Speaker
Vicent Mateu Barreda
(University of Vienna)
Description
We present determinations of the MS-bar charm quark mass using relativistic QCD sum rules at O(as^3) from the moments of the vector and the pseudoscalar current correlators. Our analysis of the theoretical uncertainties is based on different implementations of the perturbative series and on independent variations of the renormalization scales for the mass and the strong coupling. We address the issue that double scale variation could overestimate the perturbative uncertainties by supplementing the analysis with a test that quantifies the convergence rate of each perturbative series by a single number. We find that this convergence test allows to determine an overall and average convergence rate that is characteristic for the series expansions of each moment, and to discard those series for which the convergence rate is significantly worse. The method is also applied to the extraction of the MS-bar bottom quark mass from the vector correlator. We compute the experimental moments including a modeling uncertainty associated to the continuum region where no data is available.
Author
Vicent Mateu Barreda
(University of Vienna)
Co-authors
Andre Hoang
(U)
Mr
Bahman Dehnadi
(University of Vienna)
