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We compute O(alpha_s) lattice-to-continuum perturbative matching coefficientsfor the Delta S=2 flavor changing four-quark operators for the Asqtad improvedstaggered action. In conjunction with lattice simulations with three flavors oflight, dynamical quarks, our results yield an unquenched determination of B_K,the parameter that determines the amount of indirect CP violation in theneutral kaon system. Its value is an important input for the unitarity triangleanalysis of weak decays.Comment: 11 pages, 2 figure

physical review. d. particles, fields, gravitation, and cosmology/physical review. d, particles, fields, gravitation, and cosmology

One-loop matching of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>Δ</mml:mi><mml:mi>S</mml:mi><mml:mo>=</mml:mo><mml:mn>2</mml:mn></mml:math>four-quark operators with improved staggered fermions

One-loop matching ofΔS=2four-quark operators with improved staggered fermions