Observation of a ${\ensuremath{\chi}}_{c2}^{\ensuremath{'}}$ Candidate in $\ensuremath{\gamma}\ensuremath{\gamma}\ensuremath{\rightarrow}D\overline{D}$ Production at Belle

Observation of a $χ_{c 2}^{'}$ Candidate in $γ γ \to D \bar{D}$ Production at Belle

S. Uehara et al. (Belle Collaboration)

Phys. Rev. Lett. 96, 082003 – Published 1 March 2006

Abstract

We report on a search for new resonant states in the process $γ γ \to D \bar{D}$ . A candidate $C$ -even charmonium state is observed in the vicinity of $3.93 GeV / c^{2}$ . The production rate and the angular distribution in the $γ γ$ center-of-mass frame suggest that this state is the previously unobserved $χ_{c 2}^{'}$ , the $2 {}^{3}P_{2}$ charmonium state.