Search for the decay D0 to \pi+ \pi- \mu+ \mu-

R. Aaij , Y. Amhis (1) , S. Barsuk (1) , O. Callot (1) , J. He (1) , O. Kochebina (1) , J. Lefrançois (1) , F. Machefert (1) , A. Martin Sanchez (1) , M. Nicol (1) , P. Robbe (1) , M.-H. Schune (1) , M. Teklishyn (1) , A. Vallier (1) , B. Viaud (1) , E. Ben-Haim (2) , M. Benayoun (2) , P. David (2) , L. del Buono (2) , A. Martens (2) , D.A. Milanes (2) , F. Polci (2) , C. Adrover (3) , E. Aslanides (3) , J. Cogan (3) , W. Kanso (3) , R. Legac (3) , O. Leroy (3) , G. Mancinelli (3) , E. Maurice (3) , A. Mordà (3) , M. Perrin-Terrin (3) , M. Sapunov (3) , J. Serrano (3) , A. Tsaregorodtsev (3) , Ziad Zj Ajaltouni (4) , M. Baalouch (4) , E. Cogneras (4) , O. Deschamps (4) , I. El Rifai (4) , M. Grabalosa Gándara (4) , Pierre Henrard (4) , M. Hoballah (4) , R. Lefèvre (4) , L. Li Gioi (4) , J. Maratas (4) , S. Monteil (4) , V. Niess (4) , Pascal Perret (4) , Diego Alejandro Roa Romero (4) , I. de Bonis (5) , D. Decamp (5) , N. Déléage (5) , Ph. Ghez (5) , J.-P. Lees (5) , I.V. Machikhiliyan (5) , M.-N. Minard (5) , B. Pietrzyk (5) , W. Qian (5) , S. t'Jampens (5) , V. Tisserand (5) , E. Tournefier (5)

1 LAL - Laboratoire de l'Accélérateur Linéaire
2 LPNHE - Laboratoire de Physique Nucléaire et de Hautes Énergies
3 CPPM - Centre de Physique des Particules de Marseille
4 LPC - Laboratoire de Physique Corpusculaire - Clermont-Ferrand
5 LAPP - Laboratoire d'Annecy de Physique des Particules

A search for the D0 to \pi+ \pi- \mu+ \mu- decay, where the muon pair does not originate from a resonance, is performed using proton-proton collision data corresponding to an integrated luminosity of 1.0 fb-1 recorded by the LHCb experiment at a centre-of-mass energy of 7 TeV. No signal is observed and an upper limit on the relative branching fraction with respect to the resonant decay mode D0 to \pi+ \pi- \phi(to \mu+ \mu-), under the assumption of a phase-space model, is found to be B(D0 to \pi+ \pi- mu+ mu-)/B(D0 to \pi+ \pi- \phi(to \mu+ \mu-)) < 0.96 at the 90% confidence level. The upper limit on the absolute branching fraction is evaluated to be B(D0 to \pi+ \pi- \mu+ \mu-) < 5.5 x 10-7 at 90% confidence level. This is the most stringent to date.

Domaines: Physique des Hautes Energies - Expérience [hep-ex]

R. Aaij, Y. Amhis, S. Barsuk, O. Callot, J. He, et al.. Search for the decay D0 to \pi+ \pi- \mu+ \mu-. Physics Letters B, 2014, 728, pp.234-243. ⟨10.1016/j.physletb.2013.11.053⟩. ⟨in2p3-00871699⟩