Study of the χc0(13 P0) state of charmonium formed in pp anihilations

M. Ambrogiani, S. Argirò, S. Bagnasco, W. Baldini, D. Bettoni, G. Borreani, A. Buzzo, R. Calabrese, R. Cester, P. Dalpiaz, X. Fan, G. Garzoglio, K. E. Gollwitzer, A. Hahn, S. Jin, J. Kasper, G. Lasio, M. Lo Vetere, E. Luppi, P. MaasM. Macrì, M. Mandelkern, F. Marchetto, M. Marinelli, W. Marsh, M. Martini, E. Menichetti, R. Mussa, M. M. Obertino, M. Pallavicini, N. Pastrone, C. Patrignani, T. K. Pedlar, J. Peoples, S. Pordes, E. Robutti, J. Rosen, P. Rumerio, A. Santroni, M. Savriè, J. Schultz, K. K. Seth, G. Stancari, M. Stancari, J. Streets, A. Tomaradze, S. Werkema, G. Zioulas

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25 Scopus citations


The resonance parameters of χ c0, the 31P0 resonance of charmonium, have been measured at the Fermilab Antiproton Accumulator by means of the reaction pp → χc0 → γ J/ψ → γ (e+, e-. The results are M(ψc0) = 3417.4+1.8-1.9 ± 0.2 Me V/c2, Τ(03C8;c0 → pp) × B(ψc0 → J/Ψ γ) × B(J/ψ → e+e) = 2.89+ 0.67- 0.53 ± 0.14 eV. Using known branching ratios we also obtain Τ (Χc0 → pp) = 8.0+1.9+3.5-1.5-1.9keV. These results are discussed in relation to the other ΧCJ states and to theoretical predictions.

Original languageEnglish (US)
Pages (from-to)2902-2905
Number of pages4
JournalPhysical review letters
Issue number15
StatePublished - 1999

ASJC Scopus subject areas

  • General Physics and Astronomy


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