Abstract
Using 1.63 fb−1 of integrated luminosity collected by the KLOE experiment about 7 × 104KS → π±e∓ν decays have been reconstructed. The measured value of the charge asymmetry for this decay is AS = (−4.9 ± 5.7stat ± 2.6syst) × 10−3, which is almost twice more precise than the previous KLOE result. The combination of these two measurements gives AS = (−3.8 ± 5.0stat ± 2.6syst) × 10−3 and, together with the asymmetry of the KL semileptonic decay, provides significant tests of the CPT symmetry. The obtained results are in agreement with CPT invariance.
Highlights
Plitudes, respectively,1 and all parameters implying CP violation
CPT violation effects might arise in a quantum gravity scenario [8, 9] and their observation would constitute an unambiguous signal of processes beyond the Standard Model
The electromagnetic calorimeter (EMC) made by lead and scintillating fibers is divided into a barrel and two end-caps, has a readout granularity of ∼ (4.4 × 4.4) cm2, for a total of 2440 cells arranged in five layers covering 98% of the solid angle
Summary
The KLOE detector operates at the DAΦNE electron-positron collider. The energy of the two colliding beams is set to the mass of the φ meson which decays predominantly into a. The electromagnetic calorimeter (EMC) made by lead and scintillating fibers is divided into a barrel and two end-caps, has a readout granularity of ∼ (4.4 × 4.4) cm, for a total of 2440 cells arranged in five layers covering 98% of the solid angle. It has energy and time resolution of σ(E)/E = 5.7%/ E[GeV], σt = 54 ps/ E[GeV] ⊕ 140 ps for photons and electrons [19]. Negative and positive charged pions interact differently in the detector material, the efficiency is separately estimated for π−e+ν and π+e−νfinal charge states
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