Search for Sub-threshold Photoproduction of J/Psi Mesons

Bosted, P.; Dunne, J.; Lee, C. A.; Junnarkar, P.; Arrington, J.; Asaturyan, R.; Benmokhtar, F.; Christy, M. E.; Chudakov, E.; Clasie, B.; Connell, S. H.; Dalton, M. M.; Daniel, A.; Day, D.; Dutta, D.; Ent, R.; Fomin, N.; Gaskell, D.; Horn, T.; Kalantarians, N.; Keppel, C. E.; Meekins, D. G.; Mkrtchyan, H.; Navasardyan, T.; Roche, J.; Rodriguez, V. M.; Kiselev, D.; Seely, J.; Slifer, K.; Strikman, M.; Tajima, S.; Testa, G.; Trojer, Roman; Wesselmann, F. R.; Wood, S. A.; Zheng, X. C.

Search for Sub-threshold Photoproduction of J/Psi Mesons

Authors

Description

A search was made for sub-threshold $J/ψ$ production from a carbon target using a mixed real and quasi-real Bremsstrahlung photon beam with an endpoint energy of 5.76 GeV. No events were observed, which is consistent with predictions assuming quasi-free production. The results place limits on exotic mechanisms that strongly enhance quasi-free production.
19 pages, 7 figures, to be submitted to Phys. Rev. C