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

R. Aaij L. Beaucourt 1 M. Chefdeville 1 D. Decamp 1 N. Déléage 1 P. Ghez 1 J.P. Lees 1 J.F. Marchand 1 M.N. Minard 1 B. Pietrzyk 1 W. Qian 1 S. t'Jampens 1 V. Tisserand 1 E. Tournefier 1 Z.J. Ajaltouni 2 M. Baalouch 2 E. Cogneras 2 O. Deschamps 2 I. El Rifai 2 G. Gazzoni 2 M. Grabalosa Gándara 2 Pierre Henrard 2 M. Hoballah 2 M. Kozeiha 2 R. Lefèvre 2 J. Maratas 2 S. Monteil 2 V. Niess 2 P. Perret 2 Y. Amhis 3 S. Barsuk 3 M. Borsato 3 O. Kochebina 3 J. Lefrançois 3 Y. Li 3 F. Machefert 3 G. Manca 3 R. Quagliani 3 P. Robbe 3 M-H. Schune 3 M. Teklishyn 3 A. Vallier 3 B. Viaud 3 G. Wormser 3 S. Akar 4 E. Aslanides 4 J. Cogan 4 K. De Bruyn 4 W. Kanso 4 R. Legac 4 O. Leroy 4 G. Mancinelli 4 M. Martin 4 A. Mordà 4 J. Serrano 4 A. Tayduganov 4 A. Tsaregorodtsev 4
1 LAPP/Laboratoire d'Annecy-le-Vieux de Physique des Particules - Laboratoire d'Annecy de Physique des Particules
2 LPC - Laboratoire de Physique Corpusculaire - Clermont-Ferrand
3 LAL - Laboratoire de l'Accélérateur Linéaire
4 CPPM - Centre de Physique des Particules de Marseille
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.
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Submitted on : Thursday, October 29, 2015 - 12:05:56 PM
Last modification on : Monday, June 3, 2019 - 1:38:03 PM

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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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