Yayın: Search for D0</sup> → γγ and improved measurement of the branching fraction for D0 → π0π0
Dosyalar
Tarih
Kurum Yazarları
Tapan, İlhan
Yazarlar
Ablikim, M.
Achasov, M. N.
Ai, X. C.
Albayrak, O.
Albrecht, M.
Ambrose, D. J.
Amoroso, A.
An, F. F.
An, Q.
Bai, J. Z.
Danışman
Dil
Türü
Yayıncı:
Amer
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Özet
Using 2.92 fb(-1) of electron-positron annihilation data collected at root s = 3.773 GeV with the BESIII detector, we report the results of a search for the flavor-changing neutral current process D-0 -> gamma gamma using a double-tag technique. We find no signal and set an upper limit at 90% confidence level for the branching fraction of B(D-0 -> gamma gamma < 3.8 x 10(-6). We also investigate D-0-meson decay into two neutral pions, obtaining a branching fraction of B(D-0 -> pi(0)pi(0)) = (8.24 +/- 0.21(stat) +/- 0.30(syst)) x 10(-4), the most precise measurement to date and consistent with the current world average.
Açıklama
Kaynak:
Anahtar Kelimeler:
Konusu
Science & technology, Physical sciences, Astronomy & astrophysics, Physics, particles & fields, Physics
