Measurement of the charge asymmetry for the K_S rightarrow π e ν decay and test of CPT symmetry with the KLOE detector

A. Anastasi , D. Babusci , M. Ber{\l}owski , C. Bloise , F. Bossi , P. Branchini , A. Budano , B. Cao

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G. Capon F. Ceradini P. Ciambrone F. Curciarello E. Czerwi\'nski G. D'Agostini E. Dan\`e V. De Leo E. De Lucia A. De Santis P. De Simone A. Di Cicco A. Di Domenico D. Domenici A. d'Uffizi A. Fantini G. Fantini P. Fermani S. Fiore A. Gajos P. Gauzzi S. Giovannella E. Graziani V. L. Ivanov T. Johansson X. Kang D. Kisielewska-Kami\'nska E. A. Kozyrev W. Krzemie\'n A. Kup\'s\'c S. Loffredo P. A. Lukin G. Mandaglio M. Martini R. Messi S. Miscetti D. Moricciani P. Moskal A. Passeri V. Patera E. Perez del Rio N. Raha P. Santangelo M. Schioppa A. Selce M. Silarski F. Sirghi E. P. Solodov L. Tortora G. Venanzoni W. Wi\'slicki M. Wolke

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classification ✦ hep-ex

keywords asymmetrydecaykloetimeschargerightarrowstatsymmetry

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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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Measurement of the charge asymmetry for the K_S rightarrow π e ν decay and test of CPT symmetry with the KLOE detector

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