E835 at FNAL: Charmonium Spectroscopy in p ¯ p Annihilations

• Published in: Nuclear physics. Section B, Proceedings supplement Vol. 142; pp. 98 - 103
• Main Authors: Patrignani, Claudia, Andreotti, M., Bagnasco, S., Baldini, W., Bettoni, D., Borreani, G., Buzzo, A., Calabrese, R., Cester, R., Cibinetto, G., Dalpiaz, P., Garzoglio, G., Gollwitzer, K.E., Graham, M., Hu, M., Joffe, D., Kasper, J., Lasio, G., Lo Vetere, M., Luppi, E., Macrì, M., Mandelkern, M., Marchetto, F., Marinelli, M., Menichetti, E., Metreveli, Z., Mussa, R., Negrini, M., Obertino, M.M., Pallavicini, M., Pastrone, N., Pedlar, T.K., Pordes, S., Robutti, E., Roethel, W., Rosen, J.L., Rumerio, P., Rusack, R., Santroni, A., Schultz, J., Seo, S.H., Seth, K.K., Stancari, G., Stancari, M., Tomaradze, A., Uman, I., Vidnovic, T., Werkema, S., Zweber, P.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 2005
• ISSN: 0920-5632; 1873-3832
• DOI: 10.1016/j.nuclphysbps.2005.01.017

I present preliminary results on the search for h c in its η c γ and J / ψ π 0 decay modes. We observe an excess of η c γ events near 3526 MeV that has a probability P ∼ 0.001 to arise from background fluctations. The resonance parameters are M = 3525.8 ± 0.2 ± 0.2 MeV , Γ ⩽ 1 MeV , and 10.6 ± 3.7 ± 3.4 ( b r ) < Γ p ¯ p B η c γ < 12.8 ± 4.8 ± 4.5 ( b r ) eV . We find no event excess within the search region in the J / ψ π 0 mode.