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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
PubMed
Summary

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This summary is machine-generated.

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.

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  • 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.