On the Particle Data Group evaluation of Psi' and chi_c Branching Ratios

Abstract

I propose a new evaluation of ${\psi }^{\prime }(2S)$ and ${\chi }_c(1P)$ branching ratios which avoids the correlations affecting the current Particle Data Group evaluation. These correlations explain the apparent technique-dependent discrepancies between the available determinations of the $\mathcal{B}({\chi }_c(1P)\to p\bar{p})$ and $\Gamma ({\chi }_c(1P)\to \gamma \gamma )$ under the hypotesis that the current values of the ${\psi }^{\prime }(2S)\to {\chi }_c(1P)\gamma$ branching ratios are overestimated. In the process I also noticed that Particle Data Group has not restated many of the older measurements, when necessary, for the new value of $\mathcal{B}(J/\psi \to l^{+}{l}^{-})$, which significantly affects the evaluation of some relevant ${\psi }^{\prime }(2S)$ and ${\chi }_c(1P)$ exclusive branching ratios.

13 pages. Revised version. Submitted to Phys. Rev. D

References in corpus (1)

• On recent data of branching ratios for psi(2S)-->J/psi pi pi and psi(2S)-->J/psi eta

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