Direct CP Violation in $K_L\toπ^+π^-γ$

Details Direct CP Violation in $K_L\toπ^+π^-γ$ Direct CP Violation in $K_L\toπ^+π^-γ$

1993-05-26

arxiv.org/abs/hep-ph/9305324v1

Phys.Lett.B315:170-178,1993

Physics

High Energy Physics

High Energy Physics - Phenomenology

Latex, 14 pages, ITP-SB-93-32, IP-ASTP-20-93

Scientific paper

10.1016/0370-2693(93)90176-I

CP violation due to interference between $K_L$ and $K_S$ decays into $\pi ^+\pi^-\gamma$ is analyzed in the Standard Model. The CP-violating parameter $\epsilon'_{+- \gamma}$, which is the difference between $\eta_{+-\gamma}$ and $\eta_{+-}$, receives dominant contributions from $K^0-\bar{K}^0$ mixing and the gluon penguin diagram; its magnitude is calculated to be $10^{-2}\epsilon$ at a typical region of the Dalitz plot. Genuine direct CP violation in $K_L\to\pi^+ \pi^-\gamma$ decay originating from the electromagnetic penguin diagram is of order $10^{-4}\epsilon$.

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