Update of hadronic decays of $J/\psi$ and $\psi (2S)$ though virtual photons

Abstract

The hadronic decay branching ratios of $J/\psi$ and $\psi (2S)$ through virtual photons, $B(J/\psi ,\psi (2S)\to {\gamma }^{\ast }\to \text{hadrons})$, are updated by using the latest published measurements of the $R$ value and the branching ratios of $J/\psi ,\psi (2S)\to l^{+}{l}^{-}$. Their respective precision increases by about 4 and 3 times.

3 pages, 1 figure

References in corpus (3)

• Measurements of the cross sections for $e^{+}{e}^{-}\to \mathrm{hadrons}$ at 3.650, 3.6648, 3.773 GeV and the branching fraction for $\psi (3770)\to \mathrm{non}-D\bar{D}$
• Measurements of the continuum $R_{\mathrm{uds}}$ and $R$ values in $e^{+}{e}^{-}$ annihilation in the energy region between 3.650 and 3.872 GeV
• Measurement of the Cross Section for $e^{+}{e}^{-}\to$ hadrons at Energies from 2.2324 to 3.6710 GeV