B-parameters of 4-fermion operators from lattice QCD
نویسندگان
چکیده
منابع مشابه
B-parameters of 4-fermion operators from lattice QCD
Reliable estimates of the matrix elements of 4-fermion operators between hadronic states are essential in order to quantify strong interaction corrections to weak processes. Here we report on calculations of mixing elements of (i) ∆s = 2 operators between K and K̄0 states (BK) that arise in the calculation of the CP violation parameter ǫ. The value of BK is an essential input in pinning down the...
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We have studied lattice QCD with an additional, irrelevant 4-fermion interaction having a U(1)×U(1) chiral symmetry, at finite temperatures. Adding this 4-fermion term allowed us to work at zero quark mass, which would have otherwise been impossible. The theory with 2 massless staggered quark flavours appears to have a first order finite temperature phase transition at Nt = 4 for the value of 4...
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We compute on the lattice the “bag” parameters of the five ∆B = 2 operators of the supersymmetric basis, by combining their values determined in full QCD and in the static limit of HQET. The extrapolation of the QCD results from the accessible heavy-light meson masses to the B-meson mass is constrained by the static result. The matching of the corresponding results in HQET and in QCD is for the...
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We perform a non-perturbative study of the scale-dependent renormalization factors of a multiplicatively renormalizable basis of ∆B = 2 parity-odd four-fermion operators in quenched lattice QCD. Heavy quarks are treated in the static approximation with various lattice discretizations of the static action. Light quarks are described by nonperturbatively O(a) improved Wilson-type fermions. The re...
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We present results of a large-scale simulation for the Kaon B parameter BK in quenched lattice QCD with the Kogut-Susskind quark action. Calculating BK at 1% statistical accuracy for seven values of lattice spacing in the range a ≈ 0.24 − 0.04 fm on lattices up to 563 × 96, we verify a quadratic a dependence of BK theoretically predicted. Strong indications are found that, with our level of acc...
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ژورنال
عنوان ژورنال: Nuclear Physics B - Proceedings Supplements
سال: 1998
ISSN: 0920-5632
DOI: 10.1016/s0920-5632(97)00745-7