We present precise tests of CP and CPT symmetry based on the full data set of K→ππ decays collected by the KTeV experiment at Fermi National Accelerator Laboratory during 1996, 1997, and 1999. This data set contains 16×106 K→π0π0 and 69×106 K→π+π - decays. We measure the direct CP violation parameter Re(ε′/ε)=(19.2±2.1)×10-4. We find the KL-KS mass difference Δm=(5270±12) ×106hs-1 and the KS lifetime τS=(89. 62±0.05)×10-12s. We also measure several parameters that test CPT invariance. We find the difference between the phase of the indirect CP violation parameter ε and the superweak phase: φε- φSW=(0.40±0.56)°. We measure the difference of the relative phases between the CP violating and CP conserving decay amplitudes for K→π+π- (φ+-) and for K→π0π0 (φ00): Δφ=(0.30±0.35)°. From these phase measurements, we place a limit on the mass difference between K0 and K̄0: ΔM<4.8×10-19GeV/c2 at 95% C.L. These results are consistent with those of other experiments, our own earlier measurements, and CPT symmetry.
|Original language||English (US)|
|Journal||Physical Review D - Particles, Fields, Gravitation and Cosmology|
|State||Published - May 5 2011|
ASJC Scopus subject areas
- Nuclear and High Energy Physics
- Physics and Astronomy (miscellaneous)