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

TL;DR

This paper searches for $CP$ and $P$ violation in a specific four-body decay of the $B^{0}$ meson using LHCb data, finding no $CP$ violation but observing $P$-parity violation with high significance.

Contribution

It introduces a novel analysis of triple-product asymmetries in $B^{0} o p ar p K^{+} ho^{-}$ decays to test $CP$ and $P$ violation, utilizing extensive LHCb data.

Findings

No evidence for $CP$ violation was observed.

$P$-parity violation was observed at 5.8 standard deviations.

The analysis provides new constraints on $CP$ and $P$ violation in charmless four-body decays.

Abstract

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