Determination of Re(ɛ’/ɛ) by the simultaneous detection of the four <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi mathvariant="italic">K</mi></mrow><mrow><mi mathvariant="italic">L</mi><mo>,</mo></mrow></msub></mrow></math>S→ππ decay modes

doi:10.1103/PhysRevLett.64.1491

Determination of Re(ɛ’/ɛ) by the simultaneous detection of the four $K_{L,}$ S→ππ decay modes

J. R. Patterson et al.

Phys. Rev. Lett. 64, 1491 – Published 26 March 1990

Abstract

The E731 experiment at Fermilab has searched for direct CP violation in $K^{0}$ →ππ, which is parametrized by ɛ’/ɛ. For the first time all four of the $K_{L,}$ S→ππ modes were collected simultaneously, which greatly facilitated studies of systematic uncertainty. We find Re(ɛ’/ɛ)=-0.0004±0.0014(stat)±0.0006(syst). The result provides no evidence for direct CP violation.