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A search for $C\!P$ violation in the $\Lambda_b^0 \to p \pi^- \pi^+ \pi^-$decay is performed using LHCb data corresponding to an integrated luminosity of6.6$\,fb^{-1}$ collected in $pp$ collisions at centre-of-mass energies of 7, 8and 13$\,Te\kern -0.1em V$. The analysis uses both triple product asymmetriesand the unbinned energy test method. The highest significances of $C\!P$asymmetry are 2.9 standard deviations from triple product asymmetries and 3.0standard deviations for the energy test method. Once the global $p$-value isconsidered, all results are consistent with no $C\!P$ violation. Parityviolation is observed at a significance of $5.5$ standard deviations for thetriple product asymmetry method and $5.3$ standard deviations for the energytest method.

Search for $C\!P$ violation and observation of $P$ violation in $\Lambda_b^0 \to p \pi^- \pi^+ \pi^-$ decays