Lepton energy moments in semileptonic charm decays

TL;DR

This paper investigates Weak Annihilation effects in semileptonic charm decays using lepton energy moments, finding no significant evidence and setting bounds relevant for B decays.

Contribution

It provides the first analysis of Weak Annihilation signals in inclusive semileptonic D decays using lepton energy moments and sets constraints on their impact.

Findings

No clear evidence of Weak Annihilation in data

Bounds on Weak Annihilation relevance in B decays

Lepton energy moments are sensitive probes

Abstract

We search for signals of Weak Annihilation in inclusive semileptonic D decays. We consider both the widths and the lepton energy moments, which are quite sensitive probes. Our analysis of Cleo data shows no clear evidence of Weak Annihilation, and allows us to put bounds on their relevance in charmless B semileptonic decays.