Measurement of the Ds Lifetime

Details Measurement of the Ds Lifetime Measurement of the Ds Lifetime

1998-11-10

arxiv.org/abs/hep-ex/9811016v1

Phys.Lett.B445:449-454,1999

Physics

High Energy Physics

High Energy Physics - Experiment

12 pages, 3 figures, 2 table. LaTeX

Scientific paper

10.1016/S0370-2693(98)01476-2

We report the results of a precise measurement of the Ds meson lifetime based on 1662 +/- 56 fully reconstructed Ds -> phi pi 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.

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