The first observation of the decay B0→D̅ 0K+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→D̅ 0π+π- to be B(B0→D̅ 0K+K-)/B(B0→D̅ 0π+π-)=0.056±0.011±0.007,where the first uncertainty is statistical and the second is systematic. The significance of the signal is 5.8σ. Evidence, with 3.8σ significance, for Bs0→D̅ 0K+K- decays is also presented. The relative branching fraction is measured to be B(Bs0→D̅ 0K+K-)/B(B0→D̅ 0K+K-)=0.90±0.27±0.20. These channels are of interest to study the mechanisms behind hadronic B decays, and open new possibilities for CP violation analyses with larger data sets.

Observation of B^0→Dbar^0K^+K^- and Evidence for B_s^0→Dbar^0K^+K^-

CARDINALE, ROBERTA;FONTANELLI, FLAVIO;PATRIGNANI, CLAUDIA;PETROLINI, ALESSANDRO;SANNINO, MARIO;
2012

Abstract

The first observation of the decay B0→D̅ 0K+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→D̅ 0π+π- to be B(B0→D̅ 0K+K-)/B(B0→D̅ 0π+π-)=0.056±0.011±0.007,where the first uncertainty is statistical and the second is systematic. The significance of the signal is 5.8σ. Evidence, with 3.8σ significance, for Bs0→D̅ 0K+K- decays is also presented. The relative branching fraction is measured to be B(Bs0→D̅ 0K+K-)/B(B0→D̅ 0K+K-)=0.90±0.27±0.20. These channels are of interest to study the mechanisms behind hadronic B decays, and open new possibilities for CP violation analyses with larger data sets.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11567/507928
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