TY  - CONF
AU  - Giusti, Davide
TI  - Study of radiative leptonic decays from first principles
PB  - CERN
M1  - FZJ-2024-06523
PY  - 2024
AB  - In the region of hard photon energies, radiative leptonic decays represent important probes of the internal structure of hadrons. Moreover, radiative decays can provide independent determinations of Cabibbo-Kobayashi-Maskawa matrix elements with respect to purely leptonic or semileptonic channels. Prospects for a precise determination of leptonic decay rates with emission of a hard photon are particularly interesting, especially for the decays of heavy mesons for which currently only model-dependent predictions, based on QCD factorization and sum rules, are available to compare with existing experimental data. We present a non-perturbative lattice calculation of the structure-dependent form factors which contribute to the amplitudes for the radiative decays $H \to \ell \nu_\ell \gamma$, where H is a charged pseudoscalar meson. With moderate statistics, thanks to the use of improved estimators, we are able to provide rather precise, first-principles results for the form factors in the full kinematical (photon-energy) range. Our continuum-extrapolated lattice determinations may then be employed to compute the differential decay rate and the corresponding branching fraction and make comparisons with existing experimental data.
T2  - Lattice Coffee Seminar
CY  - ,  (Switzerland)
M2  - , Switzerland
LB  - PUB:(DE-HGF)31
UR  - https://juser.fz-juelich.de/record/1033651
ER  -