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Related Experiment Videos

Evidence for D0-D(0) mixing using the CDF II detector.

T Aaltonen1, J Adelman, T Akimoto

  • 1Institute of Physics, Academia Sinica, Taipei, Taiwan 11529, Rpublic of China.

Physical Review Letters
|June 4, 2008
PubMed

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Summary
This summary is machine-generated.

Researchers observed rare D0 decays, finding evidence of D0-D0bar mixing. This suggests new physics beyond the Standard Model, challenging the no-mixing hypothesis with high statistical significance.

Area of Science:

  • Particle Physics
  • High Energy Physics
  • Quantum Mechanics

Background:

  • The Standard Model of particle physics describes fundamental particles and forces.
  • Rare decays of D0 mesons provide a sensitive probe for physics beyond the Standard Model.
  • D0-D0bar mixing, the oscillation between a D0 meson and its antiparticle, is a key phenomenon to study.

Purpose of the Study:

  • To measure the time dependence of the ratio of decay rates for the rare decay D0-->K+pi- to the Cabibbo-favored decay D0-->K-pi+.
  • To determine the D0-D0bar mixing parameters (R_D, y', x'^2).
  • To test the hypothesis of no D0-D0bar mixing.

Main Methods:

  • Utilized data from the Collider Detector at Fermilab II (CDF II) at the Fermilab Tevatron.
  • Collected an integrated luminosity of 1.5 fb^-1.

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  • Analyzed a signal of 12.7x10^3 D0-->K+pi- decays.

    • Main Results:

    • Observed a significant signal for the rare decay D0-->K+pi-.
    • Measured the D0-D0bar mixing parameters.
    • Found the data to be inconsistent with the no-mixing hypothesis at a significance of 3.8 standard deviations.

    Conclusions:

    • The results provide evidence for D0-D0bar mixing.
    • The findings suggest the presence of new physics beyond the Standard Model.
    • The no-mixing hypothesis is rejected with high statistical significance.