B-parameters of the complete set of matrix elements of (Delta B = 2) operators from the lattice

TL;DR

This paper calculates B-parameters for all (Delta B = 2) operators using lattice QCD, combining full QCD and static HQET results, with NLO matching, to improve understanding of B-meson mixing.

Contribution

It provides the first NLO accuracy matching of lattice QCD and HQET results for B-parameters in the quenched approximation.

Findings

Computed bag parameters for five (Delta B = 2) operators.

Combined full QCD and static HQET results for B-meson mass extrapolation.

Performed NLO matching in MSbar(NDR) scheme.

Abstract

We compute on the lattice the ``bag'' parameters of the five (Delta 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 first time made at NLO accuracy in the MSbar(NDR) renormalization scheme. All results are obtained in the quenched approximation.