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Related Experiment Videos

Evidence for D0-D0 mixing.

M Staric1, B Golob, K Abe

  • 1J. Stefan Institute, Ljubljana.

Physical Review Letters
|August 7, 2007
PubMed

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Summary
This summary is machine-generated.

Researchers observed evidence for D(0)-D(0) mixing, a process where a charm meson transforms into its antiparticle. The study measured lifetime differences in D(0) meson decays, finding a significant deviation from zero but no CP violation.

Area of Science:

  • Particle Physics
  • High Energy Physics
  • Quantum Mechanics

Background:

  • The Standard Model of particle physics describes fundamental particles and forces.
  • Charm mesons, like the D(0), are crucial for testing the Standard Model.
  • D(0)-D(0) mixing and CP violation are key phenomena in understanding matter-antimatter asymmetry.

Purpose of the Study:

  • To investigate evidence for D(0)-D(0) mixing.
  • To measure the difference in apparent lifetimes of D(0) decays to different final states.
  • To search for CP violation in D(0) and anti-D(0) decays.

Main Methods:

  • Analysis of 540 fb(-1) of data collected by the Belle detector at the KEKB e(+)e(-) collider.
  • Measurement of the apparent lifetimes of D(0) mesons decaying into CP eigenstates (K(+)K(-) and pi(+)pi(-)) and a flavor-specific final state (K(-)pi(+)).

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  • Calculation of the relative difference in lifetimes, y(CP), and assessment of CP asymmetry.

    • Main Results:

    • Observed evidence for D(0)-D(0) mixing with a measured y(CP) of [1.31+/-0.32(stat)+/-0.25(syst)]%, which is 3.2 standard deviations from zero.
    • No evidence for CP violation was found in the studied D(0) and anti-D(0) decays.

    Conclusions:

    • The results provide evidence for D(0)-D(0) mixing, contributing to our understanding of charm meson behavior.
    • The absence of observed CP violation in this channel sets constraints for theoretical models.
    • This study highlights the precision of measurements at high-luminosity colliders like KEKB.