Amplitude analysis of $B_s^0\to K_{\text{S}}^0{K}^{\pm }{\pi }^{\mp }$ decays

Abstract

The first untagged decay-time-integrated amplitude analysis of $B_s^0\to K_{\text{S}}^0{K}^{\pm }{\pi }^{\mp }$ decays is performed using a sample corresponding to $3.0$fb${}^{-1}$ of $pp$ collision data recorded with the LHCb detector during 2011 and 2012. The data are described with an amplitude model that contains contributions from the intermediate resonances $K^{\ast }(892{)}^{0,+}$, $K_2^{\ast }(1430{)}^{0,+}$ and $K_0^{\ast }(1430{)}^{0,+}$, and their charge conjugates. Measurements of the branching fractions of the decay modes $B_s^0\to K^{\ast }(892{)}^{\pm }{K}^{\mp }$ and $B_s^0\to K^{\ast }(892{)}^0\overline{K}{}^0,\overline{K}{}^{\ast }(892{)}^0{K}^0$ are in agreement with, and more precise than, previous results. The decays $B_s^0\to K_0^{\ast }(1430{)}^{\pm }{K}^{\mp }$ and $B_s^0\to K_0^{\ast }(1430{)}^0\overline{K}{}^0,\overline{K}{}_0^{\ast }(1430{)}^0{K}^0$ are observed for the first time, each with significance over 10 standard deviations.

arXiv comment27 pages, 14 figures. All figures and tables, along with any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2018-045.html

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