The first observation of the decay B-0 -> (D) over bar (0) 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 B-0 -> (D) over bar (0) pi(+) pi(-) to be B(B-0 -> (D) over bar (0) K+ K-)/B(B-0 -> (D) over bar (0) 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 B-s(0) -> (D) over bar (0) K+ K- decays is also presented. The relative branching fraction is measured to be B(B-s(0) -> (D) over bar (0) K+ K-)/B(B-0 -> (D) over bar (0) K+ 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 -> (D)over-bar(0) K+ K- and Evidence for B-s(0) -> (D)over-bar(0) K+ K- / R., A., C. A., B., A., A., B., A., M., A., C., A., A., A., Z., A., J., A., F., A., M., A., S., A., G., A., P. A., C., A. A., A., S., A., Y., A., L., A., J., A., R. B., A., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 109:(2012), p. 131801. [10.1103/physrevlett.109.131801]

Observation of B-0 -> (D)over-bar(0) K+ K- and Evidence for B-s(0) -> (D)over-bar(0) K+ K-

G. Casse;SARTI, ALESSIO;SCIUBBA, Adalberto;
2012

Abstract

The first observation of the decay B-0 -> (D) over bar (0) 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 B-0 -> (D) over bar (0) pi(+) pi(-) to be B(B-0 -> (D) over bar (0) K+ K-)/B(B-0 -> (D) over bar (0) 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 B-s(0) -> (D) over bar (0) K+ K- decays is also presented. The relative branching fraction is measured to be B(B-s(0) -> (D) over bar (0) K+ K-)/B(B-0 -> (D) over bar (0) K+ 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
01 Pubblicazione su rivista::01a Articolo in rivista
Observation of B-0 -> (D)over-bar(0) K+ K- and Evidence for B-s(0) -> (D)over-bar(0) K+ K- / R., A., C. A., B., A., A., B., A., M., A., C., A., A., A., Z., A., J., A., F., A., M., A., S., A., G., A., P. A., C., A. A., A., S., A., Y., A., L., A., J., A., R. B., A., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 109:(2012), p. 131801. [10.1103/physrevlett.109.131801]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/493827
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