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Isospin violation in epsilon'.

V Cirigliano1, A Pich, G Ecker

  • 1Departament de Física Teòrica, IFIC, CSIC-Universitat de València, Edifici d'Instituts de Paterna, Apartat Correus 22085, E-46071 València, Spain.

Physical Review Letters
|November 13, 2003
PubMed
Summary

This study analyzes isospin breaking in direct CP violation for K0 to 2 pi decays. Isospin violation corrections to the CP violation parameter epsilon

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Area of Science:

  • Particle Physics
  • Quantum Chromodynamics
  • CP Violation Studies

Background:

  • Understanding CP violation in K0 to 2 pi decays is crucial for testing the Standard Model of particle physics.
  • Isospin symmetry breaking effects are known to influence these decays but require precise theoretical calculations.

Purpose of the Study:

  • To perform the first comprehensive analysis of isospin breaking effects on direct CP violation in K0 to 2 pi decays.
  • To quantify the impact of isospin violation on the CP violation parameter epsilon'.

Main Methods:

  • Employed a next-to-leading-order calculation within the framework of chiral perturbation theory.
  • Investigated three distinct sources contributing to isospin violation.

Main Results:

  • A destructive interference was observed among the three isospin violation sources affecting epsilon'.
  • The calculated isospin violating correction to epsilon' is found to be less than 15%, considering large-N(c) uncertainties.

Conclusions:

  • Isospin breaking introduces a significant, yet quantifiable, correction to direct CP violation in K0 decays.
  • The results provide important constraints for theoretical models and future experimental searches for new physics.

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