Observation of ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}\ensuremath{\eta}{h}_{c}$ at center-of-mass energies from 4.085 to 4.600 GeV

Observation of $e^{+} e^{-} \to η h_{c}$ at center-of-mass energies from 4.085 to 4.600 GeV

M. Ablikim et al. (BESIII Collaboration)

Phys. Rev. D 96, 012001 – Published 10 July 2017

Abstract

We observe for the first time the process $e^{+} e^{-} \to η h_{c}$ with data collected by the BESIII experiment. Significant signals are observed at the center-of-mass energy $\sqrt{s} = 4.226 GeV$ , and the Born cross section is measured to be $(9. 5_{- 2.0}^{+ 2.2} \pm 2.7) pb$ . Evidence for $η h_{c}$ is observed at $\sqrt{s} = 4.358 GeV$ with a Born cross section of $(10. 0_{- 2.7}^{+ 3.1} \pm 2.6) pb$ , and upper limits on the production cross section at other center-of-mass energies between 4.085 and 4.600 GeV are determined.