Abstract
Results are presented from a search for the rare decays Bs(0)→μ+ μ- and B(0)→μ+ μ- in pp collisions at sqrt[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(Bs(0)→μ+ μ-)=(3.0(-0.9)(+1.0))×10(-9), where the uncertainty includes both statistical and systematic contributions. An excess of Bs(0)→μ+ μ- events with respect to background is observed with a significance of 4.3 standard deviations. For the decay B(0)→μ+ μ- an upper limit of B(B(0)→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.
Highlights
Rpeffisffisu1⁄4lts7aarendpre8seTnetVed, from with a search for the rare decays B0s ! þÀ and B0 ! þÀ data samples corresponding to integrated luminosities of in 5 pp collisions and 20 fbÀ1, respectively, collected by the Compact Muon Solenoid (CMS) experiment at the LHC
In the standard model (SM) of particle physics, treelevel diagrams do not contribute to flavor-changing neutral-current (FCNC) decays
FCNC decays may proceed through higher-order loop diagrams, and this opens up the possibility for contributions from non-SM
Summary
Rpeffisffisu1⁄4lts7aarendpre8seTnetVed, from with a search for the rare decays B0s ! þÀ and B0 ! þÀ data samples corresponding to integrated luminosities of in 5 pp collisions and 20 fbÀ1, respectively, collected by the CMS experiment at the LHC. The uncertainty in the ratio of trigger efficiencies [muon identification efficiencies] for the signal and normalization samples is estimated to be (3–6)% [(1–4)%] by comparing simulation and data. The final selection is performed with BDTs trained to distinguish between signal and background event candidates.
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