Measurement of the charge asymmetry for the K S → πeν decay and test of CPT symmetry with the KLOE detector
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Anastasi A., Babusci D., Berlowski M., Bloise C., Bossi F., Branchini P., Budano A., Cao B., Capon G., Ceradini F., Ciambrone P., Curciarello F., Czerwinski E., D’Agostini G., Danè E., De Leo V., De Lucia E., De Santis A., De Simone P., Di Cicco A., Di Domenico A., 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-Kaminska D., Kozyrev E. A., Krzemien W., Kupsć 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., Wislicki W., Wolke M.
ISSN: 1126-6708
Using 1.63 fb −1 of integrated luminosity collected by the KLOE experiment about 7 × 10 4 K S → π ± e ∓ ν decays have been reconstructed. The measured value of the charge asymmetry for this decay is A S = (−4.9 ± 5.7 stat ± 2.6 syst ) × 10 −3 , which is almost twice more precise than the previous KLOE result. The combination of these two measurements gives A S = (−3.8 ± 5.0 stat ± 2.6 syst ) × 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.