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We review the properties of energetic parton propagation in hot or cold QCD matter, as obtained in recent works. Advances in understanding the energy loss collisional and radiative are summarized, with emphasis on the latter: it features very interesting properties which may help to detect the quark-gluon plasma produced in heavy ion collisions. We describe… (More)

The medium induced energy loss spectrum of a high energy quark or gluon traversing a hot QCD medium of finite volume is studied. We model the interaction by a simple picture of static scattering centres. The total induced energy loss is found to grow as L, where L is the extent of the medium. The solution of the energy loss problem is reduced to the… (More)

- Rolf Baier
- 1994

Soft gluon radiation induced by multiple scattering of a fast quark or gluon propagating through QCD matter is discussed. After revisiting the Landau-Pomeranchuk-Migdal effect in QED we show that large formation times of bremsstrahlung quanta determine the QCD radiation intensity (in analogy to QED) and derive the gluon energy spectrum. Coherent suppression… (More)

- Rolf Baier
- 2001

We determine how the yield of large transverse momentum hadrons is modified due to induced gluon radiation off a hard parton traversing a QCD medium. The quenching factor is formally a collinearand infrared-safe quantity and can be treated perturbatively. In spite of that, in the p⊥ region of practical interest, its value turns out to be extremely sensitive… (More)

- Rolf Baier
- 2002

In August 1982 J. D. Bjorken published a preprint [1] on ”Energy Loss of Energetic Partons in Quark-Gluon Plasma: Possible Extinction of High p⊥ Jets in Hadron-Hadron Collisions”, in which he discussed that high energy quarks and gluons propagating through quark-gluon plasma (QGP) suffer differential energy loss, and where he further pointed out that as an… (More)

- Rolf Baier
- 1998

We study analytically the medium-induced energy loss of a high energy parton passing through a finite size QCD plasma, which is expanding longitudinally according to Bjorken’s model. We extend the BDMPS formalism already applied to static media to the case of a quark which hits successive layers of matter of decreasing temperature, and we show that the… (More)

A systematic study of low mass dilepton production from π−ρ interactions in a hot medium is presented. Applying finite temperature perturbation theory the dilepton rate, respectively the virtual photon rate, is computed up to order g ρ. For dilepton masses below the ρ the two-body reactions ππ → ργ, πρ → πγ, and the decay process ρ → ππγ give significant… (More)

In the framework of closed time path thermal field theory we investigate the production rate of hard thermal photons from a QCD plasma away from equilibrium. Dynamical screening provides a finite rate for chemically non-equilibrated distributions of quarks and gluons just as it does in the equilibrium situation. Pinch singularities are shown to be absent in… (More)

The calculation of the radiative energy loss encountered by a fast charged particle which undergoes multiple scattering is being investigated. A detailed derivation of the Landau-PomeranchukMigdal coherent effect in QED is given, focusing on the specific feature of the Coulomb interaction. As a result the radiation intensity per unit length in the coherent… (More)

- Rolf Baier
- 1994

The nonabelian screening potential is calculated in the temporal axial gauge. The Slavnov-Taylor identity is used to construct the three-gluon vertex function from the inverse gluon propagator. After solving the Schwinger Dyson equation beyond leading order we find that the obtained momentum dependence of the gluon self-energy at high temperature does not… (More)