Observation of $\psi (3686)\to p\bar{p}{\eta }^{\prime }$ and improved measurement of $J/\psi \to p\bar{p}{\eta }^{\prime }$

Abstract

We observe the process $\psi (3686)\to p\bar{p}{\eta }^{\prime }$ for the first time, with a statistical significance higher than 10$\sigma$, and measure the branching fraction of $J/\psi \to p\bar{p}{\eta }^{\prime }$ with an improved accuracy compared to earlier studies. The measurements are based on $4.48\times 10^8$ $\psi (3686)$ and $1.31\times 10^9$ $J/\psi$ events collected by the BESIII detector operating at the BEPCII. The branching fractions are determined to be $B(\psi (3686)\to p\bar{p}{\eta }^{\prime })=(1.10\pm 0.10\pm 0.08)\times 10^{-5}$ and $B(J/\psi \to p\bar{p}{\eta }^{\prime })=(1.26\pm 0.02\pm 0.07)\times 10^{-4}$, where the first uncertainties are statistical and the second ones systematic. Additionally, the $\eta -{\eta }^{\prime }$ mixing angle is determined to be $-24^{\circ }\pm 11^{\circ }$ based on $\psi (3686)\to p\bar{p}{\eta }^{\prime }$, and $-24^{\circ }\pm 9^{\circ }$ based on $J/\psi \to p\bar{p}{\eta }^{\prime }$, respectively.

arXiv comment9 pages, 20 figures

References in corpus (17)

• Design and Construction of the BESIII Detector
• The Precision Monte Carlo Event Generator KK For Two-Fermion Final States In e+e- Collisions
• Coherent Exclusive Exponentiation For Precision Monte Carlo Calculations
• Search for hadronic transition ${\chi }_{cJ}\to {\eta }_c{\pi }^{+}{\pi }^{-}$ and observation of ${\chi }_{cJ}\to K\bar{K}\pi \pi \pi$
• Branching fraction measurements of χ_{c0} and χ_{c2} to π^0π^0 and ηη
• Determination of the number of $\psi (3686)$ events at BESIII
• Determination of the number of $J/\psi$ events with inclusive $J/\psi$ decays
• Study of $\psi (3686)\to {\pi }^0{h}_c,h_c\to \gamma {\eta }_c$ via ${\eta }_c$ exclusive decays
• Precision Study of ${\eta }^{\prime }\to \gamma {\pi }^{+}{\pi }^{-}$ Decay Dynamics
• Evidence for psi' decays into gamma pi^0 and gamma eta
• Nucleon pole contributions in $J/\psi \to N\bar{N}\pi$, $p\bar{p}\eta$, $p\bar{p}{\eta }^{\prime }$ and $p\bar{p}\omega$ decays
• Determination of the relative phase in ψ' and J/ψ decays into baryon and antibaryon
• Observation of $\psi (3686)\to n\bar{n}$ and improved measurement of $\psi (3686)\to p\bar{p}$
• Observation of ${\eta }_c$ decay into ${\Sigma }^{+}{\bar{\Sigma }}^{-}$ and ${\Xi }^{-}{\bar{\Xi }}^{+}$ final states
• The nucleon resonances in the $J/\psi \to p\bar{p}{\eta }^{\prime }$ decay
• Measurement of the Branching Fraction for J/ψ-> p \bar{p}ηand p \bar{p} η^{'}
• Measurement of the branching fraction for $\psi (3686)\to \omega K^{+}{K}^{-}$

Cited by in corpus (4)

• First observation of the decay ${\chi }_{cJ}\to {\Sigma }^{+}\bar{p}{K}_S^0+c.c.(J=0,1,2)$
• Observation of the $J/\psi$ and $\psi (3686)$ decays into $\eta {\Sigma }^{+}{\bar{\Sigma }}^{-}$
• Observation of $\psi (3686)\to p\bar{p}\varphi$
• Observation of Charmonium $h_c$ Radiative Decays to Multiple Light Hadrons and the Tensor State $f_2(1270)$