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 B0B̅ 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 21-12+13 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.



Titolo: Search for the Decay B0→γγ.
Autori: 
BIASINI, Maurizio
PACETTI, Simone
PERUZZI, Ida Marena
ROSSI, ALESSANDRO
Data di pubblicazione: 2011
Rivista: 
PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY  
Abstract: We report the result of a search for the rare decay B0→γγ in 426  fb-1 of data, corresponding to 226×106 B0B̅ 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 21-12+13 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.
Handle: http://hdl.handle.net/11391/931615
Appare nelle tipologie:1.1 Articolo in rivista

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