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Search for CP violation in charged-Xi and Lambda hyperon decays.

T Holmstrom¹, N Leros, R A Burnstein

¹University of Virginia, Charlottesville, Virginia 22904, USA.

Physical Review Letters

|February 9, 2005

Summary

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This summary is machine-generated.

Researchers found no evidence of CP violation in Xi decays. This study analyzed over 150 million Xi- and Xi+ decays, contributing to our understanding of fundamental particle physics.

Area of Science:

Particle Physics
High Energy Physics
Quantum Mechanics

Background:

CP violation is a key concept in particle physics, explaining matter-antimatter asymmetry.
Understanding CP violation in hyperon decays provides insights into the Standard Model and potential new physics.

Purpose of the Study:

To search for direct CP violation in Xi- --> Lambda pi- and Xi+ --> Lambda pi+ decays.
To measure the direct-CP-violating parameter AXiLambda with high precision.

Main Methods:

Analysis of a large dataset (117 x 10^6 Xi- and 41 x 10^6 Xi+) from the HyperCP experiment (E871) at Fermilab.
Comparison of p and p angular distributions in the decay products.

Main Results:

No evidence for CP violation was observed.

Related Experiment Videos

The measured direct-CP-violating parameter AXiLambda is [0.0 +/- 5.1(stat) +/- 4.4(syst)] x 10^-4.

Conclusions:

The results place stringent limits on direct CP violation in these hyperon decays.
This finding is consistent with the predictions of the Standard Model of particle physics.