Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2006-03-09
Phys.Rev.D74:011105,2006
Physics
High Energy Physics
High Energy Physics - Experiment
8 pages postscript,also available through this http://www.lns.cornell.edu/public/CLNS/2005/, Submitted to PRL
Scientific paper
10.1103/PhysRevD.74.011105
Using a sample of 3.08 million psi(2S) decays collected at sqrt{s} = 3.686 GeV with the CLEO detector at the Cornell Electron Storage Ring, we have measured the branching fractions for psi(2S) decays to pseudoscalar pairs pi+pi-, K+K-, and KsKl. We obtain B(psi(2S) -> pi+pi-) < 2.1 x 10^{-5} (90% C.L.), B(psi(2S) -> K+K-) = (6.3 +- 0.6(stat) +- 0.3(syst)) x 10^{-5}, and B(psi(2S) -> KsKl) = (5.8 +- 0.8(stat) +- 0.4(syst)) x 10^{-5}. The branching fractions allow extraction of the relative phase Delta = (95 +- 15) degrees and strength ratio R = (2.5 +- 0.4) of the three-gluon and one-photon amplitudes for these modes.
CLEO Collaboration
Dobbs Sean
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