1,721,305 research outputs found
A direct test of T, CP and CPT symmetries in transitions of neutral kaons with KLOE data
Full text linkDirect tests of T, CP, CPT symmetries in transitions processes of neutral kaons are briefly reviewed. The exchange of in and out states required for a genuine test involving time-reversal is implemented exploiting the entanglement of pairs produced at a φ-factory. A data sample collected by the KLOE experiment at DAΦNE corresponding to an integrated luminosity of about 1.7 fb−1 is analysed to study the φ → KSKL → π+π− πeν and φ → KSKL → πeν 3π0 processes, and to perform the first direct tests of T and CPT symmetries in kaon transitions with a precision of few percent, and to observe CP violation with this novel method
Observation of the post-tagging effect for entangled K mesons at KLOE
Full text linkNovel quantum phenomena have been recently discussed in association to a peculiar time correlation between entangled neutral kaons produced at a φ-factory: the past state of the first decayed kaon, when it was still entangled before its decay, is post-tagged by the result and the time of the future observation on the other kaon decay. This surprising ``from future to past'' effect is fully observable. Preliminary results obtained on the analysis of data collected by the KLOE experiment at the DAΦNE collider are presented, showing experimental evidence of this new effect
CPT and QM tests using kaon interferometry
No full textThe neutral kaon system offers a unique possibility to perform fundamental tests of CPT invariance, as well as of the basic principles of quantum mechanics. The most recent and significant limits on CPT violation are reviewed, including the ones related to possible decoherence mechanisms or Lorentz symmetry breaking, which might be induced by quantum gravity. The experimental results show no deviations from the expectations of quantum mechanics and CPT symmetry, while the accuracy in some cases reaches the interesting Planck scale region. Finally, prospects for this kind of experimental studies at the upgraded DAφNE e+e- collider at Frascati are briefly discussed
Comment on testing the time-reversal symmetry in neutral meson systems
No full textFollowing a stimulating question raised by R. Winston during the CP violation session of the BEACH 2012 Conference, we briefly comment about testing the time reversal symmetry in neutral meson systems, reviewing the criticism of a previous test in the neutral K meson system performed using the Kabir asymmetry, and discussing how this difficulty can be overcome exploiting the entanglement in K and B meson pairs produced at @f- and B-factories
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