Measurements of J/psi --> p \bar{p}

Details Measurements of J/psi --> p \bar{p} Measurements of J/psi --> p \bar{p}

2004-02-25

arxiv.org/abs/hep-ex/0402034v3

Phys.Lett.B591:42-48,2004

Physics

High Energy Physics

High Energy Physics - Experiment

6 pages, 2 figures, RevTex4, Submitted to Phys.Lett.B

Scientific paper

10.1016/j.physletb.2004.04.022

The process J/\psi --> p \bar{p} is studied using 57.7 X 10^6 J/\psi events collected with the BESII detector at the Beijing Electron Positron Collider. The branching ratio is determined to be Br(J/\psi --> p \bar{p})=(2.26 +- 0.01 +- 0.14) X 10^{-3}, and the angular distribution is well described by \frac{dN}{d cos\theta_p}=1+\alpha\cos^2\theta_p with \alpha = 0.676 +- 0.036 +- 0.042, where \theta_p is the angle between the proton and beam directions. The value of \alpha obtained is in good agreement with the predictions of first-order QCD.

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