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We report progress on calculating the $K_L$-$K_S$ mass difference in lattice QCD.
G. Buchalla, A. J. Buras and M. E. Lautenbacher, Weak decays beyond leading logarithms
1996
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RBC Collaboration
2003
Cited alongside, same era.
J. Yu, Long distance contribution to K L K_{L} - K S K_{S} mass difference
2011
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