Test of CPT and Lorentz symmetry in entangled neutral kaons with the KLOE experiment

Neutral kaon pairs produced in decays in anti-symmetric entangled state can be exploited to search for violation of CPT symmetry and Lorentz invariance. We present an analysis of the CP-violating process K S K L + - + -based on 1.7 fb -1 of data collected by the KLOE experiment at the Frascati -factory DA NE. The data are used to perform a measurement of the CPT-violating parameters a for neutral kaons in the context of the Standard Model Extension framework. The parameters measured in the reference frame of the fixed stars are: