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 and 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, and open new possibilities for CP violation analyses with larger data sets. © 2012 CERN.

Aaij, R., Abellan Beteta, C., Adametz, A., Adeva, B., Adinolfi, M., Adrover, C., et al. (2012). Observation of B0→D ̄0K+ K- and evidence for Bs0→D ̄0K+ K-. PHYSICAL REVIEW LETTERS, 109(13) [10.1103/PhysRevLett.109.131801].

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

CALVI, MARTA;KUCHARCZYK, MARCIN;Martinelli, M;PEREGO, DAVIDE LUIGI;PESSINA, GIANLUIGI EZIO;
2012

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 and 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, and open new possibilities for CP violation analyses with larger data sets. © 2012 CERN.
Articolo in rivista - Articolo scientifico
Heavy Flavour Physics, LHC Collider
English
2012
109
13
131801
none
Aaij, R., Abellan Beteta, C., Adametz, A., Adeva, B., Adinolfi, M., Adrover, C., et al. (2012). Observation of B0→D ̄0K+ K- and evidence for Bs0→D ̄0K+ K-. PHYSICAL REVIEW LETTERS, 109(13) [10.1103/PhysRevLett.109.131801].
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/70180
Citazioni
  • Scopus 29
  • ???jsp.display-item.citation.isi??? 24
Social impact