Observation of $h_c$ radiative decay $h_c\to \gamma {\eta }^{\prime }$ and evidence for $h_c\to \gamma \eta$

Abstract

A search for radiative decays of the $P$-wave spin singlet charmonium resonance $h_c$ is performed based on $4.48\times 10^8$ ${\psi }^{\prime }$ events collected with the BESIII detector operating at the BEPCII storage ring. Events of the reaction channels $h_c\to \gamma {\eta }^{\prime }$ and $\gamma \eta$ are observed with a statistical significance of $8.4\sigma$ and $4.0\sigma$, respectively, for the first time. The branching fractions of $h_c\to \gamma {\eta }^{\prime }$ and $h_c\to \gamma \eta$ are measured to be $\mathcal{B}(h_c\to \gamma {\eta }^{\prime })=(1.52\pm 0.27\pm 0.29)\times 10^{-3}$ and $\mathcal{B}(h_c\to \gamma \eta )=(4.7\pm 1.5\pm 1.4)\times 10^{-4}$, respectively, where the first errors are statistical and the second are systematic uncertainties.

arXiv comment7 pages, 2 figures

References in corpus (14)

• 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
• Higher Charmonia
• 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
• 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
• Study of $\psi (3686)\to {\pi }^0{h}_c,h_c\to \gamma {\eta }_c$ via ${\eta }_c$ exclusive decays
• Observation of $e^{+}{e}^{-}\to \omega {\chi }_{c1,2}$ near $\sqrt{s}$ = 4.42 and 4.6 GeV
• Determination of the number of ${\psi }^{\prime }$ event at BESIII
• Evidence for psi' decays into gamma pi^0 and gamma eta
• Evidence for Decays of h_c to Multi-Pion Final States

Cited by in corpus (10)

• Observation of $\psi (3686)\to e^{+}{e}^{-}{\chi }_{cJ}$ and ${\chi }_{cJ}\to e^{+}{e}^{-}J/\psi$
• Search for new decay modes of the ${\psi }_2(3823)$ and the process $e^{+}{e}^{-}\to {\pi }^0{\pi }^0{\psi }_2(3823)$
• Revisiting the $P$-wave charmonium radiative decays $h_c\to \gamma {\eta }^{(\prime )}$ with relativistic corrections
• Measurement of branching fractions for $\psi (3686)\to \gamma {\eta }^{\prime },\gamma \eta$ and $\gamma {\pi }^0$
• Study of electromagnetic Dalitz decays ${\chi }_{cJ}\to {\mu }^{+}{\mu }^{-}J/\psi$
• Radiative decays of $h_c$ to the light mesons ${\eta }^{(\prime )}$: A perturbative QCD calculation
• Predictions for $h_c$ and $h_b$ production at the LHC
• Radiative $h_{c/b}$ decays to $\eta$ or ${\eta }^{\prime }$
• QCD analysis of the $P$-wave charmonium electromagnetic Dalitz decays $h_c\to {\eta }^{(\prime )}{\ell }^{+}{\ell }^{-}$
• Observation of Charmonium $h_c$ Radiative Decays to Multiple Light Hadrons and the Tensor State $f_2(1270)$