Precision computation of B_K in quenched lattice QCD

Details Precision computation of B_K in quenched lattice QCD Precision computation of B_K in quenched lattice QCD

2004-09-08

arxiv.org/abs/hep-lat/0409026v1

Physics

High Energy Physics

High Energy Physics - Lattice

3 pages, 3 figures, talk presented at Lattice2004(weak), Fermilab, June 21-26, 2004

Scientific paper

We present the results of a precision computation of B_K with Wilson fermions. Simulations are performed at different lattice spacings, enabling continuum limit extrapolations. Two different twisted mass QCD (tmQCD) regularisations are considered for the computation of bare matrix elements. In both cases the relevant four-fermion operator renormalises multiplicatively. In one regularisation it is possible to perform the computation directly at the physical kaon mass value, thus avoiding extrapolations in the mass. Nonperturbative renormalisation is carried out using available Schroedinger Functional results.

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