First Search for the Flavor Changing Neutral Current Decay D^0 -> gamma gamma

Details First Search for the Flavor Changing Neutral Current Decay D^0 -> gamma gamma First Search for the Flavor Changing Neutral Current Decay D^0 -> gamma gamma

2002-12-17

arxiv.org/abs/hep-ex/0212045v3

Phys.Rev.Lett.90:101801,2003

Physics

High Energy Physics

High Energy Physics - Experiment

6 pages postscript, also available through http://w4.lns.cornell.edu/public/CLNS, submitted to PRL

Scientific paper

10.1103/PhysRevLett.90.101801

Using 13.8 fb^{-1} of data collected at or just below the \Upsilon(4S) with the CLEO detector, we report the result of a search for the flavor changing neutral current process D^{0} \to \gamma\gamma. We observe no significant signal for this decay mode and determine 90% confidence level upper limits on the branching fractions Br(D^{0}\to \gamma\gamma)/Br(D^{0}\to\pi^{0}\pi^{0}) < 0.033 and Br(D^{0}\to\gamma\gamma) < 2.9 \times 10^{-5}.''

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