Abstract
The KLOE experiment at the Frascati φ –factory recently obtained results on i) CPT and Lorentz invariance tests from the study of quantum interference of the neutral kaon pairs; ii) precision measurement of the branching fraction, BR(K+ → π + π − π + (γ ) ) = 0.05565 ± 0.00031stat ± 0.00025syst , and iii) on dark photon searches with the analysis of the e + e − → µµγ final state. We have also studied the transition form factors of the φ meson to the pseudoscalars, π 0 and η , that is presented in a separate contribution to this volume.
Highlights
The KLOE experimentThe KLOE experiment at the Frascati φ–factory took most of the data in 2004-2006, with 2.5 fb−1 of integrated luminosity at the φ peak, and about 250 pb−1 at 1 GeV, 20 MeV below the resonance, for the study of di–pion and di–lepton production, and γ–γ interactions
The KLOE detector consists of a large cylindrical Drift Chamber (DC), surrounded by a leadscintillating fiber electromagnetic calorimeter (EMC), all embedded inside a superconducting coil, providing a 0.52 T axial field
A cylindrical tracking chamber based on the Gaseous Electron Multiplier (GEM) technology [3], the first cylindrical 3-GEM detector ever built, has been installed between the beam pipe and the big Drift Chamber to track particles closer to their origin; two small stations of LYSO calorimeters [4] have been placed on the beam pipe for the detection of low polar angle photons; the final focusing region has been instrumented with sampling calorimeters done by five layers of tungsten interleaved with scintillator tiles coupled to fibers that are readout on one side by silicon photomultipliers [5]
Summary
The KLOE experiment at the Frascati φ–factory took most of the data in 2004-2006, with 2.5 fb−1 of integrated luminosity at the φ peak, and about 250 pb−1 at 1 GeV, 20 MeV below the resonance, for the study of di–pion and di–lepton production, and γ–γ interactions. A cylindrical tracking chamber based on the Gaseous Electron Multiplier (GEM) technology [3], the first cylindrical 3-GEM detector ever built, has been installed between the beam pipe and the big Drift Chamber to track particles closer to their origin; two small stations of LYSO calorimeters [4] have been placed on the beam pipe for the detection of low polar angle photons; the final focusing region has been instrumented with sampling calorimeters done by five layers of tungsten interleaved with scintillator tiles coupled to fibers that are readout on one side by silicon photomultipliers [5]. A new data taking campaign aiming to collect O(10) fb−1 in 2–3 years of data taking is planned to extend the experimental program in kaon/hadron physics and on dark photon searches [6]
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