New measurements of the resonance parameters of the χc0(13P0) state of charmonium
- S. Bagnasco
- W. Baldini
- D. Bettoni
- G. Borreani
- A. Buzzo
- R. Calabrese
- R. Cester
- G. Cibinetto
- P. Dalpiaz
- G. Garzoglio
- K. Gollwitzer
- M. Graham
- M. Hu
- D. Joffe
- J. Kasper
- G. Lasio
- E. Luppi
- M. Macrı̀
- M. Mandelkern
- F. Marchetto
- E. Menichetti
- Z. Metreveli
- R. Mussa
- M. Negrini
- M. Obertino
- N. Pastrone
- S. Pordes
- E. Robutti
- W. Roethel
- J. Rosen
- P. Rumerio
- R. Rusack
- J. Schultz
- S. H. Seo
- K. K. Seth
- G. Stancari
- M. Stancari
- A. Tomaradze
- T. Vidnovic
- S. Werkema
- P. Zweber
- LO VETERE, MAURIZIO
- MARINELLI, MAURO
- PALLAVICINI, MARCO
- PATRIGNANI, CLAUDIA
- SANTRONI, ALBERTO
DOIAbstract
The resonance parameters of the χc0, the 13 P0 state of charmonium, have been measured at the Fermilab Antiproton Accumulator in the reaction p¯p→χc0→γ J/ψ →γ (e+e−). A large data sample collected during the year 2000 run yields the results: M(χc0) = 3415.4±0.4±0.2MeV/c2, Γ (χc0) = 9.8±1.0±0.1MeV, B(χc0→ ¯pp)×B(χc0→γJ/ψ)×B(J/ψ → (e+−)) = (1.61 ± 0.11 ± 0.08) × 10−7. Taking B(χc0 → γJ/ψ) and B(J/ψ → e+e−) from the literature, we obtain B(χc0 → ¯pp) = (4.1 ± 0.3+1.6−0.9) × 10−4 and Γ (χc0 → ¯pp) = (4.0 ± 0.4+1.6−0.9) ke
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