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Particle Physics Seminars at BNL

# Direct CP violation and the Delta I=1/2 rule in K to pi pi decay from the Standard Model

## by Christopher Kelly (Brookhaven National Laboratory)

US/Eastern
Description

I discuss our recent publication [arXiv:2004.09440] of a lattice QCD calculation of the $\Delta I=1/2$, $K\to\pi\pi$ decay amplitude $A_0$ and $\epsilon'$, the measure of direct CP-violation in $K\to\pi\pi$ decay. This quantity is highly sensitive to new sources of CP violation that might help to explain the matter/antimatter asymmetry in the observable Universe. This calculation dramatically improves on our 2015 results [Phys.Rev.Lett. 115 (2015) 21, 212001], including nearly four times the statistics and numerous technical improvements allowing us to more reliably isolate the $\pi\pi$ ground-state and more accurately relate the lattice operators to those defined in the Standard Model.

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