18 research outputs found
Plasmon Decay: From QED to QCD
Upon using the same theoretical framework, I describe two interesting decay
processes: the electromagnetic plasmon decay into neutrinos, which can be the
dominant cooling mechanism for red giants and white dwarfs, and the gluonic
plasmon decay into quarks, which can be measured in ultra-relativistic
heavy-ion collisions.Comment: 6 pages, 2 PostScript figures included (Talk given at the 3rd
Workshop on Thermal Field Theories and their Applications, Banff, Canada,
August 1993
Thermal Field Theory and Infinite Statistics
We construct a quantum thermal field theory for scalar particles in the case
of infinite statistics. The extension is provided by working out the Fock space
realization of a "quantum algebra", and by identifying the hamiltonian as the
energy operator. We examine the perturbative behavior of this theory and in
particular the possible extension of the KLN theorem, and argue that it appears
as a stable structure in a quantum field theory context.Comment: 25 pp, INLN 92/16, ENSLAPP-A-372/9
Thermal quark production in pure glue and quark gluon plasmas
We calculate production rates for massless and massive
quarks in pure glue and quark gluon plasmas to leading order in the strong
coupling constant . The leading contribution comes from gluon decay into
pairs, using a thermal gluon propagator with finite thermal mass and
damping rate. The rate behaves as when and depends linearly on the transverse gluon damping
rate for all values of the quark mass . The light quark (, , )
chemical equilibration time is approximately 10-100 for 2-3, so
that quarks are likely to remain far from chemical equilibrium in
ultrarelativistic nuclear collisions.Comment: 7 pages, 5 figures (available upon request), CERN preprint
CERN-TH-6882/9
Pre-equilibrium dileptons look thermal
The dilepton mass distribution from pre-equilibrium matter in
ultrarelativistic nuclear collisions is indistinguishable from a thermally
produced distribution.Comment: CERN-TH.6813/93, 3 pages (latex) plus 1 figure (uuencoded postscript
file
Thermal quark production in ultra-relativistic nuclear collisions
We calculate thermal production of u, d, s, c and b quarks in
ultra-relativistic heavy ion collisions. The following processes are taken into
account: thermal gluon decay (g to ibar i), gluon fusion (g g to ibar i), and
quark-antiquark annihilation (jbar j to ibar i), where i and j represent quark
species. We use the thermal quark masses, ,
in all the rates. At small mass (), the production is largely
dominated by the thermal gluon decay channel. We obtain numerical and analytic
solutions of one-dimensional hydrodynamic expansion of an initially pure glue
plasma. Our results show that even in a quite optimistic scenario, all quarks
are far from chemical equilibrium throughout the expansion. Thermal production
of light quarks (u, d and s) is nearly independent of species. Heavy quark (c
and b) production is quite independent of the transition temperature and could
serve as a very good probe of the initial temperature. Thermal quark production
measurements could also be used to determine the gluon damping rate, or
equivalently the magnetic mass.Comment: 14 pages (latex) plus 6 figures (uuencoded postscript files);
CERN-TH.7038/9
Etude perturbative en theorie quantique des champs a temperature finie : application a l'emission de paires de leptons par un plasma de quarks et de gluons
SIGLECNRS T Bordereau / INIST-CNRS - Institut de l'Information Scientifique et TechniqueFRFranc