Observations of ${\Lambda }_b^0\to \Lambda K^{+}{\pi }^{-}$ and ${\Lambda }_b^0\to \Lambda K^{+}{K}^{-}$ decays and searches for other ${\Lambda }_b^0$ and ${\Xi }_b^0$ decays to $\Lambda h^{+}{h}^{\prime -}$ final states

Abstract

A search is performed for the charmless three-body decays of the ${\Lambda }_b^0$ and ${\Xi }_b^0$ baryons to the final states $\Lambda h^{+}{h}^{\prime -}$, where $h^{(\prime )}=\pi$ or $K$. The analysis is based on a data sample, corresponding to an integrated luminosity of $3\mathrm{f}{\mathrm{b}}^{-1}$ of $pp$ collisions, collected by the LHCb experiment. The ${\Lambda }_b^0\to \Lambda K^{+}{\pi }^{-}$ and ${\Lambda }_b^0\to \Lambda K^{+}{K}^{-}$ decays are observed for the first time and their branching fractions and $CP$ asymmetry parameters are measured. Evidence is seen for the ${\Lambda }_b^0\to \Lambda {\pi }^{+}{\pi }^{-}$ decay and limits are set on the branching fractions of ${\Xi }_b^0$ baryon decays to the $\Lambda h^{+}{h}^{\prime -}$ final states.

All figures and tables, along with any supplementary material and additional information, are available at https://lhcbproject.web.cern.ch/lhcbproject/Publications/LHCbProjectPublic/LHCb-PAPER-2016-004.html

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