K0-K0bar mixing from the Schroedinger functional and twisted mass QCD
M.Guagnelli, J.Heitger, C.Pena, S.Sint, A.Vladikas
TL;DR
This paper presents a novel lattice QCD approach using the Schroedinger functional and twisted mass fermions to compute the kaon B-parameter B_K, aiming to reduce systematic uncertainties through improved nonperturbative renormalisation.
Contribution
It introduces a new method combining Schroedinger functional and twisted mass QCD for more accurate B_K calculations with Wilson fermions.
Findings
Preliminary results for the bare matrix element are provided.
Discussion on the renormalisation of the matrix element in the Schroedinger functional scheme.
Expected reduction in systematic uncertainties on B_K.
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.
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