Precision measurement of the KS meson lifetime with the KLOE detector

• Published in: The European physical journal. C, Particles and fields Vol. 71; no. 3; p. 1604
• Main Authors: Ambrosino, F., Antonelli, A., Antonelli, M., Archilli, F., Bencivenni, G., Bini, C., Bloise, C., Bocchetta, S., Bossi, F., Branchini, P., Capon, G., Capussela, T., Ceradini, F., Ciambrone, P., De Angelis, A., De Lucia, E., De Maria, M., De Santis, A., De Simone, P., De Zorzi, G., Denig, A., Di Domenico, A., Di Donato, C., Di Micco, B., Dreucci, M., Felici, G., Fiore, S., Franzini, P., Gatti, C., Gauzzi, P., Giovannella, S., Graziani, E., Jacewicz, M., Kulikov, V., Lee-Franzini, J., Martini, M., Massarotti, P., Meola, S., Miscetti, S., Moulson, M., Müller, S., Murtas, F., Napolitano, M., Nguyen, F., Palutan, M., Passeri, A., Patera, V., Santangelo, P., Sciascia, B., Sibidanov, A., Spadaro, T., Taccini, C., Tortora, L., Valente, P., Venanzoni, G., Versaci, R.
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer-Verlag 2011; Springer
• Subjects: Astronomy; Astrophysics and Cosmology; Elementary Particles; Exact sciences and technology; Hadrons; Heavy Ions; Measurement Science and Instrumentation; Nuclear Energy; Nuclear Physics; Physics; Physics and Astronomy; Quantum Field Theories; Quantum Field Theory; Regular Article - Experimental Physics; String Theory; The physics of elementary particles and fields; Proper Time; High Energy Phys; Monte Carlo; Decay Length; Systematic Uncertainty; Time distribution; Lifetime; Mesons; Mathematical physics; Elementary particles
• ISSN: 1434-6044; 1434-6052; 1434-6052
• DOI: 10.1140/epjc/s10052-011-1604-7

Using a large sample of pure, slow, short lived K 0 mesons collected with KLOE detector at DAΦNE, we have measured the K S lifetime. From a fit to the proper time distribution we find τ ( K S )=(89.562±0.029 stat ±0.043 syst ) ps. This is the most precise measurement to date of the short lived K 0 meson lifetime, in good agreement with the world average derived from previous measurements. We observe no dependence of the lifetime on the direction of the K S in galactic coordinates.