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Search for DeltaS = 2 nonleptonic hyperon decays.
C G White1, R A Burnstein, A Chakravorty
1Illinois Institute of Technology, Chicago, Illinois 60616, USA.
Physical Review Letters
|March 24, 2005
Summary
Researchers searched for rare Omega(-)-->Lambdapi(-) and Xi(0)-->ppi(-) decays. New limits were set for these hyperon decays, with branching fractions below 2.9 x 10^-6 and 8.2 x 10^-6, respectively.
Area of Science:
- Particle Physics
- High Energy Physics
- Hyperon Decays
Background:
- Rare hyperon decays provide insights into fundamental symmetries.
- Previous searches have constrained certain decay modes.
- The Standard Model predicts specific branching ratios for these processes.
Purpose of the Study:
- To conduct a sensitive search for the rare Omega(-)-->Lambdapi(-) and Xi(0)-->ppi(-) decays.
- To establish new limits on the branching fractions of these decays.
- To probe potential deviations from the Standard Model in hyperon decays.
Main Methods:
- Utilized data from the 1997 run of the HyperCP (Fermilab E871) experiment.
- Employed sensitive search techniques to identify candidate decay events.
- Applied rigorous analysis to set upper limits on branching fractions.
Main Results:
- Established a branching-fraction limit for Omega(-)-->Lambdapi(-) of less than 2.9 x 10^-6 (90% C.L.).
- Established a branching-fraction limit for Xi(0)-->ppi(-) of less than 8.2 x 10^-6 (90% C.L.).
- These limits do not exclude observable rates for |DeltaS| = 2 nonleptonic hyperon decays via parity-odd operators.
Conclusions:
- The search provides stringent new limits on rare hyperon decays.
- The results contribute to the ongoing investigation of fundamental particle interactions.
- Further studies are warranted to explore the implications for theoretical models.