Observation of ${\chi }_{cJ}(J=0,1,2)\to p\bar{p}\eta \eta$

Abstract

Using $(2712.4\pm 14.3)\times 10^6$ $\psi (3686)$ events collected by the BESIII detector operating at the BEPCII storage ring, the decays ${\chi }_{cJ}(J=0,1,2)\to p\bar{p}\eta \eta$ are observed for the first time through the radiative transition $\psi (3686)\to \gamma {\chi }_{cJ}$. The statistical significances for ${\chi }_{cJ}$ signals are all larger than 5$\sigma$. The branching fractions of ${\chi }_{c0,1,2}\to p\bar{p}\eta \eta$ are determined to be $(5.75\pm 0.59\pm 0.42)\times 10^{-5}$, $(1.40\pm 0.33\pm 0.17)\times 10^{-5}$, and $(2.64\pm 0.40\pm 0.27)\times 10^{-5}$, respectively, where the first uncertainties are statistical and the second systematic. No evident resonant structures are found in the $p\bar{p}$ and $p\eta /\bar{p}\eta$ systems.

arXiv comment17 pages, 16 figures

References in corpus (12)

• The Precision Monte Carlo Event Generator KK For Two-Fermion Final States In e+e- Collisions
• Coherent Exclusive Exponentiation For Precision Monte Carlo Calculations
• Method for detector description transformation to Unity and application in BESIII
• Baryon Resonance Extraction from piN Data using a Unitary Multichannel Model
• TopoAna: A generic tool for the event type analysis of inclusive Monte-Carlo samples in high energy physics experiments
• Near threshold enhancement of the ppbar mass spectrum in J/Psi decay
• A New State of Baryonium
• Baryonium with a phenomenological skyrmion-type potential
• Study of tracking efficiency and its systematic uncertainty from $J/\psi \to p\overline{p}{\pi }^{+}{\pi }^{-}$ at BESIII
• Measurement of B(J/psi->eta_c gamma) at KEDR
• Hints for the existence of hexaquark states in the baryon-antibaryon sector
• Precise determination of the eta_c mass and width in the radiative J/Psi -> eta_c gamma decay