Aug 8 – 13, 2022
Hörsaalzentrum Poppelsdorf
Europe/Berlin timezone

Structure-dependent form factors in radiative leptonic decays with Domain Wall fermions

Aug 8, 2022, 5:30 PM
CP1-HSZ/1.002 (CP1-HSZ) - HS6 (CP1-HSZ)

CP1-HSZ/1.002 (CP1-HSZ) - HS6


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Oral Presentation Weak Decays and Matrix Elements Weak Decays and Matrix Elements


Davide Giusti (Universität Regensburg)


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, using the Domain Wall formulation of lattice fermions.
With moderate statistics, thanks to the use of a sine-cardinal-reconstruction technique and improved estimators, we are able to provide rather precise, first-principles results for the form factors in the full kinematical (photon-energy) range for both light and heavy mesons.

Primary authors

Davide Giusti (Universität Regensburg) Christopher Francis Kane (University of Arizona) Christoph Lehner (Universität Regensburg) Stefan Meinel (University of Arizona) Amarjit Soni (Brookhaven National Laboratory)

Presentation materials