Search for CPT and Lorentz Symmetry Violation in Neutral Kaons at KLOE/KLOE-2

Abstract

The KLOE experiment at the DAΦNE φ -factory of the INFN Frascati Laboratory collected data corresponding to 2.5 fb−1 of integrated luminosity. Neutral kaon pairs produced in φ decays offers a unique possibility to perform tests of fundamental discrete symmetries. In this contribution the entanglement of the two kaons is exploited to search for possible violation of CPT symmetry and Lorentz invariance in the context of the Standard-Model Extension (SME) framework. A new approach to the analysis of φ → KSKL → π+π−,π+π− events has been adopted allowing us to independently measure all four CPT violating parameters ∆aμ appearing for neutral kaons in the SME. The final KLOE results on ∆aμ are presented: ∆a0 = (−6.0± 7.7stat ± 3.1syst)× 10−18 GeV ∆aX = ( 0.9± 1.5stat ± 0.6syst)× 10−18 GeV ∆aY = (−2.0± 1.5stat ± 0.5syst)× 10−18 GeV ∆aZ = ( 3.1± 1.7stat ± 0.5syst)× 10−18 GeV We also shortly discuss the perspectives for a new measurement using the KLOE-2 apparatus equipped with a new inner tracker.