# Search for Charmonium States Decaying to $J/\psi\gamma\gamma$ Using Initial-State Radiation Events

Abstract : We study the processes e+e- -> (J/psi gamma gamma) gamma and e+e- -> (J/psi pi- pi+) gamma where the hard photon radiated from an initial e+e- collision with center-of-mass (CM) energy near 10.58 GeV is detected. In the final state J/psi gamma gamma we consider J/psi pi0, J/psi eta, chi_{c1} gamma, and chi_{c2} gamma candidates. The invariant mass of the hadronic final state defines the effective e+e- CM energy in each event, so these data can be compared with direct e+e- measurements. We report 90% CL upper limits for the integrated cross section times branching fractions of the J/psi gamma gamma channels in the Y(4260) mass region.
Document type :
Conference papers

http://hal.in2p3.fr/in2p3-00116829
Contributor : Dominique Girod <>
Submitted on : Tuesday, November 28, 2006 - 11:38:43 AM
Last modification on : Saturday, May 22, 2021 - 3:33:40 AM

### Citation

B. Aubert, R. Barate, M. Bona, D. Boutigny, F. Couderc, et al.. Search for Charmonium States Decaying to $J/\psi\gamma\gamma$ Using Initial-State Radiation Events. 33rd International Conference on High-Energy Physics, ICHEP 06, Jul 2006, Moscou, Russia. ⟨in2p3-00116829⟩

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