Radiative Semileptonic Decays of Beautiful Hadrons

TL;DR

This paper predicts hadronic matrix elements for radiative semileptonic decays of heavy hadrons using HQET, aiding future experiments at Belle II and LHCb.

Contribution

It provides a systematic derivation of form factors constrained by HQET symmetries, including soft and sub-leading corrections, for specific heavy hadron transitions.

Findings

Form factors are fully determined by Isgur-Wise functions and magnetic moments in certain regions.

Symmetries of HQET significantly reduce the number of independent form factors.

Higher order corrections are briefly analyzed.

Abstract

We derive predictions for the hadronic matrix elements of radiative semileptonic decays of beautiful hadrons within Heavy Quark Effective Theory (HQET), relevant for future measurements at Belle II and LHCb. Our study considers Lambda(b) -> Lambda(c), Lambda(*)(c1) and B -> D(*), D** transitions. The symmetries of HQET highly constrain the number of structure-dependent form factors in all cases. In the soft and sub-leading soft regions, all the form factors are fully determined in terms of non-radiative Isgur-Wise functions and the magnetic dipole moments of the heavy hadrons. The structure of higher order corrections is also briefly discussed.