B-physics computations from Nf=2 tmQCD

TL;DR

This paper reports precise lattice QCD calculations of B-physics parameters, including quark masses and decay constants, using Nf=2 dynamical configurations and extrapolation techniques from charm to bottom quarks.

Contribution

It provides new, accurate determinations of B-physics quantities using Nf=2 tmQCD with continuum and physical pion mass extrapolations.

Findings

Accurate b-quark mass and decay constants computed.

Bag-parameters for B-meson mixing determined.

Results extrapolated to continuum limit and physical pion mass.

Abstract

We present an accurate lattice QCD computation of the b-quark mass, the B and Bs decay constants, the B-mixing bag-parameters for the full four-fermion operator basis, as well as estimates for \xi and f_{Bq}\sqrt{B_q} extrapolated to the continuum limit and the physical pion mass. We have used Nf = 2 dynamical quark gauge configurations at four values of the lattice spacing generated by ETMC. Extrapolation in the heavy quark mass from the charm to the bottom quark region has been carried out using ratios of physical quantities computed at nearby quark masses, having an exactly known infinite mass limit.