Measurement of the resonance parameters of the X1 (13P1) and X2 (13P2) states of charmonium formed in antiproton-proton annihilations

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. Luppi, M. MacrìMark Mandelkern, F. Marchetto, M. Marinelli, E. Menichetti, Z. Metreveli, R. Mussa, M. Negrini, M. M. Obertino, M. Pallavicini, N. Pastrone, C. Patrignani, S. Pordes, E. Robutti, W. Roethel, J. Rosen, P. Rumerio, R. W. 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

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Abstract

We have studied the 3PJc) states of charmonium in formation by antiproton-proton annihilations in experiment E835 at the Fermi lab Antiproton Source. We report new measurements of the mass, width, and B(χcJ → p̄p) Γ (χcJ → J/ψ + anything) for the χc1 and χc2 by means of the inclusive reaction p̄p → χcJ → J/ψ + anything → (e+e-) + anything. Using the subsample of events where χcJ → γ + (e+e-) is fully reconstructed, we derive B(χcJ → p̄p) Γ (χcJ → J/ψ + γ). We summarize the results of the E760 (updated) and E835 measurements of mass, width and B (χcJ → p̄p) Γ (χcJ → J/ψ + γ) (J = 0, 1, 2) and discuss the significance of these measurements.

Original languageEnglish (US)
Pages (from-to)34-47
Number of pages14
JournalNuclear Physics B
Volume717
Issue number1-2
DOIs
StatePublished - Jun 20 2005

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    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., ... Zweber, P. (2005). Measurement of the resonance parameters of the X1 (13P1) and X2 (13P2) states of charmonium formed in antiproton-proton annihilations. Nuclear Physics B, 717(1-2), 34-47. https://doi.org/10.1016/j.nuclphysb.2005.03.042