Possible large $CP$ violation in three body decays of heavy baryon

TL;DR

This paper introduces a new mechanism for large $CP$ violation in three-body heavy baryon decays, leveraging interference of resonances, with significant asymmetries predicted in specific decay channels.

Contribution

The paper proposes a novel mechanism for large $CP$ asymmetries in three-body baryon decays based on resonance interference effects.

Findings

Differential $CP$ asymmetry can reach 50%.

Regional $CP$ asymmetry can reach 16%.

Mechanism applicable to $ ext{Lambda}_b^0$ decay channels.

Abstract

We propose a new mechanism which can introduce large $CP$ asymmetries in the phase spaces of three-body decays of heavy baryons. In this mechanism, a large $CP$ asymmetry is induced by the interference of two intermediate resonances, which subsequently decay into two different combinations of final particles. We apply this mechanism to the decay channel $\Lambda_b^0 \to p \pi^0\pi^-$, and find that the differential $CP$ asymmetry can reach as large as $50\%$, while the regional $CP$ asymmetry can reach as large as $16\%$ in the interference region of the phase space.