Measurements of direct CP violation, CPT symmetry, and other parameters in the neutral kaon system.

摘要

We present precision measurements of the direct CP violation parameter, Re(epsilon'epsilon), the kaon parameters, Deltam and tau S, and the CPT tests, &phis;+- and Delta&phis;, 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 → pi 0pi0 decays and ∼69 million K → pi +pi- decays. We describe significant improvements to the precision of these measurements relative to previous KTeV analyses. We find Re(epsilon'/epsilon) = [19.2 +/-1.1(stat ) +/- 1.8(syst)] x 10-4, Delta m = (5265 +/- 10) x106 hs-1, and tauS = (89.62 +/- 0.05) x10 -12 s. We measure &phis;+- = (44.09 +/- 1.00)° and Delta&phis; = (0.29 0.31)°; these results are consistent with CPT symmetry.