TY  - SER
AU  - Ablikim,M.
AU  - Ai,X.C.
AU  - Chelkov,G.A.
AU  - Achasov,M.N.
ED  - Томский государственный университет
TI  - Search for D0 → γγ  and improved measurement of the branching fraction for D0 → π0π0
KW  - BESIII, детектор
KW  - BEPCII, коллайдер
KW  - пионы (частицы)
KW  - электроны
KW  - статьи в журналах
N2  - 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
UR  - http://vital.lib.tsu.ru/vital/access/manager/Repository/vtls:000532685
ER  -