https://doi.org/10.1140/epjc/s10052-011-1604-7
Regular Article - Experimental Physics
Precision measurement of the K S meson lifetime with the KLOE detector
1
Laboratori Nazionali di Frascati dell’INFN, Frascati, Italy
2
Institut für Kernphysik, Johannes Gutenberg—Universität Mainz, Mainz, Germany
3
Dipartimento di Scienze Fisiche dell’Università “Federico II”, Napoli, Italy
4
INFN Sezione di Napoli, Napoli, Italy
5
Dipartimento di Energetica dell’Università “La Sapienza”, Roma, Italy
6
Dipartimento di Fisica dell’Università “La Sapienza”, Roma, Italy
7
INFN Sezione di Roma, Roma, Italy
8
Dipartimento di Fisica dell’Università “Tor Vergata”, Roma, Italy
9
INFN Sezione di Roma Tor Vergata, Roma, Italy
10
Dipartimento di Fisica dell’Università Roma Tre, Roma, Italy
11
INFN Sezione di Roma Tre, Roma, Italy
12
Physics Department, State University of New York, Stony Brook, USA
13
Institute for Theoretical and Experimental Physics, Moscow, Russia
14
Università of Udine and LIP/IST, INFN Sezione di Trieste, Trieste, Italy
15
Università di Udine and IUAV, Venezia, Italy
16
Dipartimento di Scienza e Tecnologie applicate, Università Guglielmo Marconi, Roma, Italy
17
CERN, 1211, Geneva 23, Switzerland
* e-mail: Marco.Dreucci@lnf.infn.it
Received:
11
November
2010
Revised:
11
February
2011
Published online:
24
March
2011
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±0.029stat±0.043syst) 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.
© Springer-Verlag / Società Italiana di Fisica, 2011
