QCD fixed points: Banks-Zaksscenario or dynamical gluon mass generation?

Autor(es)

Gomez, J. D. ; Natale, A. A.

• Tipo de documento: Artigo Científico
• Fonte: International Journal of Modern Physics A; v. 32, n. 2-3 JAN 30 2017.
• Citações Web of Science: 0

Resumo

Fixed points in QCD can appear when the number of quark flavors (N-f) is increased above a certain critical value as proposed by Banks and Zaks (BZ). There is also the possibility that QCD possess an effective charge indicating an infrared frozen coupling constant. In particular, an infrared frozen coupling associated to dynamical gluon mass (DGM) generation does lead to a fixed point even for a small number of quarks. We compare the BZ and DGM mechanisms, their beta functions and fixed points, and within the approximations of this work, which rely basically on extrapolations of the dynamical gluon masses at large N-f, we verify that between N-f=8 and N-f=12 both cases exhibit fixed points at similar coupling constant values (g{*}). We argue that the states of minimum vacuum energy, as a function of the coupling constant up to g{*} and for several Nf values, are related to the dynamical gluon mass generation mechanism (AU)

• Processo FAPESP: 13/22079-8 - Física de partículas e campos: modelo padrão e suas extensões
• Beneficiário: Adriano Antonio Natale
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 13/24065-4 - Fenomenologia da interação forte
• Beneficiário: John David Gomez Aguirre
• Modalidade de apoio: Bolsas no Brasil - Doutorado