%0 Journal Article
%T Neutral kaon mixing from new physics: matrix elements in $N_f=2+1$ QCD
%A Taegil Bae
%A Yong-Chull Jang
%A Hwancheol Jeong
%A Chulwoo Jung
%A Hyung-Jin Kim
%A Jangho Kim
%A Jongjeong Kim
%A Kwangwoo Kim
%A Sunghee Kim
%A Weonjong Lee
%A Jaehoon Leem
%A Stephen R. Sharpe
%A Boram Yoon
%A SWME Collaboration
%J Physics
%D 2013
%I arXiv
%R 10.1103/PhysRevD.88.071503
%X We present results for matrix elements of $\Delta S=2$ four-fermion operators arising generically in models of new physics. These are needed to constrain such models using the measured values of $\varepsilon_K$ and $\Delta M_K$. We use lattice QCD with 2+1 flavors of improved staggered fermions on lattices generated by the MILC collaboration. We extrapolate to the continuum from three lattice spacings ranging down to $a\approx 0.045\;$fm. Total errors are $\sim 5-6%$, arising primarily from our use of one-loop matching between lattice and continuum operators. For two of the matrix elements, our results disagree significantly from those obtained using different fermion discretizations.
%U http://arxiv.org/abs/1309.2040v3