Measurement of the Ds Lifetime
Fermilab E791 Collaboration: E. M. Aitala, et al
TL;DR
This paper presents a precise measurement of the Ds meson lifetime using fully reconstructed decay events, revealing a significantly different lifetime from the D0, which has implications for understanding charm meson decay dynamics.
Contribution
The study provides a highly accurate measurement of the Ds lifetime and compares it to the D0 lifetime, highlighting a notable difference with statistical significance.
Findings
Measured Ds lifetime: 0.518 +/- 0.014 +/- 0.007 ps
Lifetime ratio of Ds to D0: 1.25 +/- 0.04
Significant difference between Ds and D0 lifetimes
Abstract
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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