The annihilation decay B_c \to eta' l \nu

TL;DR

This paper studies the semileptonic annihilation decay of B_c mesons into eta' and leptons within QCD, estimating its branching ratio and momentum distribution, suggesting it can be observed at CERN LHC.

Contribution

It provides the first QCD-based analysis of the B_c o eta' l u decay, including momentum distribution and branching ratio estimates.

Findings

Eta' momentum distribution peaks at small recoil due to loop effects.

Estimated branching ratio is 1.6×10^{-4} for muon and electron channels.

Decay is accessible at CERN LHC experiments.

Abstract

We first investigate the semileptonic annihilation decay B_c \to \eta' l\nu in QCD. We find that the $\eta'$ momentum distribution is peaked within its small recoil region due to the loop effects. The branching ratio is estimated to be $ Br(B_c \to \eta' l\nu)=1.6\times 10^{-4}$ for $l=\mu,e$, which is accessible at CERN LHC.