Measurement of $\mathcal{B}(\psi (3770)\to \gamma {\chi }_{c1})$ and search for $\psi (3770)\to \gamma {\chi }_{c2}$

Abstract

We report a measurement of the branching fraction of $\psi (3770)\to \gamma {\chi }_{c1}$ and search for the transition $\psi (3770)\to \gamma {\chi }_{c2}$ based on 2.92~fb${}^{-1}$ of $e^{+}{e}^{-}$ data accumulated at $\sqrt{s}=3.773$~GeV with the BESIII detector at the BEPCII collider. The measured branching fraction of $\psi (3770)\to \gamma {\chi }_{c1}$ is $\mathcal{B}(\psi (3770)\to \gamma {\chi }_{c1})=(2.48\pm 0.15\pm 0.23)\times 10^{-3}$, which is the most precise measurement to date. The upper limit on the branching fraction of $\psi (3770)\to \gamma {\chi }_{c2}$ at a $90\%$ confidence level is $\mathcal{B}(\psi (3770)\to \gamma {\chi }_{c2})<0.64\times 10^{-3}$. The corresponding partial widths are $\Gamma (\psi (3770)\to \gamma {\chi }_{c1})=(67.5\pm 4.1\pm 6.7)$~keV and $\Gamma (\psi (3770)\to \gamma {\chi }_{c2})<17.4$~keV.

References in corpus (18)

• Heavy quarkonium: progress, puzzles, and opportunities
• Design and Construction of the BESIII Detector
• The Precision Monte Carlo Event Generator KK For Two-Fermion Final States In e+e- Collisions
• Higher Charmonia
• Charmonium
• Charmonium levels near threshold and the narrow state $X(3872) \to π^{+}π^{-}\jpsi$
• Matching perturbative and Parton Shower corrections to Bhabha process at flavour factories
• Suppressed decay into open charm for the Y(4260) being an hybrid
• Branching fraction measurements of χ_{c0} and χ_{c2} to π^0π^0 and ηη
• Charmless Final States and S--D-wave mixing in the ${\psi }^{\prime \prime }$
• Measurements of the braching fractions for psi(3770)--> D0D0-bar,D+D-,DD-bar$ and the resonance parameters of psi(3770) and psi(2S)
• Observation of psi(3770)--> pi pi J/psi and Measurement of Gamma_{ee}[psi(2S)]
• Evidence of psi(3770) non-DD-bar Decay to J/psi pi+pi-
• Decay of the psi(3770) to Light Hadrons
• Observation of psi(3770) --> gamma chi_c0
• First Observation of psi(3770) --> gamma chi_{c1} --> gamma gamma J/psi
• Precison Measurements of the Mass, the Widths of $\psi (3770)$ Resonance and the Cross Section $\sigma [e^{+}{e}^{-}\to \psi (3770)]$ at $E_{\mathrm{cm}}=3.7724$ GeV
• Measurements of the observed cross sections for $e^{+}{e}^{-}\to$ light hadrons at $\sqrt{s}=$ 3.773 and 3.650 GeV

Cited by in corpus (5)

• Charmonium spectrum and their electromagnetic transitions with higher multipole contributions
• Improved measurements of two-photon widths of the ${\chi }_{cJ}$ states and helicity analysis for ${\chi }_{c2}\to \gamma \gamma$
• Observation of di-structures in $e^{+}{e}^{-}\to J/\psi \mathrm{X}$ at center-of-mass energies around 3.773 GeV
• Measurement of the branching fraction for $\psi (3770)\to \gamma {\chi }_{c0}$
• Studies of Charmonium at BESIII