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

Abstract

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.

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

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Cited by in corpus (7)

• Chirally improving Wilson fermions - I. O(a) improvement
• Chirally improving Wilson fermions II. Four-quark operators
• Twisted mass lattice QCD
• Twisted mass QCD and lattice approaches to the $\Delta I=1/2$ rule
• Non-perturbative renormalization of static-light four-fermion operators in quenched lattice QCD
• Non-perturbative renormalization of left-left four-fermion operators in quenched lattice QCD
• Wilson-like fermions and the static B_B parameter with no chirality breaking mixings