An Estimate of the K0-K0bar Mixing Amplitude
Damir Becirevic, Davide Meloni, Alessandra Retico
TL;DR
This paper presents lattice QCD calculations of the B_K parameter to estimate the K0-K0bar mixing amplitude, comparing quenched and unquenched results to assess systematic errors.
Contribution
First non-perturbative lattice calculation of B_K using improved Wilson action with comparison between quenched and unquenched simulations.
Findings
B_K=0.73(7)^{+0.05}_{-0.01} at mu=2 GeV in MSbar scheme
No significant difference between quenched and unquenched results
Systematic errors estimated from comparison
Abstract
We computed the B_K parameter on the lattice by using a non-perturbatively improved Wilson action. From our quenched simulation, in the MSbar scheme and at mu=2 GeV, we obtain B_K=0.73(7)^{+0.05}_{-0.01}. To gain some insight in the systematic errors due to the use of the quenched approximation, we also made the unquenched computation with Wilson fermions. We do not observe any significant deviation with respect to the quenched result.
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