First observation of the decay D0→K-π+μ+μin the ρ0-ω region of the dimuon mass spectrum

The LHCb Collaboration

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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.
Original languageEnglish
Pages (from-to)558-567
Number of pages10
JournalPhysics Letters B
Publication statusPublished - 2016
Externally publishedYes

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