Theory Seminar

Theory Seminar(Dr. Christopher Kelly)

Start:2015/10/30 (Fri) 11:00 AM
End:2015/10/30 (Fri) 12:00 PM
Location:Kenkyu Honkan 3F Seminar Room

Speaker:Dr. Christopher Kelly (RBRC Brookhaven National Laboratory)
Lecture:Standard-model prediction for direct CP violation in K -> pi pi decay


We discuss our recent publication (arXiv:1505.07863 [hep-lat]) 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.

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