New Charm and Bottom Quark Mass Determinations from QCD Sum Rules

Bahman Dehnadi (Corresponding author), Andre H. Hoang, Vicent Mateu Barreda

Publications: Contribution to journalArticlePeer Reviewed

Abstract

In this talk we discuss results of a new extraction of the MS charm quark mass using relativistic QCD sum rules at O(αs3) based on moments of the vector and the pseudoscalar current correlators, and using the available experimental measurements from e +e - collisions and lattice results, respectively. The analysis of the perturbative 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, following a work we carried out earlier. Accounting for the perturbative series that result from this double scale variation is crucial, since some of the series can exhibit extraordinarily small scale dependence, if the two scales are set equal. The new aspect of the work reported here addresses the problem that double scale variation might also lead to an overestimate of the perturbative uncertainties. We supplement the analysis by a convergence test that allows to quantify the overall convergence of QCD perturbation theory for each moment, and to discard series that are artificially spoiled by specific choices of the renormalization scales. We also apply the new method to an extraction of the MS bottom quark mass using experimental moments that account for a modeling uncertainty associated to the continuum region where no experimental data is available. We obtain mc(mc)=1.288±0.020 GeV and mb(mb)=4.176±0.023 GeV.

Original languageEnglish
Pages (from-to)113-117
Number of pages5
JournalNuclear and Particle Physics Proceedings
Volume270-272
DOIs
Publication statusPublished - 2016
Event18th Montpellier International Conference on Quantum Chromodynamics (QCD) - Montpellier, France
Duration: 29 Jun 20153 Jul 2015

Austrian Fields of Science 2012

  • 103024 Quantum field theory

Keywords

  • Charm Mass
  • Bottom Mass
  • Perturbative QCD
  • QCD Sum Rules
  • VACUUM POLARIZATION FUNCTION
  • O(ALPHA(3)(S))
  • MOMENTS

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