Measurement of the B0s→μ+μ− Branching Fraction and Search for B0→μ+μ− with the CMS Experiment
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Chatrchyan, Serguei; Brochero Cifuentes, Javier Andrés; Cabrillo Bartolomé, José Ibán; Calderón Tazón, Alicia; Chuang, Shan Huei; Duarte Campderros, Jorge; Fernández García, Marcos; Gómez Gramuglio, Gervasio; González Sánchez, Francisco Javier; Graziano, Alberto; Jordá Lope, Clara; López Virto, María Amparo; Marco de Lucas, Jesús; Marco de Lucas, Rafael José; Martínez Rivero, Celso; Matorras Weinig, Francisco; Muñoz Sánchez, Francisca Javiela; Rodrigo Anoro, Teresa; Rodríguez Marrero, Ana Yaiza; [et al.]Fecha
2013Derechos
Atribución 3.0 España. © 2013 CERN, for the CMS Collaboration
Publicado en
Physical Review Letters, 2013, 111(10), 101804
Editorial
American Physical Society
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Resumen/Abstract
Results are presented from a search for the rare decays B0s→μ+μ− and B0→μ+μ− in pp collisions at s√=7 and 8 TeV, with data samples corresponding to integrated luminosities of 5 and 20 fb−1, respectively, collected by the CMS experiment at the LHC. An unbinned maximum-likelihood fit to the dimuon invariant mass distribution gives a branching fraction B(B0s→μ+μ−)=(3.0+1.0−0.9)×10−9, where the uncertainty includes both statistical and systematic contributions. An excess of B0s→μ+μ− events with respect to background is observed with a significance of 4.3 standard deviations. For the decay B0→μ+μ− an upper limit of B(B0→μ+μ−)<1.1×10−9 at the 95% confidence level is determined. Both results are in agreement with the expectations from the standard model.
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