D-meson lifetimes

Abstract We present the final results on the D-meson liftime measurements obtained by the NA27 experiment. From a sample of 145 D 0 D 0 and 149 D ± decays, we have measured τ (D 0 )=(4.6 +0.6 −0.5 )×10 −13 s, τ (D ± )=(11.2 +1.4 −1.1 )×10 −13 s, with a ratio R= τ( D ± ) τ( D 0 ) =2.4±0.4 .