281 research outputs found
Hard parton damping in hot QCD
The gluon and quark collisional widths in hot QCD plasmas are discussed with
emphasis on temperatures near Tc, where the coupling is large. Considering the
effect on the entropy, which is known from lattice calculations, it is argued
that the width of the partons, which in the perturbative limit is given by
gamma ~ g^2 ln(1/g) T, should be sizeable at intermediate temperatures but has
to be small close to Tc. This behavior implies a substantial reduction of the
radiative energy loss of jets near Tc.Comment: invitetd talk given at 'Hot Quarks 04', July 18-24 2004, Taos Valley,
NM, US
Resummation of the QCD thermodynamic potential
It is argued why thermodynamic approximations in terms of dressed propagators
may, at larger coupling strength, be better behaved than perturbative results,
and why in hot QCD the hard thermal loop approximation of the thermodynamic
potential cannot be expected to work close to the phase transition.Comment: 5 pages. Talk given at `Statistical QCD', Bielefeld, August 26-30,
200
Collisional jet quenching becomes probable
It was argued recently that loop corrections to tree-level amplitudes are
essential in the discussion of the collisional energy loss of energetic partons
in the hot quark gluon plasma: Instead of , as first derived by Bjorken (assuming a constant ), the
mean energy loss actually behaves as .
Here we calculate, within this resummation-improved framework, the probability
distribution functions (`quenching weights') of the collisional energy loss.
First results from a Monte Carlo implementation of this probabilistic
collisional quenching shed new light on the interpretation of jet suppression
in heavy ion collisions.Comment: 5 figure
The QCD equation of state near T_0 within a quasi-particle model
We present a description of the equation of state of strongly interacting
matter within a quasi-particle model. The model is adjusted to lattice QCD data
near the deconfinement temperature . We compare in detail the excess
pressure at non-vanishing chemical potential and its expansion coefficients
with two-flavor lattice QCD calculations and outline prospects of the
extrapolation to large baryon density
Turning on the Charm
We argue that the strong jet quenching of heavy flavors observed in heavy-ion
collisions is to a large extent due to binary scatterings in the quark-gluon
plasma. It can be understood from first principles: the charm collision
probability beyond logarithmic accuracy and Markov evolution.Comment: 4 pages, 5 figure
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