Search for the ${\eta }_c(2S)/h_c\to p\bar{p}$ decays and measurements of the ${\chi }_{cJ}\to p\bar{p}$ branching fractions

Abstract

Using a sample of $1.06\times 10^8\psi (3686)$ events collected with the BESIII detector at BEPCII, the decays ${\eta }_c(2S)\to p\bar{p}$ and $h_c\to p\bar{p}$ are searched for, where ${\eta }_c(2S)$ and $h_c$ are reconstructed in the decay chains $\psi (3686)\to \gamma {\eta }_c(2S)$, ${\eta }_c(2S)\to p\bar{p}$ and $\psi (3686)\to {\pi }^0{h}_c$, $h_c\to p\bar{p}$, respectively. No significant signals are observed. The upper limits of the product branching fractions are determined to be $\mathcal{B}(\psi (3686)\to \gamma {\eta }_c(2S))\times \mathcal{B}({\eta }_c(2S)\to p\bar{p})<1.4\times 10^{-6}$ and $\mathcal{B}(\psi (3686)\to {\pi }^0{h}_c)\times \mathcal{B}(h_c\to p\bar{p})<1.3\times 10^{-7}$ at the 90% C.L.. The branching fractions for ${\chi }_{cJ}\to p\bar{p}$ $(J=0,1,2)$ are also measured to be $(24.5\pm 0.8\pm 1.3,8.6\pm 0.5\pm 0.5,8.4\pm 0.5\pm 0.5)\times 10^{-5}$, which are the world's most precise measurements.

References in corpus (2)

• Quarkonia and their transitions
• Further study of the helicity selection rule evading mechanism in ${\eta }_c$, ${\chi }_{c0}$ and $h_c$ decaying to baryon anti-baryon pairs

Cited by in corpus (8)

• Observation of ${\eta }_c(2S)\to p\bar{p}$ and search for $X(3872)\to p\bar{p}$ decays
• Phenomenological NLO analysis of eta(c) production at the LHC in the collider and fixed-target modes
• Measurement of higher-order multipole amplitudes in $\psi (3686)\to \gamma {\chi }_{c1,2}$ with ${\chi }_{c1,2}\to \gamma J/\psi$ and search for the transition ${\eta }_c(2S)\to \gamma J/\psi$
• Measurement of $\psi (3686)\to \Lambda \bar{\Lambda }\eta$ and $\psi (3686)\to \Lambda \bar{\Lambda }{\pi }^0$ decays
• First observation of the decay ${\chi }_{cJ}\to {\Sigma }^{+}\bar{p}{K}_S^0+c.c.(J=0,1,2)$
• Study of charmonium production using decays to hadronic final states with the LHCb experiment
• Observation of the decay $h_c\to 3({\pi }^{+}{\pi }^{-}){\pi }^0$
• Search for the weak decay $\psi (3686)\to {\Lambda }_c^{+}{\bar{\Sigma }}^{-}+c.c$