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Measurements ofJ/ψ→p p ̄

Authors
Journal
Physics Letters B
0370-2693
Publisher
Elsevier
Publication Date
Volume
591
Identifiers
DOI: 10.1016/j.physletb.2004.04.022
Keywords
  • Experiments

Abstract

Abstract The process J/ψ→p p ̄ is studied using 57.7×10 6 J/ ψ events collected with the BESII detector at the Beijing Electron Positron Collider. The branching ratio is determined to be Br(J/ψ→p p ̄ )=(2.26±0.01±0.14)×10 −3 , and the angular distribution is well described by dN d cosθ p =1+α cos 2θ p with α=0.676±0.036±0.042, where θ p is the angle between the proton and beam directions. The value of α obtained is in good agreement with the predictions of first-order QCD.

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