Ammar, Raymond G.Ball, S.Baringer, Philip S.Coppage, DonCopty, N.Davis, Robin E. P.Hancock, N.Kelly, M.Kwak, NowhanLam, H.2007-04-142007-04-141993-12BATTLE, M, ERNST, J, et al. Observation of B(0) decay to 2 charmless mesons. PHYSICAL REVIEW LETTERS. December 1993. 71(240 : 3922-3926https://hdl.handle.net/1808/1470We report results from a search for the decays B0 --> pi+pi-, B0 --> K+pi-, and B0 --> K+K-. We find 90% confidence level upper limits on the branching fractions, B(pipi) < 2.9 x 10(-5) , B(Kpi) < 2.6 x 10(-5), and B(KK) < 0.7 x 10(-5). While there is no statistically significant signal in the individual modes, the sum of B(pipi) and B(Kpi) exceeds zero with a significance of more than 4 standard deviations, indicating that we have observed charmless hadronic B decays.en-USArticle10.1103/PhysRevLett.71.3922openAccess