We report the result of a search for the rare decay B0→γγ in 426  fb−1 of data, corresponding to 226×106 B0B⎯⎯⎯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.

Sanchez, P.d.A., Lees, J.P., Poireau, V., Prencipe, E., Tisserand, V., Garra Tico, J., et al. (2011). Search for the decay B(0) -> gamma gamma. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 83(3), 1-11 [10.1103/PhysRevD.83.032006].

Search for the decay B(0) -> gamma gamma

PATRIGNANI, CLAUDIA;
2011

Abstract

We report the result of a search for the rare decay B0→γγ in 426  fb−1 of data, corresponding to 226×106 B0B⎯⎯⎯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.
2011
Sanchez, P.d.A., Lees, J.P., Poireau, V., Prencipe, E., Tisserand, V., Garra Tico, J., et al. (2011). Search for the decay B(0) -> gamma gamma. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 83(3), 1-11 [10.1103/PhysRevD.83.032006].
Sanchez, P. del Amo; Lees, J. P.; Poireau, V.; Prencipe, E.; Tisserand, V.; Garra Tico, J.; Grauges, E.; Martinelli, M.; Palano, A.; Pappagallo, M.; E...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/543530
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