Search for $D^0\to\gamma\gamma$ and improved measurement of the branching fraction for $D^0 \to \pi^0\pi^0$ - INSPIRE

DataBETA

Search for $D^0\to\gamma\gamma$ and improved measurement of the branching fraction for $D^0 \to \pi^0\pi^0$

BESIII

Collaboration

May 12, 2015

10 pages

Published in:

Phys.Rev.D 91 (2015) 11, 112015

Published: Jun 26, 2015

e-Print:

1505.03087 [hep-ex]

DOI:

10.1103/PhysRevD.91.112015

PDG:

{{\mathit D}^{0}}

\rightarrow

{{\mathit \pi}^{0}}

Experiments:

BEPC-BES-III

View in:

reference search25 citations

Citations per year

Abstract: (APS)

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.

Note:

Minor revisions, version published in Physical Review D

12.60.-i
13.20.-v
13.20.Fc
13.25.Ft
experimental results
neutral current: flavor changing
electron positron: annihilation
branching ratio
BES
D0: decay

References(40)

Figures(6)

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