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 (5)

• Heavy quarkonium: progress, puzzles, and opportunities
• Charmonium
• Matching perturbative and Parton Shower corrections to Bhabha process at flavour factories
• Measurements of the braching fractions for psi(3770)--> D0D0-bar,D+D-,DD-bar$ and the resonance parameters of psi(3770) and psi(2S)
• 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

Cited by in corpus (3)

• 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