Observation of a significant excess of π(0)π(0) events in B meson decays
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Publication date
January 2003
DOI Publisher
American Physical Society (APS) ISSN
0031-9007 Journal
Physical Review Letters Language
EnglishAbstract
Copyright @ 2003 APS.We present a study of the decay B0→π0π0 based on a sample of 124×106 BB̅ pairs recorded by the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC. We observe 46±13±3 events, where the first error is statistical and the second is systematic, corresponding to a significance of 4.2 standard deviations including systematic uncertainties. We measure the branching fraction B(B0→π0π0)=(2.1±0.6±0.3)×10-6, averaged over B0 and B̅ 0 decays.This work was supported by DOE and NSF (U.S.A.), NSERC (Canada), IHEP (China), CEA and CNRS-IN2P3 (France), BMBF and DFG (Germany), INFN (Italy), FOM (The Netherlands), NFR (Norway), MIST (Russia), and PPARC (United Kingdom). Individuals have received support from the A.P. Sloan F...
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