A search for rare B meson decays at the CERN Spp̄S collider

C. Albajar, M. G. Albrow, O. C. Allkofer, K. Ankoviak, R. Apsimon, B. Aubert, C. Bacci, S. Bartha, G. Bauer, A. Bettini, A. Bezaguet, P. Biddulph, H. Bohn, A. Böhrer, R. Bonino, K. Bos, M. Botlo, D. Brockhausen, C. Buchanan, B. BuschbeckG. Busetto, A. Caner, P. Casoli, H. Castilla-Valdez, F. Cavanna, P. Cennini, S. Centro, F. Ceradini, G. Ciapetti, S. Cittolin, E. Clayton, D. Cline, J. Colas, R. Conte, J. A. Coughlan, D. Dau, C. Daum, M. Della Negra, M. Demoulin, D. Denegri, H. Dibon, A. DiCiaccio, F. J. Diez Hedo, L. Dobrzynski, J. Dorenbosch, J. D. Dowell, D. Drijard, K. Eggert, E. Eisenhandler, N. Ellis

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We report on a search for the decays B0→ μ+μ-, B→ μ+ μ-X and Bd0 → μ+ μ-K0*, which are expected to be rare if mediated by flavor changing neutral currents. Using data collected during the 1984-1989 CERN pp̄ Collider runs, the UA1 search was carried out using μ+ μ- events with 3.9<Mμμ < 5.5 GeV/c2. We find 90% confidence level upper limits on the branching for BR → μ+μ- of 8.3 × 10-6, for B → μ+μ-X of 5.0 × 10-5, and for B0d→μ+μ-K 0* of of 2.3 × 10-5. Implicatitions for upper limits on the t-quark mass are discussed.

Original languageEnglish (US)
Pages (from-to)163-170
Number of pages8
JournalPhysics Letters B
Issue number1
StatePublished - Jun 13 1991

Bibliographical note

Funding Information:
We are thankful to the management and staff of CERN and of all participating institutes for their vigorous support of the experiment. The following funding agencies have contributed to this programme: Fonds zur FSrderung der Wissenschaftlichen For-schung, Austria; Valtion luonnontieteellinen toimikunta, Suomen Ak-atemia, Finland; Institut National de Physique Nucl6aire et de Physique des Particules and Institut de Recherche Fondamentale (CEA), France; Bundesministerium ftir Forschung und Technologie, FRG; Istituto Nazionale di Fisica Nucleare, Italy; Science and Engineering Research Council, UK; Stichting Voor Fundamenteel Onderzoek der Mate° rie, The Netherlands; Centro de Investigaciones Energetica, Medioam-bientales y Tecnologicas (CIEMAT), Spain; Department of Energy, USA.


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