Measurement of the KL meson lifetime with the KLOE detector

F. Ambrosino, A. Antonelli, M. Antonelli, C. Bacci, P. Beltrame, G. Bencivenni, S. Bertolucci, C. Bini, C. Bloise, V. Bocci, F. Bossi, D. Bowring (+74 others)
2005 Physics Letters B  
We present a measurement of the KL lifetime using the KLOE detector. From a sample of 4 x 10^8 KS KL pairs following the reaction e+ e- -> phi -> KS KL we select 15 x 10^6 KL -> p0 p0 p0 decays tagged by KS -> pi+ pi- events. From a fit of the proper time distribution we find tau_L = (50.92 +- 0.17stat +- 0.25syst) ns. This is the most precise measurement of the KL lifetime performed to date.
doi:10.1016/j.physletb.2005.08.022 fatcat:pz7lcnwpwrhn5d4yru52augfaa