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)

Thursday 25 Jun 2020, 15:00 → 17:00 US/Eastern

I discuss our recent publication [arXiv:2004.09440] of a lattice QCD calculation of the $\mathrm{\Delta }I=1/2$, $K\to \pi \pi$ decay amplitude $A_0$ and ${ϵ}^{\prime }$, 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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