions.
Interpretations with pure right-handed currents are disfavored by the LHC data, while pure scalar models are disfavored by the upper limits derived either from the LHC or from the $B_c$ lifetime.
The observable $F_L^{D^*}$ also gives an important constraint leading to the exclusion of large regions of parameter space.

Revisiting the new-physics interpretation of the $b\to c\tau\nu$ data · Around

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