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We present preliminary results of matching factors of the four-fermion operators relevant to $B_K$, which are obtained using the non-perturbative renormalization (NPR) method in the RI-MOM scheme with HYP-smeared improved staggered fermions.
- We use the MILC asqtad coarse ($a \cong 0.12\,$fm) ensembles with $20^3 \times 64$ geometry and $am_{\ell}/am_s = 0.01/0.05$.
- We compare NPR results with those of one-loop perturbative matching.
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S. Weinberg Phys.Rev
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W. Lee UMI-96-06917-mc (microfiche) 1995
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