English

Thompson's renormalization group method applied to QCD at high energy scale

High Energy Physics - Phenomenology 2016-04-08 v1

Abstract

We use a renormalization group method to treat QCD-vacuum behavior specially closer to the regime of asymptotic freedom. QCD-vacuum behaves effectively like a "paramagnetic system" of a classical theory in the sense that virtual color charges (gluons) emerges in it as a spin effect of a paramagnetic material when a magnetic field aligns their microscopic magnetic dipoles. Due to that strong classical analogy with the paramagnetism of Landau's theory,we will be able to use a certain Landau effective action without temperature and phase transition for just representing QCD-vacuum behavior at higher energies as being magnetization of a paramagnetic material in the presence of a magnetic field HH. This reasoning will allow us to apply Thompson's approach to such an action in order to extract an "effective susceptibility" (χ>0\chi>0) of QCD-vacuum. It depends on logarithmic of energy scale uu to investigate hadronic matter. Consequently we are able to get an ``effective magnetic permeability" (μ>1\mu>1) of such a "paramagnetic vacuum". Actually,as QCD-vacuum must obey Lorentz invariance,the attainment of μ>1\mu>1 must simply require that the "effective electrical permissivity" is ϵ<1\epsilon<1 in such a way that μϵ=1\mu\epsilon=1 (c2=1c^2=1). This leads to the anti-screening effect where the asymptotic freedom takes place. We will also be able to extend our investigation to include both the diamagnetic fermionic properties of QED-vacuum (screening) and the paramagnetic bosonic properties of QCD-vacuum (anti-screening) into the same formalism by obtaining a β\beta-function at 1 loop,where both the bosonic and fermionic contributions are considered.

Keywords

Cite

@article{arxiv.0708.2167,
  title  = {Thompson's renormalization group method applied to QCD at high energy scale},
  author = {Claudio Nassif and J. A. Helayel-Neto and P. R. Silva},
  journal= {arXiv preprint arXiv:0708.2167},
  year   = {2016}
}

Comments

13 pages, no figures and 28 references. arXiv admin note: substantial text overlap with arXiv:0706.2553

R2 v1 2026-06-21T09:07:54.252Z