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A Search for the decay B^0 -> gamma gamma

Abstract : We report the result of a search for the rare decay B^0 -> gamma gamma in 426 fb-1 of data, corresponding to 226 million B^0 \bar{B}^0 pairs, collected on the Upsilon(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 statistical significance of 1.9 sigma. This corresponds to a branching fraction B(B^0 -> gamma gamma) = (1.7 +- 1.1(stat.) +- 0.2(syst.)) x 10^-7. Based on this result, we set a 90% confidence level upper limit of B(B^0 -> gamma gamma) < 3.3 x 10^-7.
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http://hal.in2p3.fr/in2p3-00534032
Contributor : Claudine Bombar <>
Submitted on : Monday, November 8, 2010 - 4:32:32 PM
Last modification on : Wednesday, September 16, 2020 - 4:21:32 PM

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P. del Amo Sanchez, J.P. Lees, V. Poireau, E. Prencipe, V. Tisserand, et al.. A Search for the decay B^0 -> gamma gamma. Physical Review D, American Physical Society, 2011, 83, pp.032006. ⟨10.1103/PhysRevD.83.032006⟩. ⟨in2p3-00534032⟩

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