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Precision computation of B_K in quenched lattice QCD

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arxiv hep-lat/0409026 v1 pith:BAABV7VU submitted 2004-09-08 hep-lat

P. Dimopoulos , J. Heitger , C. Pena , S. Sint , A. Vladikas This is my paper · ORCID
classification hep-lat
keywords computationmassdifferentextrapolationslatticeprecisionresultsavailable
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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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