Measurement of the CP observables in B̄s0 → Ds+ K- and first observation of B̄(s)0 → Ds+ K +π- and B̄(s)0 → Ds1(2536)+ π-

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First measurements of the CP observables in the B̄(s) 0 → Ds+ K- decay have been re-158 ported. With the larger data sample recorded in 2012, and the larger data set antici-pated in the future, this decay will contribute significantly to the determination of the weak phase γ. First observations of the B̄(s)0 → Ds+ K -π+π- and B̄0 → D+s K-π+π-are also reported. The former can be used in a similar way to B̄(s)0 → Ds+ K -- to extract γ. After including Ds+ → π+π-π+ and Ds+ → K-π+π- decays, and re-optimizing the selection for B̄(s)0 → Ds +K-π+π- only, the yield in this mode more than doubles with a comparable signal-to-background. The yield in this mode is therefore expected to have about 35-40% of that obtained in B̄ (s)0 → Ds+ K-. The B̄(s)0 → Ds1(2536) +π- decay is also observed for the first time, and its branching frac-tion relative to B̄(s)0 → D s+ π-π+π- is presented.

Original languageEnglish (US)
StatePublished - Dec 1 2012
Event7th International Workshop on the CKM Unitarity Triangle, CKM 2012 - Cincinnati, OH, United States
Duration: Sep 28 2012Oct 2 2012


Other7th International Workshop on the CKM Unitarity Triangle, CKM 2012
Country/TerritoryUnited States
CityCincinnati, OH

ASJC Scopus subject areas

  • Mathematics (miscellaneous)


Dive into the research topics of 'Measurement of the CP observables in B̄<sub>s</sub><sup>0</sup> → D<sub>s</sub><sup>+</sup> K<sub>-</sub> and first observation of B̄<sub>(s)</sub><sup>0</sup> → D<sub>s</sub><sup>+</sup> K <sub>-π</sub><sup>+</sup><sub>π</sub><sup>-</sup> and B̄<sub>(s)</sub><sup>0</sup> → D<sub>s1</sub>(2536)<sup>+</sup> <sub>π</sub><sup>-</sup>'. Together they form a unique fingerprint.

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