Search for D0 →γγ and improved measurement of the branching fraction for D0 →π0π0


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Ablikim M., Achasov M., Ai X., Albayrak O., Albrecht M., Ambrose D., ...More

Physical Review D - Particles, Fields, Gravitation and Cosmology, vol.91, no.11, 2015 (SCI-Expanded) identifier identifier

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 D0 →γγ using a double-tag technique. We find no signal and set an upper limit at 90% confidence level for the branching fraction of B(D0 →γγ)< 3.8 × 10-6. We also investigate D0-meson decay into two neutral pions, obtaining a branching fraction of B(D0 →π0π0)= (8.24 ± 0.21(stat) ± 0.30(syst)) × 10-4, the most precise measurement to date and consistent with the current world average.