A direct test of T symmetry in the neutral K meson system at KLOE-2

4th Symposium on Prospects in the Physics of Discrete Symmetries

Gajos, Aleksander^1

Marian Smoluchowski Institute of Physics, Jagiellonian University, Lojasiewicza 11, Cracow

30-348, Poland^1

关键词: BABAR experiment;    CP violations;    Decay time;    Final state;    Good timing;    Meson systems;    Reconstruction method;    Time reversal symmetries;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/631/1/012018/pdf
DOI  :  10.1088/1742-6596/631/1/012018

来源: IOP

【 摘 要 】

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 the T symmetry directly and independently of CP violation. This is achieved by a comparison of probabilities for a transition and its inverse obtained through an exchange of initial and final states. Such transitions between flavor and CP-definite states of the neutral kaons are only connected by the T conjugation which ensures the CP-independence of the test. While a similar measurement was performed by the BaBar experiment with neutral B mesons, the KLOE-2 detector can test T-violation in the neutral kaons system. Such a test requires i.a. reconstruction of the KL→ 3π0decay accompanied by Ks→ π±ν with good timing information. Therefore a new reconstruction method for the KL→ 3π0decay is also presented which is capable of reconstructing this process with decay time resolution of O(1τS).