Measurement of the Bs0→μ+μ- branching fraction and search for B0→μ+μ- with the CMS experiment
Contribuinte(s) |
Universidade Estadual Paulista (UNESP) |
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Data(s) |
27/05/2014
27/05/2014
05/09/2013
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Resumo |
Results are presented from a search for the rare decays Bs0→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(Bs0→μ+μ-)=(3.0-0.9+1.0) ×10-9, where the uncertainty includes both statistical and systematic contributions. An excess of Bs0→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. © 2013 CERN. Published by the American Physical Society under the terms of the. |
Identificador |
http://dx.doi.org/10.1103/PhysRevLett.111.101804 Physical Review Letters, v. 111, n. 10, 2013. 0031-9007 1079-7114 http://hdl.handle.net/11449/76526 10.1103/PhysRevLett.111.101804 WOS:000324232600007 2-s2.0-84884523667 2-s2.0-84884523667.pdf |
Idioma(s) |
eng |
Relação |
Physical Review Letters |
Direitos |
closedAccess |
Palavras-Chave | #Branching fractions #Confidence levels #Integrated luminosity #Invariant mass distribution #Rare decays #Standard deviation #The standard model #Upper limits #Tellurium compounds #Experiments |
Tipo |
info:eu-repo/semantics/article |