Search for the Decay D0 -> gamma gamma and Measurement of the Branching Fraction for D0 -> pi0 pi0
J. P. Lees
(1)
,
V. Poireau
(1)
,
V. Tisserand
(1)
,
D. Bernard
(2)
,
M. Verderi
(2)
,
N. Arnaud
(3)
,
M. Davier
(3)
,
D. Derkach
(3)
,
G. Grosdidier
(3)
,
F. Le Diberder
(3)
,
A.M. Lutz
(3)
,
B. Malaescu
(3)
,
P. Roudeau
(3)
,
M.H. Schune
(3)
,
A. Stocchi
(3)
,
G. Wormser
(3)
,
S. Akar
(4)
,
E. Ben-Haim
(4)
,
M. Bomben
(4)
,
G.R. Bonneaud
(2)
,
H. Briand
(4)
,
G. Calderini
(4)
,
J. Chauvau
(4)
,
O. Hamon
(4)
,
Ph. Leruste
(4)
,
G. Marchiori
(4)
,
J. Ocariz
(4)
,
S. Sitt
(4)
N. Arnaud
- Function : Author
- PersonId : 16841
- IdHAL : nicolas-arnaud
- ORCID : 0000-0001-6589-8673
M. Bomben
- Function : Author
- PersonId : 1380362
- ORCID : 0000-0002-9807-861X
- IdRef : 242005462
G. Calderini
- Function : Author
- PersonId : 10608
- IdHAL : giovanni-calderini
- ORCID : 0000-0002-9495-9145
- IdRef : 172243211
G. Marchiori
- Function : Author
- PersonId : 741274
- IdHAL : giovanni-marchiori
- ORCID : 0000-0003-2655-7643
- IdRef : 180997203
Abstract
We search for the rare decay of the $D^{0}$ meson to two photons, $D^0 \rightarrow \gamma \gamma$, and present a measurement of the branching fraction for a $D^0$ meson decaying to two neutral pions, ${B}(D^0 \rightarrow \pi^0 \pi^0)$. The data sample analyzed corresponds to an integrated luminosity of 470.5 {\sl B {-0.4em} {\small\sl A} {-0.37em} \sl B {-0.4em} {\small\sl A {-0.02em}R}} detector at the PEP-II asymmetric-energy $e^{+} e^{-}$ collider at SLAC. We place an upper limit on the branching fraction for the decay of a $D^0$ meson to two photons, ${B}(D^0 \rightarrow \gamma \gamma) < 2.2 \times 10^{-6}$, at 90% confidence level, and find ${B}(D^0 \rightarrow \pi^0 \pi^0) = (8.4 \pm 0.1 \pm 0.4 \pm 0.3) \times 10^{-4}$.