Search for $D^0\toγγ$ and improved measurement of the branching fraction for $D^0 \to π^0π^0$
M. Ablikim,
M. N. Achasov,
X. C. Ai
et al.
Abstract:Using 2.92 fb −1 of electron-positron annihilation data collected at √ s = 3.773 GeV with the BESIII detector, we report the results of a search for the flavor-changing neutral current process D 0 → γγ using a doubletag technique. We find no signal and set an upper limit at 90% confidence level for the branching fraction of B(D 0 → γγ) < 3.8×10 −6 . We also investigate D 0 -meson decay into two neutral pions, obtaining a branching fraction of B(D 0 → π 0 π 0 ) = (8.24 ± 0.21(stat.) ± 0.30(syst.)) × 10 −4 , the… Show more
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