448 research outputs found
Photon production by a quark gluon plasma
In this talk, I review the status of the calculation of the photon production
rate in a hot quark-gluon plasma. Particular emphasis is given to the
discussion of the various length scales of the problem.Comment: Based on talks given at Quark Matter 2001, January 2001, Stony Brook,
USA and at 36th Rencontres de Moriond, March 2001, Les Arcs, France (4 pages
LaTeX document, 3 postscript figures
The glasma initial state and JIMWLK factorization
We review recent work on understanding the next to leading order corrections
to the classical fields that dominate the initial stages of a heavy ion
collision. We have recently shown that the leading ln(1/x) divergences of these
corrections to gluon multiplicities can be factorized into the JIMWLK evolution
of the color charge density distributions.Comment: 4 pages, 2 figures. Talk given by T.L. at Strong and Electroweak
Matter 2008 (SEWM08), August 26-29, 2008, Amsterdam, The Netherland
Factorization in high energy nucleus-nucleus collisions
In this talk, we discuss the factorization of the logarithms of energy in the
Color Glass Condensate framework.Comment: proceedings of the conference ISMD 2012, Kielce, Polan
Are there monojets in high-energy proton-nucleus collisions?
We study high-energy proton-nucleus collisions within the Colour Glass
Condensate framework, and compute the probabilities of having a definite number
of scatterings in the nucleus with a momentum transfer larger than a given cut.
Various properties of the distribution in the number of multiple scatterings
are investigated, and we conclude that events with monojets are very unlikely,
except for extreme values of the saturation scale Qs.Comment: 4 pages, 4 eps-figures. Talk given at Quark Matter 2006, Shanghai,
14-20 Nov. 200
Quark-antiquark production from classical fields and chemical equilibration
We compute by numerical integration of the Dirac equation the number of
quark-antiquark pairs produced in the classical color fields of colliding
ultrarelativistic nuclei. The backreaction of the created pairs on the color
fields is not taken into account. While the number of qqbar pairs is
parametrically suppressed in the coupling constant, we find that in this
classical field model it could even be compatible with the thermal ratio to the
number of gluons. After isotropization one could thus have quark-gluon plasma
in chemical equilibrium.Comment: 4 pages, 6 figures, contribution to proceedings of Quark Matter 2005,
Budapest, Aug 4-
Quark production in heavy ion collisions I. Formalism and boost invariant fermionic light-cone mode functions
We revisit the problem of quark production in high energy heavy ion
collisions, at leading order in in the color glass condensate
framework. In this first paper, we setup the formalism and express the quark
spectrum in terms of a set of mode functions of the Dirac equation. We
determine analytically their initial value in the Fock-Schwinger gauge on a
proper time surface , in a basis which makes manifest the boost
invariance properties of this problem. We also describe a statistical algorithm
to perform the sampling of the mode functions.Comment: 40 pages, 3 figures, alternate derivation in the new appendix
Production of quark pairs from classical gluon fields
We compute by numerical integration of the Dirac equation the number of
quark-antiquark pairs produced in the classical color fields of colliding
ultrarelativistic nuclei. Results for the dependence of the number of quarks on
the strength of the background field, the quark mass and time are presented. We
also perform several tests of our numerical method. While the number of qqbar
pairs is parametrically suppressed in the coupling constant, we find that in
this classical field model it could even be compatible with the thermal ratio
to the number of gluons.Comment: 8 pages, 12 figures, contribution to the proceedings of the Quark
Gluon Plasma Thermalization Workshop, Vienna, August 200
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