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1.
Phys Rev Lett ; 97(21): 212301, 2006 Nov 24.
Artigo em Inglês | MEDLINE | ID: mdl-17155739

RESUMO

It is shown that at a large temperature and E --> infinity the QCD collisional energy loss reads dE/dx approximately alpha(m(D)2)T2. Compared to previous approaches, which led to dE(B)/dx approximately alpha2 T2 ln(ET/m(D)2) similar to the Bethe-Bloch formula in QED, we take into account the running of the strong coupling. As one significant consequence, due to asymptotic freedom, dE/dx becomes E independent for large parton energies. Some implications with regard to heavy ion collisions are pointed out.

2.
Phys Rev Lett ; 94(17): 172301, 2005 May 06.
Artigo em Inglês | MEDLINE | ID: mdl-15904282

RESUMO

We study properties of a gluon plasma above the critical temperature Tc in a generalized quasiparticle approach with a Lorentz spectral function. The model parameters are determined by a fit of the entropy s to lattice QCD data. The effective degrees of freedom are found to be rather heavy and of a sizable width. With the spectral width being closely related to the interaction rate, we find a large effective cross section, which is comparable to the typical distance squared of the quasiparticles. This suggests that the system should be viewed as a liquid as also indicated by an estimate of the plasma parameter Gamma. Furthermore, within the quasiparticle approach we find a very low viscosity to entropy ratio, eta/s approximately 0.2 for T > 1.05 Tc, supporting the recent conjecture of an almost ideal quark-gluon liquid seen at RHIC.

3.
Phys Rev Lett ; 84(5): 841-4, 2000 Jan 31.
Artigo em Inglês | MEDLINE | ID: mdl-11017386

RESUMO

Under very general assumptions we show that the quark dispersion relation in the quark-gluon plasma is given by two collective branches, of which one has a minimum at a nonvanishing momentum. This general feature of the quark dispersion relation leads to structures (van Hove singularities, gaps) in the low mass dilepton production rate, which might provide a unique signature for the quark-gluon plasma formation in relativistic heavy ion collisions.

4.
Phys Rev D Part Fields ; 54(3): 2399-2402, 1996 Aug 01.
Artigo em Inglês | MEDLINE | ID: mdl-10020920
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