Measurements of Direct CP Violation, CPT Symmetry, and Other Parameters in the Neutral Kaon System

The authors present precision measurements of the direct CP violation parameter, Re(ε(prime)/ε), the kaon parameters, Δm and τS, and the CPT tests, φ± and Δφ, in neutral kaon decays. These results are based on the full dataset collected by the KTeV experiment at Fermi National Accelerator Laboratory during 1996, 1997, and 1999. This dataset contains ∼ 15 million K → π0π0 decays and ∼ 69 million K → π+π- decays. They describe significant improvements to the precision of these measurements relative to previous KTeV analyses. They find Re(ε(prime)/ε) = [19.2 ± 1.1(stat) ± 1.8(syst)] x 10-4, Δm = (5265 ± 10) x 106 hs-1, and τS = (89.62 ± 0.05) x 10-12 s. They measure φ± = (44.09 ± 1.00)o and Δφ = (0.29 ± 0.31)o; these results are consistent with CPT symmetry