Otro
The temperature dependence of the QCD running coupling
Registro en:
Brazilian Journal of Physics, v. 36, n. 2 B, p. 582-585, 2006.
0103-9733
10.1590/S0103-97332006000400020
S0103-97332006000400020
WOS:000239338500020
2-s2.0-33749506461.pdf
2-s2.0-33749506461
Autor
Steffens, F. M.
Resumen
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.