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

Abstract : 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 be 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.
Type de document :
Article dans une revue
Physics Letters B, Elsevier, 2016, 757, pp.558-567. 〈10.1016/j.physletb.2016.04.029〉

http://hal.in2p3.fr/in2p3-01222150
Contributeur : Claudine Bombar <>
Soumis le : jeudi 29 octobre 2015 - 12:05:56
Dernière modification le : jeudi 18 janvier 2018 - 01:51:13

### Citation

R. Aaij, L. Beaucourt, M. Chefdeville, D. Decamp, N. Déléage, et al.. First observation of the decay D0→K−π+μ+μ− in the ρ0-ω region of the dimuon mass spectrum. Physics Letters B, Elsevier, 2016, 757, pp.558-567. 〈10.1016/j.physletb.2016.04.029〉. 〈in2p3-01222150〉

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