The temperature dependence of the QCD running coupling
Tipo
Artigo de evento
Data de publicação
2006
Periódico
Brazilian Journal of Physics
Citações (Scopus)
9
Autores
Steffens F.M.
Orientador
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ISSN da Revista
Título de Volume
Membros da banca
Programa
Resumo
We study the running of the QCD coupling with the momentum squared (Q 2) and the temperature scales in the high temperature limit (T > Tc), using a mass dependent renormalization scheme to build the Renormalization Group Equations. The approach used guaranty gauge invariance, through the use of the Hard Thermal Loop approximation, and independence of the vertex chosen to renormalize the coupling. In general, the dependence of the coupling with the temperature is not logarithmical, although in the region Q2 ∼ T2 the logarithm approximation is reasonable. Finally, as known from Debye screening, color charge is screened in the coupling. The number of flavors, however, is anti-screened.