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Measurement of the D(s)+ lifetime.

J M Link¹, P M Yager, J C Anjos

¹University of California, Davis, California 95616, USA.

Physical Review Letters

|August 11, 2005

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Summary

Researchers precisely measured the D(s)+ meson lifetime using two decay modes. This high-statistics analysis significantly improves upon the current world average for this fundamental particle property.

Area of Science:

Particle Physics
High Energy Physics

Background:

The D(s)+ meson is a key particle in understanding fundamental interactions.
Accurate lifetime measurements are crucial for testing theoretical models in particle physics.

Purpose of the Study:

To present a high-statistics measurement of the D(s)+ meson lifetime.
To improve the precision of the D(s)+ lifetime compared to existing world averages.

Main Methods:

Analysis of D(s)+ decays from the Fermilab FOCUS photoproduction experiment.
Utilized two primary decay modes: D(s)+ --> phi(1020)pi+ and D(s)+ --> K*(892)0K+.

Main Results:

Measured D(s)+ lifetime: 507.4 +/- 5.5(stat) +/- 5.1(syst) fs.
Analyzed 8961 +/- 105 decays of D(s)+ --> phi(1020)pi+.

Related Experiment Videos

Analyzed 4680 +/- 90 decays of D(s)+ --> K*(892)0K+.

Conclusions:

The presented measurement offers a significant improvement in precision for the D(s)+ lifetime.
This result provides a more stringent test for theoretical predictions in particle physics.