First observation of the decay D0 → K−π+μ+μ− in the ρ0–ω region of the dimuon mass spectrum

First observation of the decay D0 → K−π+μ+μ− in the ρ0–ω region of the dimuon mass spectrum

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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/c2...

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Bibliographic Details
Main Authors: Cheung, S, Evans, T, Gandini, P, Hadavizadeh, T, Harnew, N, Hill, D, Jalocha, P, John, M, Lupton, O, Malde, S, Nandi, A, Topp-Jorgenson, S, Wilkinson, G, The LHCb Collaboration
Format: Journal article
Published: Elsevier 2016
Description
Summary:.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/c2 are considered. This region is dominated by the ρ0 and ω resonances. The branching fraction in this range is measured to B(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.

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