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First observation of the decay D0→K−π+μ+μ− in the ρ0–ω region of the dimuon mass spectrum
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© 2016 CERN for the benefit of the LHCb Collaboration. A study of the decay D0→K-π+μ+μ-is performed using data collected by the LHCb detector in proton-proton collisions at a centre-of-mass energy of 8 TeV, corresponding to an integrated luminosity of 2.0 fb-1. Decay candidates with muon pairs that have an invariant mass in the range 675-875 MeV/c2are considered. This region is dominated by the ρ0and ω resonances. The branching fraction in this range is measured to beB(D0→K-π+μ+μ-)=(4.17±0.12(stat)±0.40(syst))×10-6. This is the first observation of the decay D0→K-π+μ+μ-. Its branching fraction is consistent with the value expected in the Standard Model.
Date issued
2016Journal
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Publisher
Elsevier BV
Citation
Aaij, R., et al. "First Observation of the Decay D0?K-?+?+?- in the ?0-O Region of the Dimuon Mass Spectrum." Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 757 (2016): 558-67.
Version: Final published version