An observation of direct-CP violation - ?′/? result from KTeV
Journal
Nuclear Physics B - Proceedings Supplements
Journal Volume
86
Journal Issue
1-3
Pages
312-321
Date Issued
2000
Author(s)
Abstract
We report the first KTeV measurement for the search of direct-CP violation by using 23% of the data sample collected in the 1996-97 fixed target run at Fermilab. The result is, Re(∈′/∈) = (28.0 ± 4.1) × 10-4, nearly 7σ above zero obtained by a blind analysis. This firmly establishes the long-sought "direct-CP violation" effect in the two-pion system (π+π- versus π0π0) of neutral kaon decays. Other new measurements of Δℳ, τs, Δ∅ and a limit on the diurnal variation of ∅+- for testing CPT invariance from the same data sample are also presented.
SDGs
Type
journal article