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Related Experiment Videos

Evidence for CP violation in B0-->D+D- decays.

S Fratina1, K Abe, K Abe

  • 1J. Stefan Institute, Ljubljana.

Physical Review Letters
|August 7, 2007
PubMed

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Summary
This summary is machine-generated.

Researchers measured CP violation in B0 to D+ D- decays using 535 million events. They found evidence of CP violation and a parameter value suggesting direct CP violation, contrary to standard model predictions.

Area of Science:

  • Particle Physics
  • High-Energy Physics
  • Quantum Mechanics

Background:

  • CP symmetry violation is a key area in particle physics.
  • Understanding CP violation in B meson decays provides insights into the Standard Model and potential new physics.

Purpose of the Study:

  • To measure the branching fraction and CP violation parameters in B0 to D+ D- decays.
  • To investigate direct CP violation in this decay mode.

Main Methods:

  • Analysis of a large dataset of 535 million BBbar pairs collected by the Belle detector at the KEKB collider.
  • Precise measurement of decay rates and time-dependent CP asymmetries.

Main Results:

  • Branching fraction for B0 to D+ D- determined to be (1.97 ± 0.20(stat) ± 0.20(syst)) x 10^-4.

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  • CP violation parameter S measured as -1.13 ± 0.37(stat) ± 0.09(syst).
  • CP violation parameter A measured as 0.91 ± 0.23(stat) ± 0.06(syst), indicating significant direct CP violation.

    • Conclusions:

    • Evidence for CP violation in B0 to D+ D- decays found at 4.1 sigma.
    • The measured value of parameter A suggests large direct CP violation, which deviates from Standard Model expectations.