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ΔI=3/2 and ΔI=1/2 channels of K→ππ decay at the physical point with periodic boundary conditions

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Blum, Thomas ; Boyle, Peter A. ; Hoying, Daniel ; Izubuchi, Taku ; Jin, Luchang ; Jung, Chulwoo ; Kelly, Christopher ; Lehner, Christoph ; Soni, Amarjit ; Tomii, Masaaki
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Date of publication of this fulltext: 09 Feb 2024 06:39


We present a lattice calculation of the K→ππ matrix elements and amplitudes with both the ΔI=3/2 and 1/2 channels and ϵ′, the measure of direct CP violation. We use periodic boundary conditions (PBC), where the correct kinematics of K→ππ can be achieved via an excited two-pion final state. To overcome the difficulty associated with the extraction of excited states, our previous work [Z. Bai et ...


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