pi^0-eta Mixing and CP Violation

Abstract

We discuss ${\pi }^0$ -$\eta$ mixing and its implication for ${ϵ}^{\prime }/ϵ$ to next-to-leading order in the low-energy expansion. The big effect due to $\eta$-${\eta }^{\prime }$ mixing is shown to be largely cancelled by other contributions occurring at the same order in the chiral expansion.

Comments: 8 pages