Observation of B^0 -> D^0 K^+ K^- and evidence for B^0_s -> D^0 K^+ K^- - IN2P3 - Institut national de physique nucléaire et de physique des particules
Article Dans Une Revue Physical Review Letters Année : 2012

Observation of B^0 -> D^0 K^+ K^- and evidence for B^0_s -> D^0 K^+ K^-

R. Aaij
  • Fonction : Auteur
J. He
J. Cogan
O. Leroy
J. Serrano

Résumé

The first observation of the decay B0 -> D0bar K+ K- is reported from an analysis of 0.62 fb-1 of pp collision data collected with the LHCb detector. Its branching fraction is measured relative to that of the topologically similar decay B0 -> D0bar pi+ pi- to be BR(B0 -> D0bar K+ K-)/BR(B0 -> D0bar pi+ pi-) = 0.056+-0.011+-0.007, where the first uncertainty is statistical and the second is systematic. The significance of the signal is 5.8 sigma. Evidence, with 3.8 sigma significance, for Bs -> D0bar K+ K- decays is also presented, with a relative branching fraction of BR(Bs -> D0bar K+ K-)/BR(B0 -> D0bar K+ K-) = 0.90+-0.27+-0.20.

Dates et versions

in2p3-00720938 , version 1 (26-07-2012)

Identifiants

Citer

R. Aaij, S. Barsuk, O. Callot, J. He, B. Jean-Marie, et al.. Observation of B^0 -> D^0 K^+ K^- and evidence for B^0_s -> D^0 K^+ K^-. Physical Review Letters, 2012, 109, pp.131801. ⟨10.1103/PhysRevLett.109.131801⟩. ⟨in2p3-00720938⟩
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