@article{b06aa4fbf526412ab2888ef9334ccd68,
title = "Search for rare hadronic B decays",
abstract = "A search for rare decays of B hadrons has been performed using approximately two million hadronic Z0 decays collected by the OPAL experiment between 1990 and 1993. The exclusive decay channels Bd0 → π+ π-, Bd0 → K+π-, Bs0 → π+K- and Bs0 → K+K- have been studied. Such decays include contributions from flavour changing neutral current processes such as hadronic penguin decays. No significant excess of events has been observed in the π+π-, π+K- and K+K- invariant mass distributions. Consequently, upper limits on the Bd0 branching ratios, Br(Bd0→π+π-) < 4.7 × 10-5 and Br(Bd0→K+π-) < 8.1 × 10-5, and on the Bs0 branching ratios, Br(Bs0→π+K-) < 2.6 × 10-4 and Br(Bs0→K+K-) < 1.4 × 10-4, have been set at the 90% confidence level. These limits assume that the ratio of the partial decay widths of the Z0, λ (Z0 → b{\=b})/λ(Z0 → hadrons), is 0.217 and that the fractions of Bd0 and Bs0 mesons produced during fragmentation are 39.5% and 12% respectively. The Bs0 branching ratio limits are the first such limits obtained.",
author = "{OPAL Collaboration} and R. Akers and G. Alexander and J. Allison and Anderson, {K. J.} and S. Arcelli and S. Asai and A. Astbury and D. Axen and G. Azuelos and Ball, {A. H.} and E. Barberio and Barlow, {R. J.} and R. Bartoldus and Batley, {J. R.} and G. Beaudoin and A. Beck and J. Becker and C. Beeston and T. Behnke and Bell, {K. W.} and G. Bella and P. Bentkowski and S. Bentvelsen and P. Berlich and S. Bethke and O. Biebel and Bloodworth, {I. J.} and P. Bock and Bosch, {H. M.} and M. Boutemeur and S. Braibant and P. Bright-Thomas and Brown, {R. M.} and A. Buijs and Burckhart, {H. J.} and C. Burgard and P. Capiluppi and Carnegie, {R. K.} and Carter, {A. A.} and Carter, {J. R.} and Chang, {C. Y.} and C. Charlesworth and Charlton, {D. G.} and Chu, {S. L.} and Clarke, {P. E.L.} and Clayton, {J. C.} and Clowes, {S. G.} and I. Cohen and Conboy, {J. E.} and R. Folman",
note = "Funding Information: Useful comments from D. Wyler are gratefully acknowledged. It is a pleasure to thank the SL Division for the efficient operation of the LEP accelerator, the precise information on the absolute energy, and their continuing close cooperation with our experimental group. In addition to the support staff at our own institutions we are pleased to acknowledge the Department of Energy, USA, National Science Foundation, USA, Texas National Research Laboratory Commission, USA, Particle Physics and Astronomy Research Council, UK, Natural Sciences and Engineering Research Council, Canada, Fussefeld Foundation, Israeli Ministry of Energy and Ministry of Science, Minerva Gesellschaft, Japanese Ministry of Education, Science and Culture (the Monbusho) and a grant under the Monbusho International Science Research Program, German Israeli Bi-national Science Foundation (GIF), Direction des Sciences de la Mati~re du Commissariat l'Energie Atomique, France, Bundesministerium fiir Forschung und Technologie, Germany, National Research Council of Canada, A.E Sloan Foundation and Junta Nacional de Investigaq~o Cientffica e Tecnol6gica, Portugal.",
year = "1994",
month = oct,
day = "13",
doi = "10.1016/0370-2693(94)90993-8",
language = "English",
volume = "337",
pages = "393--404",
journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",
issn = "0370-2693",
publisher = "Elsevier",
number = "3-4",
}