K0-K0bar mixing from the Schroedinger functional and twisted mass QCD

Details K0-K0bar mixing from the Schroedinger functional and twisted mass QCD K0-K0bar mixing from the Schroedinger functional and twisted mass QCD

2001-10-15

arxiv.org/abs/hep-lat/0110097v2

Nucl.Phys.Proc.Suppl. 106 (2002) 320-322

Physics

High Energy Physics

High Energy Physics - Lattice

Lattice2001(matrixelement); 3 pages, 1 eps figure. Two misprints corrected

Scientific paper

We describe how the Schroedinger functional and twisted mass QCD can be used to compute the kaon B-parameter B_K on the lattice with Wilson fermions. This new approach is expected to reduce the systematic uncertainties on B_K through a better control of its (nonperturbative) renormalisation. Preliminary results for the bare matrix element in a physical volume of (1.5^3 x 4.5) fm^4 are presented. The renormalisation of the matrix element in a Schroedinger functional scheme is also discussed.

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