Measurement of the charge asymmetry for the KS → πeν decay and test of CPT symmetry with the KLOE detector

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.

doi:10.1007/JHEP09(2018)021

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.

Anastasi, A., Babusci, D., Berlowski, M., Bloise, C., Bossi, F., Branchini, P., et al. (2018). Measurement of the charge asymmetry for the KS → πeν decay and test of CPT symmetry with the KLOE detector. JOURNAL OF HIGH ENERGY PHYSICS, 2018(9), 1-15 [10.1007/JHEP09(2018)021].