Study of the $K_SK_L\to\pi\ell\nu 3 \pi^0$ process for time reversal symmetry test at KLOE-2

TL;DR

This paper proposes a novel method to test time-reversal symmetry directly at KLOE-2 using quantum entanglement of neutral K mesons, enabling a comparison of transition probabilities with improved decay reconstruction techniques.

Contribution

It introduces a new reconstruction method for $K_L o 3 extpi^0$ decays with high timing resolution, facilitating a direct T-symmetry test at KLOE-2.

Findings

Potential to perform a direct T-symmetry test at KLOE-2.

Development of a decay reconstruction method with ~1$ au_S$ resolution.

Framework for comparing transition probabilities between flavor and CP-definite states.

Abstract

This work presents prospects for conducting a novel direct test of time-reversal symmetry at the KLOE-2 experiment. Quantum entanglement of neutral K meson pairs uniquely available at KLOE-2 allows to probe directly the time-reversal symmetry (T) independently of CP violation. This is achieved by a comparison of probabilities for a transition between flavour and CP-definite states and its inverse obtained through exchange of initial and final states. As such a test requires the reconstruction of the $K_L\to 3\pi^0$ decay accompanied by $K_S\to\pi^{\pm}\ell^{\mp}\nu$ with good timing information, a new reconstruction method for this process is also presented which is capable of reconstructing the $K_L\to 3\pi^0$ decay with decay time resolution of O(1$\tau_S$).