Search for D0 → γγ and improved measurement of the branching fraction for D0 → π0π0 /M. Ablikim, M. N. Achasov, X. C. Ai [et.al.]

Электронный ресурс
Другой Автор
Ablikim, M.
Ai, X. C.
Chelkov, G. A.
Achasov, M. N.
Источник
Physical Review D 2015 Vol. 91, № 11. P. 112015-1-112015-10
Аннотация
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.
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Предмет
статьи в журналах
Резюме
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.