23 research outputs found
-Radiation of thermalized Quark-Gluon-Plasma
Long time ago, photon production was proposed as a probe and a thermometer
for Quark-Gluon Plasma (QGP). However, only recently has the complete
order photon spectrum been obtained. In this paper we give a brief
review of the problematic as well as discuss the result.Comment: 6 pages, 2 ps figures, Contribution to the Proceedings of "Quark
Matter 2002", Nantes, France, 18-24 Jul 200
Letter of Intent: Search for sub-millicharged particles at J-PARC
We propose a new experiment sensitive to the detection of millicharged
particles produced at the GeV proton fixed-target collisions at J-PARC.
The potential site for the experiment is B2 of the Neutrino Monitor building,
m away from the target. With , the
experiment can provide sensitivity to particles with electric charge
for mass less than and
for mass less than .
This brings a substantial extension to the current constraints on the charge
and the mass of such particles
A simple sum rule for the thermal gluon spectral function and applications
In this paper, we derive a simple sum rule satisfied by the gluon spectral
function at finite temperature. This sum rule is useful in order to calculate
exactly some integrals that appear frequently in the photon or dilepton
production rate by a quark gluon plasma. Using this sum rule, we rederive
simply some known results and obtain some new results that would be extremely
difficult to justify otherwise. In particular, we derive an exact expression
for the collision integral that appears in the calculation of the
Landau-Pomeranchuk-Migdal effect.Comment: 24 latex pages, 2 postscript figure
Enhanced thermal production of hard dileptons by processes
In the framework of the Hard Thermal Loop effective theory, we calculate the
two-loop contributions to hard lepton pair production in a quark-gluon plasma.
We show that the result is free of any infrared and collinear singularity. We
also recover the known fact that perturbation theory leads to integrable
singularities at the location of the threshold for . It
appears that the process calculated here significantly enhances the rate of low
mass hard dileptons.Comment: 32 latex pages, 14 postscript figure