Affordable Access

Measurement of the Bs0→μ+μ- branching fraction and search for B0→μ+μ- with the CMS experiment

  • Chatrchyan, S.
  • Khachatryan, V.
  • Sirunyan, A. M.
  • Tumasyan, A.
  • Adam, W.
  • Bergauer, T.
  • Dragicevic, M.
  • Erö, J.
  • Fabjan, C.
  • Friedl, M.
  • Frühwirth, R.
  • Ghete, V. M.
  • Hörmann, N.
  • Hrubec, J.
  • Jeitler, M.
  • Kiesenhofer, W.
  • Knünz, V.
  • Krammer, M.
  • Krätschmer, I.
  • Liko, D.
  • And 2190 more
Publication Date
Sep 05, 2013
Repositório Institucional UNESP
External links


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.

Report this publication


Seen <100 times