We report on χc1 and χc2 production in the Feynman-x range 0.1 < xF < 0.8 in 515 GeV/c π- Be collisions. The χc states are observed via their radiative decays into J/Ψ's. The resulting photons are detected either as showers in the electromagnetic calorimeter or after conversion in the target as e+ e- pairs in the tracking system. The fraction of J/Ψ production due to χc1 and χc2 decays is 0.443 ± 0.041 ± 0.035. The ratio of the χc1 to χc2 cross section is 0.57 ± 0.18 ± 0.06. Our results on J/Ψ, Ψ(2S), and χc production indicate that 0.454 ± 0.044 ± 0.042 of J/Ψ's are produced directly.
|Original language||English (US)|
|Number of pages||4|
|Journal||Physical Review Letters|
|State||Published - 1996|
ASJC Scopus subject areas
- Physics and Astronomy(all)