B meson spectrum and decay constant from Nf=2 simulations

TL;DR

This paper discusses the progress in calculating B meson properties using Nf=2 lattice simulations within HQET, providing initial results for the b-quark mass and decay constant.

Contribution

It introduces a new approach combining Nf=2 lattice simulations and HQET to determine B meson properties with initial results for key parameters.

Findings

First results for b-quark mass

Initial decay constant measurements

Progress in HQET matching conditions

Abstract

We report on the status of an ALPHA Collaboration project to extract quantities for B physics phenomenology from Nf=2 lattice simulations. The framework is Heavy Quark Effective Theory (HQET) expanded up to the first order of the inverse b-quark mass. The couplings of the effective theory are determined by imposing matching conditions of observables computed in HQET with their counterpart computed in QCD. That program, based on Nf=2 simulations in a small physical volume with SF boundary conditions, is now almost finished. On the other side the analysis of configurations selected from the CLS ensembles, in order to measure HQET hadronic matrix elements, has just started recently so that only results obtained at a single lattice spacing, a=0.07 fm, will be discussed. We give our first results for the b-quark mass and for the B meson decay constant.