M_b and f_B from non-perturbatively renormalized HQET with Nf=2 light quarks

TL;DR

This paper provides an improved non-perturbative determination of the b-quark mass and B meson decay constant using lattice QCD with two dynamical light quarks, enhancing the accuracy of these fundamental parameters.

Contribution

It introduces an updated analysis incorporating additional light quark masses and lattice spacings, and employs HQET with non-perturbative coefficients for precise matching to QCD.

Findings

Refined values for b-quark mass and B meson decay constant.

Enhanced chiral and continuum extrapolations.

Improved non-perturbative matching techniques.

Abstract

We present an updated analysis of the non-perturbatively renormalized b-quark mass and B meson decay constant based on CLS lattices with two dynamical non-perturbatively improved Wilson quarks. This update incorporates additional light quark masses and lattice spacings in large physical volume to improve chiral extrapolations and to reach the continuum limit. We use Heavy Quark Effective Theory (HQET) including 1/m_b terms with non-perturbative coefficients based on the matching of QCD and HQET developed by the ALPHA collaboration during the past years.