We report the results of a precise measurement of the Ds meson lifetime based on 1662 ± 56 fully reconstructed Ds → φπ decays, from the charm hadroproduction experiment E791 at Fermilab. Using an unbinned maximum likelihood fit, we measure the Ds lifetime to be 0.518 ± 0.014 ± 0.007 ps. The ratio of the measured Ds lifetime to the world average D0 lifetime  is 1.25 ± 0.04. This result differs from unity by six standard deviations, indicating significantly different lifetimes for the Ds and the D0.
|Number of pages||6|
|Journal||Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics|
|State||Published - 7 Jan 1999|