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  • Measurement of the charge asymmetry for the \(K_S \rightarrow \pi e \nu\) decay and test of CPT symmetry with the KLOE detector
    Anastasi, A; Babusci, D; Berłowski, M; Bloise, C; Bossi, F; Branchini, P; Budano, A; Cao, B; Capon, G; Ceradini, F; Ciambrone, P; Curciarello, F; Czerwiński, E; D'Agostini, G; Danè, E; De Leo, V; De Lucia, E; De Santis, A; De Simone, P; A Di Cicco; A Di Domenico; Domenici, D; D'Uffizi, A; Fantini, A; Fantini, G; Fermani, P; Fiore, S; Gajos, A; Gauzzi, P; Giovannella, S; Graziani, E; Ivanov, V L; Johansson, T; Kang, X; Kisielewska-Kamińska, D; Kozyrev, E A; Krzemień, W; Kupść, A; Loffredo, S; Lukin, P A; Mandaglio, G; Martini, M; Messi, R; Miscetti, S; Moricciani, D; Moskal, P; Passeri, A; Patera, V; Perez del Rio, E; Raha, N; Santangelo, P; Schioppa, M; Selce, A; Silarski, M; Sirghi, F; Solodov, E P; Tortora, L; Venanzoni, G; Wiślicki, W; Wolke, M

    arXiv.org, 08/2018
    Paper

    Using 1.63 fb\(^{-1}\) of integrated luminosity collected by the KLOE experiment about \(7\times 10^4\) \(K_S \rightarrow \pi^{\pm}e^{\mp}\nu\) decays have been reconstructed. The measured value of the charge asymmetry for this decay is \(A_S = (-4.9 \pm 5.7_{stat} \pm 2.6_{syst}) \times 10^{-3}\), which is almost twice more precise than the previous KLOE result. The combination of these two measurements gives \(A_S = (-3.8 \pm 5.0_{stat} \pm 2.6_{syst}) \times 10^{-3}\) and, together with the asymmetry of the \(K_L\) semileptonic decay, provides significant tests of the CPT symmetry. The obtained results are in agreement with CPT invariance.

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