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

Abstract : 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.
Type de document :
Article dans une revue
Physical Review Letters, American Physical Society, 2012, 109, pp.131801. <10.1103/PhysRevLett.109.131801>


http://hal.in2p3.fr/in2p3-00720938
Contributeur : Sabine Starita <>
Soumis le : jeudi 26 juillet 2012 - 11:16:26
Dernière modification le : mardi 11 octobre 2016 - 13:41:19

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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, American Physical Society, 2012, 109, pp.131801. <10.1103/PhysRevLett.109.131801>. <in2p3-00720938>

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