$\eta_{c}\rightarrow l^{+}l^{-}$ and $\chi_{c0}\rightarrow l^{+}l^{-}$ decays revisited

TL;DR

This paper recalculates the decay widths of $ ext{eta}_c$ and $ ext{chi}_c0$ into lepton pairs using NRQCD, providing updated branching fractions within a leading-order approximation.

Contribution

It offers a new calculation of these decay widths within the NRQCD framework, updating previous estimates with leading-order results.

Findings

Numerical branching fractions for $ ext{eta}_c$ and $ ext{chi}_c0$ decays are provided.

The decay widths are computed within a leading-order NRQCD approximation.

Results offer updated theoretical predictions for these rare decays.

Abstract

We present a calculation of $\eta_{c}\rightarrow l^{+}l^{-}$ and $\chi_{c0}\rightarrow l^{+}l^{-}$ decay widths. The amplitudes are computed within leading-order approximation using NRQCD framework. Numerical results for the branchings fractions are presented.