A search for the rare decays B-S(0) -> mu(+)mu(-) and B-0 -> mu(+)mu(-) performed in pp collisions at root s = 7 TeV, with a data sample corresponding to an integrated luminosity of 5 fb(-1) collected by the CMS experiment at the LHC. In both decays, the number of events observed after all selection requirements is consistent with the expectation from background plus standard model signal predictions. The resulting upper limits on the branching fractions are B(B-S(0) -> mu(+)mu(-)) mu(+)mu(-) ) < 1.8 x 10(-9) at 95% confidence level.

National Scientific Research Foundation, and National Office for Research and Technology, Hungary

Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional (CINVESTAV)

Fonds pour la Formation a la Recherche dans l'Industrie et dans l'Agriculture (FRIA-Belgium)

Ministry of Science and Higher Education and the National Science Centre, Poland

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Commissariat à l'énergie atomique et aux énergies alternatives (CEA)

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Fundação de Amparo à Pesquisa do Estado do Rio de Janeiro (FAPERJ)

Institute for Studies in Theoretical Physics and Mathematics, Iran