Theoretical strategies for epsilon'/epsilon

Abstract

We review the current status of calculations of the two pion decays of the kaon using the first-principles methods of lattice gauge theory and the significant challenges that these calculations pose. While a calculation with controlled errors at even the 10-20% level has not yet been performed, present results suggest that such a calculation of the real and imaginary parts of the Delta I = 3/2 amplitude should be accomplished within the next two years. The more difficult Delta I = 1/2 amplitude may also be now within reach.

Presented at 2009 KAON International Conference (KAON09), June 09-12, 2009 in Tsukuba, Japan. 9 pages, 8 figures