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

*Corresponding author for this work

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

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Nuclear and High Energy Physics


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