Measurements of the branching fractions of the $P$-wave charmonium spin-singlet state $h_c{(}^1{P}_1)\to h^{+}{h}^{-}{\pi }^0/\eta$

Abstract

Based on $(2712.4\pm 14.3)\times 10^6$ $\psi (3686)$ events, we investigate four hadronic decay modes of the $P$-wave charmonium spin-singlet state $h_c{(}^1{P}_1)\to h^{+}{h}^{-}{\pi }^0/\eta$ ($h=\pi$ or $K$) via the process $\psi (3686)\to {\pi }^0{h}_c$ at BESIII. The $h_c\to {\pi }^{+}{\pi }^{-}{\pi }^0$ decay is observed with a significance of 9.6$\sigma$ after taking into account systematic uncertainties. Evidences for $h_c\to K^{+}{K}^{-}{\pi }^0$ and $h_c\to K^{+}{K}^{-}\eta$ are found with significances of $3.5\sigma$ and $3.3\sigma$, respectively, after considering the systematic uncertainties. The branching fractions of these decays are measured to be $\mathcal{B}(h_c\to {\pi }^{+}{\pi }^{-}{\pi }^0)=(1.36\pm 0.16\pm 0.14)\times 10^{-3}$, $\mathcal{B}(h_c\to K^{+}{K}^{-}{\pi }^0)=(3.26\pm 0.84\pm 0.36)\times 10^{-4}$, and $\mathcal{B}(h_c\to K^{+}{K}^{-}\eta )=(3.13\pm 1.08\pm 0.38)\times 10^{-4}$, where the first uncertainties are statistical and the second are systematic. No significant signal of $h_c\to {\pi }^{+}{\pi }^{-}\eta$ is found, and the upper limit of its decay branching fraction is determined to be $\mathcal{B}(h_c\to {\pi }^{+}{\pi }^{-}\eta )<4.0\times 10^{-4}$ at 90% confidence level.

arXiv comment9 pages, 7 figures

References in corpus (23)

• A Unified Approach to the Classical Statistical Analysis of Small Signals
• Design and Construction of the BESIII Detector
• The Precision Monte Carlo Event Generator KK For Two-Fermion Final States In e+e- Collisions
• PHOTOS Monte Carlo: a precision tool for QED corrections in Z and W decays
• Coherent Exclusive Exponentiation For Precision Monte Carlo Calculations
• Future Physics Programme of BESIII
• 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
• Study of ${\chi }_{cJ}$ radiative decays into a vector meson
• TopoAna: A generic tool for the event type analysis of inclusive Monte-Carlo samples in high energy physics experiments
• Observation of h_c(^1P_1) State of Charmonium
• Measurements of h_c(^1P_1) in psi' Decays
• Precision Measurement of the Mass of the h_c(1P1) State of Charmonium
• Cross section measurements of $e^{+}{e}^{-}\to \omega {\chi }_{c0}$ from $\sqrt{s}=$4.178 to 4.278 GeV
• Observation of the ^1P_1 State of Charmonium
• Determination of the number of $\psi (3686)$ events taken at BESIII
• S-D Mixing and Searching for the psi(1P1) State at the Beijing Electron-Positron Coolider
• Study of tracking efficiency and its systematic uncertainty from $J/\psi \to p\overline{p}{\pi }^{+}{\pi }^{-}$ at BESIII
• Combined estimation for multi-measurements of branching ratio
• Study of the $h_c$($1^1{P}_1$) meson via $\psi (2S)\to {\pi }^0{h}_c$ decays at BESIII
• First observations of $h_c\to$ hadrons
• Search for New Hadronic Decays of $h_c$ and Observation of $h_c\to K^{+}{K}^{-}{\pi }^{+}{\pi }^{-}{\pi }^0$
• Observation of the decay $h_c\to 3({\pi }^{+}{\pi }^{-}){\pi }^0$