Quark Condensate from Renormalization Group Optimized Spectral Density Auteur(s): Kneur J.-L., Neveu A. (Article) Publié: Nuclear Physics B - Proceedings Supplements, vol. 270 p.98-102 (2016) Texte intégral en Openaccess : Ref HAL: hal-01264155_v1 Ref Arxiv: 1512.03406 DOI: 10.1016/j.nuclphysbps.2016.02.021 WoS: WOS:000375626800021 Ref. & Cit.: NASA ADS Exporter : BibTex | endNote Résumé: Our renormalization group consistent variant of optimized perturbation, RGOPT, is used to calculate the nonperturbative QCD spectral density of the Dirac operator and the related chiral quark condensate $\langle \bar q q \rangle$, for $n_f=2$ and $n_f=3$ massless quarks. Sequences of approximations at two-, three-, and four-loop orders are very stable and give $\langle \bar q q \rangle^{1/3}_{n_f=2}(2\, {\rm GeV}) = -(0.833-0.845) \bar\Lambda_2 $, and $ \langle \bar q q \rangle^{1/3}_{n_f=3}(2\, {\rm GeV}) = -(0.814-0.838) \bar\Lambda_3 $ where the range is our estimated theoretical error and $\bar\Lambda_{n_f}$ the basic QCD scale in the $\rm \bar{MS}$-scheme. We compare those results with other recent determinations (from lattice calculations and spectral sum rules). Commentaires: 5 pages, talk given at 18th International Conference in Quantum Chromodynamics (QCD 15) Montpellier, published in the proceedings |