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Structure-dependent QED in $B^- \to \ell^- \bar ν(γ)$ (2404.07648v1)

Published 11 Apr 2024 in hep-ph, hep-ex, and hep-lat

Abstract: Based on explicitly gauge invariant interpolating operators we compute complete next-leading order QED-corrections for leptonic decays. These are sizeable since the helicity-suppression in V-A interactions allows for structure-dependent collinear logs. We have explicitly checked that these logs are absent for helicity-unsuppressed Yukawa-type transitions. Based on $B \to \gamma$ form factors we present the rates for $B- \to (\mu-,\tau-) \bar \nu (\gamma)$ in differential and integrated form as a function of the photon energy cut-off $E_\gamma{\text{cut}}$. The effect of the virtual structure-dependent corrections are approximately $+5\%$ and $+3\%$ for the $\mu$- and $\tau$-channel respectively. The structure dependence of the real radiation exceeds that of the virtual one for $E_\gamma{\text{cut}}|_{\mu} > 0.18(3)$ GeV and is subdominant for the tau channel even when fully inclusive.

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