Non-perturbative QCD effective charges

✍ Scribed by Arlene C. Aguilar; Joannis Papavassiliou

• Book ID: 103868915
• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 440 KB
• Volume: 199
• Category: Article
• ISSN: 0920-5632
• DOI: 10.1016/j.nuclphysbps.2010.02.024

✦ Synopsis

Using gluon and ghost propagators obtained from Schwinger-Dyson equations (SDEs), we construct the nonperturbative effective charge of QCD. We employ two different definitions, which, despite their distinct fieldtheoretic origin, give rise to qualitative comparable results, by virtue of a crucial non-perturbative identity. Most importantly, the QCD charge obtained with either definition freezes in the deep infrared, in agreement with theoretical and phenomenological expectations. The various theoretical ingredients necessary for this construction are reviewed in detail, and some conceptual subtleties are briefly discussed.