Author/Authors :
ALEPH Collaboration، نويسنده , , D. Buskulic، نويسنده , , I. De Bonis، نويسنده , , D. Decamp، نويسنده , , P. Ghez، نويسنده , , C. Goy، نويسنده , , J.-P. Lees، نويسنده , , A. Lucotte، نويسنده , , M.-N. Minard، نويسنده , , Nief، Francois نويسنده , , P. Odier، نويسنده , , B. Pietrzyk، نويسنده , , M.P. Casado، نويسنده , , M. Chmeissani، نويسنده , , J.M. Crespo، نويسنده , , M. Delfino، نويسنده , , I. Efthymiopoulos، نويسنده , , E. Fernandez، نويسنده , , M. Fernandez-Bosman، نويسنده , , Ll. Garrido، نويسنده , , et al.، نويسنده ,
Abstract :
Four candidates for charmless hadronic B decay are observed in a data sample of four million hadronic Z decays recorded by the aleph detector at lep. The probability that these events come from background sources is estimated to be less than 10−6. The average branching ratio of weakly decaying B hadrons (a mixture of Bd0, Bs0 and Λb weighted by their production cross sections and lifetimes, here denoted B) into two long-lived charged hadrons (pions, kaons or protons) is measured to be Br(B → h+h−) = (1.7−0.7+1.0 ± 0.2) × 10−5. The relative branching fraction Br(Bd(s)0 → π+π−(K−))Br(Bd(s)0 → h+h−) is measured to be 1.0−0.3 −0.1+0.0 +0.0. In addition, branching ratio upper limits are obtained for a variety of exclusive charmless hadronic two-body decays of B hadrons.
