K_L-K_S mass difference from Lattice QCD · arXivDesk
1312.0306Dec 2, 20137 pages, 5 figures, presented at the 31st International Symposium on Lattice Field Theory (Lattice 2013), 29 July - 3 August 2013, Mainz, Germany
We will report on the first full calculation of the KL−KS mass difference in lattice QCD. The calculation is performed on a 2+1 flavor, domain wall fermion, 243×64
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ensemble with a 329 MeV pion mass and a 575 MeV kaon mass. Both double penguin diagrams and disconnected diagrams are included in this calculation. The calculation is made finite through the GIM mechanism by introducing a 949 MeV valence charm quark. While the double penguin diagrams contribute a very small fraction to the mass difference, there is a large cancellation between disconnected diagrams and other types of diagrams. We obtain the mass difference