@article{7029c06b691d47a68aae33175a81eace,
title = "Search for the decay B\textasciicircum{}0 → gamma-gamma",
abstract = "We present a limit on the branching fraction for the decay B0→ ϒϒ using data collected at the ϒ(4S) resonance with the BABAR detector at the PEP-II asymmetric energy e+e− collider. Based on the observation of one event in the signal region, out of a sample of 21.3 · 106 e+e− → ϒ(4S) → BB― decays, we establish an upper limit on the branching fraction of B(B0→ ϒϒ) < 1.7 · 10−6 at the 90\% confidence level. This result substantially improves upon existing limits.",
author = "\{(The BABAR Collaboration)\} and B. Aubert and D. Boutigny and Gaillard, \{J. M.\} and A. Hicheur and Y. Karyotakis and Lees, \{J. P.\} and P. Robbe and V. Tisserand and A. Palano and Chen, \{G. P.\} and Chen, \{J. C.\} and Qi, \{N. D.\} and G. Rong and P. Wang and Zhu, \{Y. S.\} and G. Eigen and Reinertsen, \{P. L.\} and B. Stugu and B. Abbott and Abrams, \{G. S.\} and Borgland, \{A. W.\} and Breon, \{A. B.\} and Brown, \{D. N.\} and J. Button-Shafer and Cahn, \{R. N.\} and Clark, \{A. R.\} and Gill, \{M. S.\} and A. Gritsan and Y. Groysman and Jacobsen, \{R. G.\} and Kadel, \{R. W.\} and J. Kadyk and Kerth, \{L. T.\} and S. Kluth and Kolomensky, \{Yu G.\} and Kral, \{J. F.\} and C. LeClerc and Levi, \{M. E.\} and T. Liu and G. Lynch and Meyer, \{A. B.\} and M. Momayezi and Oddone, \{P. J.\} and A. Perazzo and M. Pripstein and Roe, \{N. A.\} and A. Romosan and Lange, \{D. J.\} and J. Olsen and P. Elmer",
year = "2001",
month = dec,
day = "10",
doi = "10.1103/PhysRevLett.87.241803",
language = "English (US)",
volume = "87",
pages = "241803--1--241803--7",
journal = "Physical review letters",
issn = "0031-9007",
publisher = "American Physical Society",
number = "24",
}