Search for CP violation using triple product asymmetries in ${\mathrm{\Lambda }}_b^0\to p{K}^{-}{\pi }^{+}{\pi }^{-}$, ${\mathrm{\Lambda }}_b^0\to p{K}^{-}{K}^{+}{K}^{-}$ and ${\mathrm{\Xi }}_b^0\to p{K}^{-}{K}^{-}{\pi }^{+}$ decays

A search for $C$P and $P$ violation using triple-product asymmetries is performed with ${\mathrm{\Lambda }}_b^0\to p{K}^{-}{\pi }^{+}{\pi }^{-}$, $\Lambda^{0}{b}\to pK^{-}K^{+}K^{-}$and$\Xi^{0}{b}\to pK^{-}K^{-}\pi^{+}$ decays. The data sample corresponds to integrated luminosities of 1.0fb${}^{-1}$ and 2.0fb${}^{-1}$, recorded with the LHCb detector at centre-of-mass energies of 7TeV and 8TeV, respectively. The $CP$- and $P$-violating asymmetries are measured both integrating over all phase space and in specific phase-space regions. No significant deviation from $CP$ or $P$ symmetry is found. The first observation of ${\mathrm{\Lambda }}_b^0\to p{K}^{-}{\chi }_{c0}(1P)(\to {\pi }^{+}{\pi }^{-},K^{+}{K}^{-})$ decay is also reported.