Sea quark effects in B_K from N_f=2 clover-improved Wilson fermions

Details Sea quark effects in B_K from N_f=2 clover-improved Wilson fermions Sea quark effects in B_K from N_f=2 clover-improved Wilson fermions

2004-06-09

arxiv.org/abs/hep-lat/0406013v2

JHEP 0411:049,2004

Physics

High Energy Physics

High Energy Physics - Lattice

17 pages, 4 figures, uses JHEP3.cls, added comments and references

Scientific paper

10.1088/1126-6708/2004/11/049

We report calculations of the parameter B_K appearing in the Delta S=2 neutral kaon mixing matrix element, whose uncertainty limits the power of unitarity triangle constraints for testing the standard model or looking for new physics. We use two flavours of dynamical clover-improved Wilson lattice fermions and look for dependence on the dynamical quark mass at fixed lattice spacing. We see some evidence for dynamical quark effects and in particular B_K decreases as the sea quark masses are reduced towards the up/down quark mass.

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