Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2005-12-22
Phys.Rev.Lett. 97 (2006) 092301
Physics
High Energy Physics
High Energy Physics - Phenomenology
4 pages, published version
Scientific paper
10.1103/PhysRevLett.97.092301
We study the low energy behavior of QCD Green functions in the limit that the baryon chemical potential is much larger than the QCD scale parameter $\Lambda_QCD$. We show that there is a systematic low energy expansion in powers of $(\omega/m)^{1/3}$, where $\omega$ is the energy and $m$ is the screening scale. This expansion is valid even if the effective quark-gluon coupling $g$ is not small. The expansion is purely perturbative in the magnetic regime $|\vec{k}| \gg k_0$. If the external momenta and energies satisfy $k_0 \sim |\vec{k}|$, planar, abelian ladder diagrams involving the full quark propagator have to be resummed but the corresponding Dyson-Schwinger equations are closed.
Schafer Thomas
Schwenzer Kai
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