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Neutral kaon pairs produced in phi decays in anti-symmetric entangled statecan be exploited to search for violation of CPT symmetry and Lorentzinvariance. We present an analysis of the CP-violating process phi->K_SK_L->pi+pi-pi+pi- based on 1.7 fb-1 of data collected by the KLOE experiment atthe Frascati phi-factory DAFNE. The data are used to perform a measurement ofthe CPT-violating parameters Delta_amu for neutral kaons in the contest of theStandard Model Extension framework. The parameters measured in the referenceframe of the fixed stars are: Delta_ao = (-6.0 +- 7.7_{stat} +- 3.1_{syst}) x10^{-18} GeV Delta_ax = ( 0.9 +- 1.5_{stat} +- 0.6_{syst}) x 10^{-18} GeVDelta_ay = (-2.0 +- 1.5_{stat} +- 0.5_{syst}) x 10^{-18} GeV Delta_az = ( 3.1+- 1.7_{stat} +- 0.5_{syst}) x 10^{-18} GeV These are presently the mostprecise measurements in the quark sector of the Standard Model Extension.

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