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

R. Aaij; L. Beaucourt; M. Chefdeville; D. Decamp; N. Déléage; P. Ghez; J.P. Lees; J.F. Marchand; M.N. Minard; B. Pietrzyk; W. Qian; S. t'Jampens; V. Tisserand; E. Tournefier; Z.J. Ajaltouni; M. Baalouch; E. Cogneras; O. Deschamps; I. El Rifai; G. Gazzoni; M. Grabalosa Gándara; Pierre Henrard; M. Hoballah; M. Kozeiha; R. Lefèvre; J. Maratas; S. Monteil; V. Niess; P. Perret; Y. Amhis; S. Barsuk; M. Borsato; O. Kochebina; J. Lefrançois; Y. Li; F. Machefert; G. Manca; R. Quagliani; P. Robbe; M-H. Schune; M. Teklishyn; A. Vallier; B. Viaud; G. Wormser; S. Akar; E. Aslanides; J. Cogan; K. De Bruyn; W. Kanso; R. Legac; O. Leroy; G. Mancinelli; M. Martin; A. Mordà; J. Serrano; A. Tayduganov; A. Tsaregorodtsev

doi:10.1016/j.physletb.2016.04.029

Journal articles

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 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.

Document type :

Journal articles

Domain :

Physics [physics] / High Energy Physics - Experiment [hep-ex]

Complete list of metadatas

http://hal.in2p3.fr/in2p3-01222150
Contributor : Claudine Bombar <>
Submitted on : Thursday, October 29, 2015 - 12:05:56 PM
Last modification on : Wednesday, September 16, 2020 - 4:29:39 PM

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

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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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