Abstract
We present new results for the renormalisation and subtraction constants for the four fermionΔ F = 2 operators, computed non-perturbatively in the RI-MOM scheme (in the Landau gauge). From our preliminary analysis of the lattice data at β = 6.45, for the B 0 − B¯ 0 mixing bag-parameter we obtain B B RGI = 1.46(7)(1).
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