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Setting Limits on Supersymmetry Using Simplified Models
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Published on: November 15, 2013

Search for CP violation in the decays D(0)→K(S)(0)P(0).

B R Ko1, E Won, K Arinstein

  • 1Korea University, Seoul.

Physical Review Letters
|June 25, 2011
PubMed
Summary

Researchers found no significant CP violation in D(0) meson decays into neutral pseudoscalar mesons (π(0), η, η'). The study provides the most precise CP asymmetry measurement for D(0)→K(S)(0)π(0).

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Area of Science:

  • Particle Physics
  • High Energy Physics
  • Quantum Chromodynamics

Background:

  • CP violation is a key concept in particle physics, explaining matter-antimatter asymmetry.
  • D(0) meson decays offer a sensitive probe for subtle CP violation effects.
  • Understanding CP violation in the charm sector is crucial for refining the Standard Model.

Purpose of the Study:

  • To search for CP violation in D(0) decays to K(S)(0)π(0), K(S)(0)η, and K(S)(0)η'.
  • To measure CP asymmetries in these decay channels with high precision.
  • To test the predictions of the Standard Model regarding CP symmetry in charm meson decays.

Main Methods:

  • Analysis of 791 fb(-1) of data from KEKB e(+)e(-) collisions using the Belle detector.
  • Selection of D(0)→K(S)(0)P(0) decay events, where P(0) is π(0), η, or η'.
  • Statistical analysis to determine CP asymmetries and their uncertainties.

Main Results:

  • No significant evidence for CP violation was observed in the studied D(0) decays.
  • The most precise measurement of the CP asymmetry in D(0)→K(S)(0)π(0) was reported: A(CP)=(-0.28±0.19±0.10)%.
  • First measurements of CP asymmetries in D(0)→K(S)(0)η and D(0)→K(S)(0)η' were reported: A(CP)=(+0.54±0.51±0.16)% and A(CP)=(+0.98±0.67±0.14)%, respectively.

Conclusions:

  • The results are consistent with the absence of significant CP violation in these D(0) decays.
  • The high precision measurements provide stringent constraints on potential new physics contributions.
  • Further studies with increased luminosity may enhance sensitivity to CP violation effects.