Observation of a significant excess of π⁰π⁰ events in B meson decays

B Aubert, Theresa Harrison, Kelly Ford, Christopher Hawkes, David Knowles, Sian Morgan, Richard Penny, Alan Watson, Nigel Watson

Research output: Contribution to journalArticle

37 Citations (Scopus)


We present a study of the decay B0-->pi(0)pi(0) based on a sample of 124 x 10(6) BB 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-->pi(0)pi(0))=(2.1+/-0.6+/-0.3)x10(-6), averaged over B0 and B(0) decays.
Original languageEnglish
Pages (from-to)241801
Number of pages1
JournalPhysical Review Letters
Issue number24
Early online date1 Dec 2003
Publication statusPublished - 1 Dec 2003


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