Abstract
The KLOE-2 experiment at the INFN Laboratori Nazionali di Frascati (LNF) completed its data-taking at the e + e − DAΦNE collider, which implements an innovative collision scheme based on a crab-waist configuration, and achieved the integrated luminosity of more than 5 fb−1 . KLOE-2 represents the continuation of KLOE with an upgraded detector and an extended physics program which includes, among the main topics, neutral kaon interferometry and test of discrete symmetries . Entangled neutral kaon pairs produced at DAΦNE are a unique tool to test discrete symmetries and quantum coherence at the utmost sensitivity, strongly motivating the experimental searches of possible CPT violating effects, which would constitute an unambiguous signal of New Physics. The status of the test of Time reversal and CPT simmetry in decays with KLOE and KLOE-2 data will be discussed.
Highlights
D√AΦNE, the Frascati φ–factory, is an e+e− collider working at a center of mass energy of s∼1020MeV[1], corresponding to the peak of the φ resonance
The upgrade of the KLOE detector was based on: i) an inner tracker (IT) made of cylindrical GEM for the improvement of tracking and decay vertex resolution close to the interaction point (IP)[6], ii) two e+e− tagging system for the γγ physics at low and high lepton energy regimes [7, 8], a pair of crystal calorimeters inside the innermost part of the detector, close to IP, to increase the photon acceptance down to 8◦ [9], iii) a pair of scintillator/absorber detectors surrounding the beam pipe region [10] to improve acceptance and efficiency for photons and pions coming from neutral kaon decays
Discrete symmetry tests in kaon transition amplitudes The quantum correlation between the two neutral kaons allows the time-tagging of the initial state of one of the two by using the decay of the other as shown in fig. 1
Summary
D√AΦNE, the Frascati φ–factory, is an e+e− collider working at a center of mass energy of s∼1020MeV[1], corresponding to the peak of the φ resonance. The KLOE experiment at DAΦNE completed its first data taking campaign in March 2006 with a total integrated luminosity of ∼2.5 fb−1, corresponding to a production of ∼7.5×109 φ-mesons and ∼2.5×109 K0K0 pairs. The KLOE-2 physics program includes neutral kaon interferometry and tests of discrete symmetries and quantum mechanics.
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