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New limit on CPT violation

Geer1, Marriner, Martens

  • 1Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA.

Physical Review Letters
|October 4, 2000
PubMed
Summary
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Researchers searched for antiproton decay at Fermilab, setting limits on fifteen decay modes. This provides constraints on the mass scale associated with CPT violation and baryon number violation.

Area of Science:

  • Particle Physics
  • Antimatter Research
  • Fundamental Symmetries

Background:

  • Antiprotons are the antimatter counterparts of protons.
  • Baryon number violation and CPT symmetry violation are key areas in fundamental physics.
  • Previous experiments have searched for rare particle decays.

Purpose of the Study:

  • To experimentally search for evidence of antiproton decay.
  • To establish limits on the rates of various antiproton decay modes.
  • To constrain theoretical models involving CPT violation and baryon number violation.

Main Methods:

  • Utilized the Fermilab Antiproton Accumulator for antiproton storage and observation.
  • Monitored for specific signatures indicative of antiproton decay into various final states.

Related Experiment Videos

  • Analyzed data to set upper limits on the partial decay widths for fifteen distinct decay modes.

    • Main Results:

    • No evidence for antiproton decay was observed.
    • Stringent upper limits were placed on the decay rates for fifteen different antiproton decay channels.
    • These limits translate to constraints on the characteristic mass scale, m(X), associated with CPT violation.

    Conclusions:

    • The absence of observed antiproton decay provides significant constraints on theories predicting such events.
    • The results contribute to setting limits on the scale of new physics phenomena, particularly those linked to CPT symmetry and baryon number violation.
    • This study advances our understanding of fundamental symmetries in particle physics.