Tau polarization in baryonic semileptonic decays supplies the leading sensitivity to lift EFT degeneracies unresolved by meson measurements in b to c tau nu transitions.
Renormalization-group evolution of new physics contributions to (semi)leptonic meson decays
3 Pith papers cite this work. Polarity classification is still indexing.
3
Pith papers citing it
abstract
We study the renormalization group evolution (RGE) of new physics contributions to (semi)leptonic charged-current meson decays, focusing on operators involving a chirality flip at the quark level. We calculate their evolution under electroweak and electromagnetic interactions, including also the three-loop QCD running and provide numerical formulas that allow us to connect the values of the corresponding Wilson coefficients from scales at the TeV to the low-energy scales. The large mixing of the tensor operator into the (pseudo)scalar ones has important phenomenological implications, such as the RGE of new physics bounds obtained from light quark decays or in $b\to c\ell\nu$ transitions. For instance, we study scenarios involving tensor effective operators, which have been proposed in the literature to address the $B$-decay anomalies, most notably those concerning the $R_{D^{(*)}}$ ratios. We conclude that the loop effects are important and should be taken into account in the analysis of these processes, especially if the operators are generated at an energy scale of $\sim 1$ TeV or higher.
fields
hep-ph 3years
2026 3representative citing papers
The authors evaluate form factors via HQET and z-expansion for B_s to D_s** l nu decays, predict SM LFU ratios R_Ds0*=0.158(20) etc., and analyze NP effects in WET/SMEFT/2HDM showing scalar/tensor operators produce >2 sigma deviations in some observables.
citing papers explorer
-
Lifting Effective-Field-Theory Degeneracies in Semileptonic Heavy-Baryon Decays
Tau polarization in baryonic semileptonic decays supplies the leading sensitivity to lift EFT degeneracies unresolved by meson measurements in b to c tau nu transitions.
-
A Comprehensive Analysis of $B_s \to D_s^{**}\ell\nu_\ell$ Decays Within and Beyond the Standard Model
The authors evaluate form factors via HQET and z-expansion for B_s to D_s** l nu decays, predict SM LFU ratios R_Ds0*=0.158(20) etc., and analyze NP effects in WET/SMEFT/2HDM showing scalar/tensor operators produce >2 sigma deviations in some observables.
- EFT for Neutrino Oscillations: Theory Developments and Application to JUNO