E835 at FNAL: Charmonium spectroscopy in p̄p annihilations

Claudia Patrignani, M. Andreotti, S. Bagnasco, W. Baldini, D. Bettoni, G. Borreani, A. Buzzo, R. Calabrese, R. Cester, G. Cibinetto, P. Dalpiaz, G. Garzoglio, K. E. Gollwitzer, M. Graham, M. Hu, D. Joffe, J. Kasper, G. Lasio, M. Lo Vetere, E. LuppiM. Macrì, M. Mandelkern, F. Marchetto, M. Marinelli, E. Menichetti, Z. Metreveli, R. Mussa, M. Negrini, M. M. Obertino, M. Pallavicini, N. Pastrone, T. K. Pedlar, S. Pordes, E. Robutti, W. Roethel, J. L. Rosen, P. Rumerio, R. Rusack, A. Santroni, J. Schultz, S. H. Seo, K. K. Seth, G. Stancari, M. Stancari, A. Tomaradze, I. Uman, T. Vidnovic, S. Werkema, P. Zweber

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


I present preliminary results on the search for hc in its ηcγ and J/ψπ0 decay modes. We observe an excess of ηcγ 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(br) < Γp̄pBηcγ < 12.8±4.8±4.5 (br) eV. We find no event excess within the search region in the J/ψπ0 mode.

Original languageEnglish (US)
Pages (from-to)98-103
Number of pages6
JournalNuclear Physics B - Proceedings Supplements
Issue number1-3 SPEC. ISS.
StatePublished - May 2005


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