Search for CP violation using triple product asymmetries in Λb 0 → pK − π + π −, Λb 0 → pK − K + K − and Ξb 0 → pK − K − π + decays

A search for CP and P violation using triple-product asymmetries is performed with Λ_b ⁰ → pK⁻π⁺π⁻, Λ_b ⁰ → pK⁻K⁺K⁻ and Ξ_b ⁰ → pK⁻K⁻π⁺ decays. The data sample corresponds to integrated luminosities of 1.0 fb⁻¹ and 2.0 fb⁻¹, recorded with the LHCb detector at centre-of-mass energies of 7 TeV and 8 TeV, 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 Λ_b ⁰ → pK⁻χ_c0(1P)(→π⁺π⁻, K⁺K⁻) decay is also reported.