Abstract

The first measurement of direct CP violation parameter Re( ϵ′ ϵ ) from the KTeV experiment at Fermilab is presented in this paper. Using a subset of data collected in 1996 and in 1997 we find that Re( ϵ′ ϵ ) = [28.0 ± 3.0(stat) ± 2.8(syst)] × 10 −4 [1].

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