10-11 July 2014
Queen Mary University of London
GB timezone
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Neutral Kaon Mixing on the Lattice

Presented by Dr. Julien FRISON on 11 Jul 2014 from 11:00 to 11:05
Type: Poster

Summary

Neutral Kaon Mixing plays an important role in indirect CP-violation. Together with the epsilon_K experimental observable from kaon decays, it gives a constraint on the unitarity triangle. After an OPE, the box diagrams involved reduce to a matrix element of a deltaS=2 four quark operator, which can be computed in Lattice QCD at high precision, expressed as the so-called 'Kaon bag parameter'. With the recent progresses made in Lattice QCD, all its errors have fallen to the subpercent level except the systematics from renormalisation. In order to reduce this error we have to renormalise to higher and higher scales, which in turn requires having finer lattices, as well as including additional quark flavours in our simulation. We will present the RBC-UKQCD strategy to do so using our newest Nf=2+1+1 ensembles, and the resulting preliminary result for BK and the epsilon_K band.

Place

Location: Queen Mary University of London
Address: QMUL Mile End Road Campus
Room: Francis Bancroft Building: Mason LT