Speaker
Dr
Christopher Kelly
(RBRC, Brookhaven National Laboratory)
Description
We discuss our recent publication [arXiv:1505.07863] of the first lattice QCD calculation of the complex kaon decay amplitude A_0 with physical kinematics, using a single 32^3 x 64 domain wall ensemble with G-parity spatial boundary conditions. We obtain approximate agreement with the experimental value for Re(A_0), which serves as a test of our method. Our prediction of Im(A_0) can be used to compute the direct CP violating ratio Re(ε′/ε), which we find to be ~2 sigma lower than the experimental value. This result provides a new test of the Standard Model theory of CP violation, one which can be made more accurate with increasing computer capability.
Author
Dr
Christopher Kelly
(RBRC, Brookhaven National Laboratory)
Co-author
Mr
Daiqian Zhang
(Columbia University)
