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A search for $CP$ and $P$ violation in charmless four-body $B^{0} \to p \barp K^{+} \pi^{-}$ decays is performed using triple-product asymmetryobservables. It is based on proton-proton collision data collected by the LHCbexperiment at centre-of-mass energies of $7$, $8$ and $13$ TeV, correspondingto a total integrated luminosity of $8.4$ fb$^{-1}$. The $CP$- and$P$-violating asymmetries are measured both in the integrated phase space andin specific regions. No evidence is seen for $CP$ violation. $P$-parityviolation is observed at a significance of 5.8 standard deviations

Search for $CP$ violation using $\hat{T}$-odd correlations in $B^{0} \to p \bar p K^{+} \pi^{-}$ decays