Statut  Confirmé 
Série  APCTH 
Domaines  hepth 
Date  Mardi 21 Novembre 2017 
Heure  14:00 
Institut  APC 
Salle  483 A  Malevitch83 A  Malevitch 
Nom de l'orateur  Wschebor 
Prenom de l'orateur  Nicolás 
Addresse email de l'orateur  
Institution de l'orateur  Universidad de la República, Montevideo 
Titre  Infrared QCD: perturbative or non perturbative? 
Résumé  A model suited for calculating correlation functions in QCD from the ultraviolet to the infrared is reviewed. The model consist in standard FaddeevPopov Lagrangian for Landau gauge with an extra mass term for gluons. It is shown that once this mass term is included, two and three point correlation functions can be calculated with good precision at oneloop order even at very low momenta in the quenched approximation. After that, the inclusion of quarks is analyzed. It is shown that in that case, the perturbative calculation only gives the qualitative behavior in some correlation functions. In particular, it is shown that the analysis of spontaneous chiral symmetry breaking requires to go beyond perturbation theory. A non perturbative scheme but controlled by two small parameters is discussed and the corresponding results are shown to agree with high precision to Monte Carlo numerical simulations also in the quark sector. 
Numéro de preprint arXiv  
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