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

KLOE-2 Collaboration: D. Babusci , I. Balwierz-Pytko , G. Bencivenni , C. Bloise , F. Bossi , P. Branchini , A. Budano , L. Caldeira Balkestahl

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G. Capon F. Ceradini P. Ciambrone F. Curciarello E. Czerwinski E. Dan\`e V. De Leo E. De Lucia G. De Robertis A. De Santis P. De Simone A. Di Cicco A. Di Domenico C. Di Donato R. Di Salvo D. Domenici O. Erriquez G. Fanizzi A. Fantini G. Felici S. Fiore P. Franzini A. Gajos P. Gauzzi G. Giardina S. Giovannella E. Graziani F. Happacher L. Heijkenskjold B. Hoistad M. Jacewicz T. Johansson K. Kacprzak D. Kaminska A. Kupsc J. Lee-Franzini F. Loddo S. Loffredo G. Mandaglio M. Martemianov M. Martini M. Mascolo R. Messi S. Miscetti G. Morello D. Moricciani P. Moskal F. Nguyen A. Palladino A. Passeri V. Patera I. Prado Longhi A. Ranieri P. Santangelo I. Sarra M. Schioppa B. Sciascia M. Silarski C. Taccini L. Tortora G. Venanzoni W. Wislicki M. Wolke J. Zdebik

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classification ✦ hep-ex

keywords deltastatsystneutraldataentangledexperimentextension

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Neutral kaon pairs produced in phi 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 phi->K_S K_L->pi+pi-pi+pi- based on 1.7 fb-1 of data collected by the KLOE experiment at the Frascati phi-factory DAFNE. The data are used to perform a measurement of the CPT-violating parameters Delta_amu for neutral kaons in the contest of the Standard Model Extension framework. The parameters measured in the reference frame of the fixed stars are: Delta_ao = (-6.0 +- 7.7_{stat} +- 3.1_{syst}) x 10^{-18} GeV Delta_ax = ( 0.9 +- 1.5_{stat} +- 0.6_{syst}) x 10^{-18} GeV Delta_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 most precise measurements in the quark sector of the Standard Model Extension.

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

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