First observation and measurement of the branching fraction for the decay B0s → D∗∓sK±

The LHCb Collaboration

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The first observation of the B0s → D∗∓s K± decay is reported using 3.0 fb−1 of proton-proton collision data collected by the LHCb experiment. The D∗∓s mesons are reconstructed through the decay chain D∗∓s → γD∓s(K∓K±π∓). The branching fraction relative to that for B0s → D∗−s π+ decays is measured to be
B(B0s → D∗∓s K±)/B(B0s → D∗−s π+) = 0.068 ± 0.005+0.003−0.002 ,
where the first uncertainty is statistical and the second is systematic. Using a recent
measurement of B(B0s → D∗−s π+), the absolute branching fraction of B0s → D∗∓s K± is measured as
B(B0s → D∗∓s K±) = (16.3 ± 1.2(stat)+0.7−0.5(syst) ± 4.8(norm)) × 10−5,
where the third uncertainty is due to the uncertainty on the branching fraction of the normalisation channel.
Original languageEnglish
Article number130
Number of pages16
JournalJournal of High Energy Physics
Issue number6
Publication statusPublished - 2015
Externally publishedYes


  • Branching fraction
  • B physics
  • Flavor physics
  • Hadron-Hadron Scattering

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