Adding a hard photon to the final state of a leptonic pseudoscalar-meson decay lifts the helicity suppression and can provide sensitivity to a larger set of operators in the weak effective Hamiltonian. Furthermore, radiative leptonic B decays at high photon energy are well suited to constrain the first inverse moment of the B-meson light-cone distribution amplitude, an important parameter in the theory of nonleptonic B decays. We demonstrate that the calculation of radiative leptonic decays is possible using Euclidean lattice QCD, and present preliminary numerical results for D+s → `+νγ and K− → `−νγ ¯.
|Original language||English (US)|
|Journal||Proceedings of Science|
|State||Published - 2019|
|Event||37th International Symposium on Lattice Field Theory, LATTICE 2019 - Wuhan, China|
Duration: Jun 16 2019 → Jun 22 2019
ASJC Scopus subject areas