Measurement of the charged kaon lifetime with the KLOE detector

F. Ambrosino , A. Antonelli , M. Antonelli , F. Archilli , C. Bacci , P. Beltrame , G. Bencivenni , S. Bertolucci

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C. Bini C. Bloise S. Bocchetta F. Bossi P. Branchini R. Caloi P. Campana G. Capon T. Capussela F. Ceradini S. Chi G. Chiefari P. Ciambrone E. De Lucia A. De Santis P. De Simone G. De Zorzi A. Denig A. Di Domenico C. Di Donato B. Di Micco A. Doria M. Dreucci G. Felici A. Ferrari M. L. Ferrer S. Fiore C. Forti P. Franzini C. Gatti P. Gauzzi S. Giovannella E. Gorini E. Graziani W. Kluge V. Kulikov F. Lacava G. Lanfranchi J. Lee-Franzini D. Leone M. Martini P. Massarotti W. Mei S. Meola S. Miscetti M. Moulson S. M\"uller F. Murtas M. Napolitano F. Nguyen M. Palutan E. Pasqualucci A. Passeri V. Patera F. Perfetto M. Primavera P. Santangelo G. Saracino B. Sciascia A. Sciubba A. Sibidanov T. Spadaro M. Testa L. Tortora P. Valente G. Venanzoni R. Versaci G. Xu

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classification ✦ hep-ex

keywords chargeddecaykaonlifetimedistributionstaggedchargesdecays

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We have measured the charged kaon lifetime using a sample of 15 \times 10^6 tagged kaon decays. Charged kaons were produced in pairs at the DA\PhiNE \phi-factory, e^+e^- \to \phi \to K^+ K^-. The decay of a K^+ was tagged by the production of a K^- and viceversa. The lifetime was obtained, for both charges, from independent measurements of the decay time and decay lenght distributions. From fits to the four distributions we find \tau = (12.347\pm0.030) ns.

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Measurement of the charged kaon lifetime with the KLOE detector

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