Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2003-10-14
Phys.Rev.D69:011103,2004
Physics
High Energy Physics
High Energy Physics - Experiment
8 pages, 4 postscript figues, submitted to Phys. Rev. D(Rapid Communications)
Scientific paper
10.1103/PhysRevD.69.011103
We have used a study of the process e+e- --> mu+ mu- gamma at a center-of-mass energy near the Y(4S) resonance for a mu+ mu- invariant mass range near the J/psi mass to extract the cross section sigma(e+e- --> J/psi gamma --> mu+ mu- gamma). The data set, corresponding to an integrated luminosity of 88.4 fb-1, was collected using the BaBar detector at the PEP-II collider. We measure the product Gamma(J/psi --> e+e-)B(J/psi --> mu+ mu-) to be 0.330 +/- 0.008(stat) +/- 0.007(syst) keV. Using the world averages for B(J/psi --> mu+ mu-) and B(J/psi --> e+e-), we derive the J/psi electronic and total widths: Gamma(J/psi --> e+e-)=5.61+/-0.20 keV and Gamma=94.7+/-4.4 keV.
"The BABAR Collaboration
Aubert B.
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