A Measurement of the Ds+ Lifetime
FOCUS Collaboration, J. M. Link
TL;DR
This paper reports a high-precision measurement of the Ds+ meson lifetime using two decay modes in a Fermilab experiment, significantly improving the accuracy over previous measurements.
Contribution
It provides a new, more precise measurement of the Ds+ lifetime based on high-statistics data from the Fermilab FOCUS experiment, analyzing two decay channels.
Findings
Measured lifetime: 507.4 +/- 5.5 (stat.) +/- 5.1 (syst.) fs
Used 8961 +/- 105 and 4680 +/- 90 decays for analysis
Achieved a significant improvement over previous world averages.
Abstract
A high statistics measurement of the Ds+ lifetime from the Fermilab fixed-target FOCUS photoproduction experiment is presented. We describe the analysis of the two decay modes, Ds+ -> phi(1020)pi+ and Ds+ -> \bar{K}*(892)0K+, used for the measurement. The measured lifetime is 507.4 +/- 5.5 (stat.) +/- 5.1 (syst.) fs using 8961 +/- 105 Ds+ -> phi(1020)pi+ and 4680 +/- 90 Ds+ -> \bar{K}*(892)0K+ decays. This is a significant improvement over the present world average.
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