Observation of Charmonium $h_c$ Radiative Decays to Multiple Light Hadrons and the Tensor State $f_2(1270)$

Abstract

Using $\psi (3686)\to {\pi }^0{h}_c$ decays from a data sample of $(27.12\pm 0.14)\times 10^8$ $\psi (3686)$ events collected by the BESIII detector at the BEPCII collider, $h_c$ radiative decays to $\gamma {\pi }^{+}{\pi }^{-},\gamma {\pi }^{+}{\pi }^{-}\eta ,\gamma 2({\pi }^{+}{\pi }^{-})$, and $\gamma p\bar{p}$ are observed for the first time, each with a significance greater than $5\sigma$. The corresponding branching fractions are measured. Furthermore, intermediate states below 2.8 GeV/$c^2$ are investigated, leading to the first observation of the decay process of $h_c\to \gamma f_2(1270)\to \gamma {\pi }^{+}{\pi }^{-}$ with a significance of $5.5\sigma$. This observation represents the first instance of $h_c$ radiative decay to a tensor state.

References in corpus (12)

• The ρρinteraction in the hidden gauge formalism and the f_0(1370) and f_2(1270) resonances
• Observation of an isoscalar resonance with exotic $J^{PC}=1^{-+}$ quantum numbers in $J/\psi \to \gamma \eta {\eta }^{\prime }$
• Scalar isoscalar mesons and the scalar glueball from radiative $J/\psi$ decays
• Determination of the number of $\psi (3686)$ events taken at BESIII
• A Comprehensive Study of the Radiative Decays of $J/\psi$ and $\psi (2S)$ to Pseudoscalar Meson Pairs, and Search for Glueballs
• Observation of a state $X(2600)$ in the ${\pi }^{+}{\pi }^{-}{\eta }^{\prime }$ system in the process $J/\psi \to \gamma {\pi }^{+}{\pi }^{-}{\eta }^{\prime }$
• Measurement of $\psip$ Radiative Decays
• Radiative decays of charmonium into light mesons
• Study of the $h_c$($1^1{P}_1$) meson via $\psi (2S)\to {\pi }^0{h}_c$ decays at BESIII
• Observation of $\psi (3686)\to p\bar{p}{\eta }^{\prime }$ and improved measurement of $J/\psi \to p\bar{p}{\eta }^{\prime }$
• Improved measurement of the branching fraction of $h_c\to \gamma {\eta }^{\prime }/\eta$ and search for $h_c\to \gamma {\pi }^0$
• Search for New Hadronic Decays of $h_c$ and Observation of $h_c\to K^{+}{K}^{-}{\pi }^{+}{\pi }^{-}{\pi }^0$