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.
Primary author
Dr
Christopher Kelly
(RBRC, Brookhaven National Laboratory)
Co-author
Mr
Daiqian Zhang
(Columbia University)
