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Search for the decay B0→γγ

We report the result of a search for the rare decay B0→γγ in 426 fb−1 of data, corresponding to 226×106 B0B[bar]0 pairs, collected on the Υ(4S) resonance at the PEP-II asymmetric-energy e+e− collider using the BABAR detector. We use a maximum likelihood fit to extract the signal yield and observe 21...

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Hauptverfasser: Amo Sanchez, Pablo del (VerfasserIn) , Marks, Jörg (VerfasserIn) , Uwer, Ulrich (VerfasserIn)
Körperschaft: BABAR Collaboration (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: 7 February 2011
In: Physical review. D, Particles, fields, gravitation, and cosmology
Year: 2011, Jahrgang: 83, Heft: 3, Pages: 1-11
ISSN:1550-2368
DOI:10.1103/PhysRevD.83.032006
Online-Zugang:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1103/PhysRevD.83.032006
Verlag, lizenzpflichtig, Volltext: https://link.aps.org/doi/10.1103/PhysRevD.83.032006
Volltext
Verfasserangaben:BABAR Collaboration*

MARC

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520 |a We report the result of a search for the rare decay B0→γγ in 426 fb−1 of data, corresponding to 226×106 B0B[bar]0 pairs, collected on the Υ(4S) resonance at the PEP-II asymmetric-energy e+e− collider using the BABAR detector. We use a maximum likelihood fit to extract the signal yield and observe 21+13−12 signal events with a statistical significance of 1.8σ. This corresponds to a branching fraction B(B0→γγ)=(1.7±1.1(stat.)±0.2(syst.))×10−7. Based on this result, we set a 90% confidence level upper limit of B(B0→γγ)<3.2×10−7. 
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