The first observation of the decay B0→D ̄0K +K - is reported from an analysis of 0.62fb -1 of pp collision data collected with the LHCb detector. Its branching fraction is measured relative to that of the topologically similar decay B0→D ̄0π +π - to be B(B0→D ̄0K +K -)B(B0→D ̄0π +π -)=0.056±0.011±0.007,where the first uncertainty is statistical ; the second is systematic. The significance of the signal is 5.8σ. Evidence, with 3.8σ significance, for Bs0→D ̄0K +K - decays is also presented. The relative branching fraction is measured to be B(Bs0→D ̄0K +K -)B(B0→D ̄0K +K -)=0.90±0.27±0.20. These channels are of interest to study the mechanisms behind hadronic B decays, ; open new possibilities for CP violation analyses with larger data sets. © 2012 CERN.

Observation of B0→D ̄0K+ K- ; evidence for Bs0→D ̄0K+ K-

PALANO, Antimo;PAPPAGALLO, MARCO IGNAZIO;
2012-01-01

Abstract

The first observation of the decay B0→D ̄0K +K - is reported from an analysis of 0.62fb -1 of pp collision data collected with the LHCb detector. Its branching fraction is measured relative to that of the topologically similar decay B0→D ̄0π +π - to be B(B0→D ̄0K +K -)B(B0→D ̄0π +π -)=0.056±0.011±0.007,where the first uncertainty is statistical ; the second is systematic. The significance of the signal is 5.8σ. Evidence, with 3.8σ significance, for Bs0→D ̄0K +K - decays is also presented. The relative branching fraction is measured to be B(Bs0→D ̄0K +K -)B(B0→D ̄0K +K -)=0.90±0.27±0.20. These channels are of interest to study the mechanisms behind hadronic B decays, ; open new possibilities for CP violation analyses with larger data sets. © 2012 CERN.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11586/179778
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