${\eta }_c\to l^{+}{l}^{-}$ and ${\chi }_{c0}\to l^{+}{l}^{-}$ decays revisited

Abstract

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

Comments: 5 pages, 1 figure