Dalitz plot analysis of $B_s^0\to {\bar{D}}^0{K}^{-}{\pi }^{+}$ decays

Abstract

The resonant substructure of $B_s^0\to {\bar{D}}^0{K}^{-}{\pi }^{+}$ decays is studied with the Dalitz plot analysis technique. The study is based on a data sample corresponding to an integrated luminosity of $3.0{\mathrm{fb}}^{-1}$ of $pp$ collision data recorded by LHCb. A structure at $m({\bar{D}}^0{K}^{-})\approx 2.86\mathrm{GeV}/c^2$ is found to be an admixture of spin-1 and spin-3 resonances. The masses and widths of these states and of the $D_{s2}^{\ast }(2573{)}^{-}$ meson are measured, as are the complex amplitudes and fit fractions for all the ${\bar{D}}^0{K}^{-}$ and $K^{-}{\pi }^{+}$ components included in the amplitude model. In addition, the $D_{s2}^{\ast }(2573{)}^{-}$ resonance is confirmed to be spin-2.

44 pages, 15 figures; updated for publication

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