First Evidence Ofλλ¯inχcjdecays
Physical Review D(2003)
摘要
The first observation of χcJ(J=0,1,2) decays to ΛΛ¯ is reported using ψ(2S) data collected with the Beijing Spectrometer detector at the Beijing Electron Positron Collider. The branching ratios are determined to be B(χc0→ΛΛ¯)=(4.7−1.2+1.3±1.0)×10−4, B(χc1→ΛΛ¯)=(2.6−0.9+1.0±0.6)×10−4 and B(χc2→ΛΛ¯)=(3.3−1.3+1.5±0.7)×10−4. The results are compared with model predictions.Received 7 April 2003DOI:https://doi.org/10.1103/PhysRevD.67.112001©2003 American Physical Society
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