Verlag des Forschungszentrums Jülich
JUEL-2846
Baron, Niels Christian
Photon-Photon und Photon-Hadron Prozesse in relativistischen Schwerionen-Kollisionen
118 S., 1993
Abstract
Photon-photon and photon-hadron interactions 1Il relativistic heavy ion collisions
are studied in the framework of the impact parameter dependent equivalent
photon approximation. Improvements of this method, like forrnfactor inclusion and
geometrical modifications are developed.
In peripheral (non-disruptive)
relativistic heavy ion collisions where the ions pass each other without strong interactions,
the electromagnetic processes can be studied in their pure form. The lepton
pair production is an important diagnostic tool in relativistic heavy ion collisions.
The coherent " lepton pair production is therefore extensively studied in disruptive
but also in non-disruptive collisions. The effects of strong interactions on the
coherent " lepton pair production in disruptive collisions are discussed in terms
of a simple stopping model. Coherent " dielectron production contributes to the
dilepton production in high energy hadron-hadron collisions. As an example, the coherent
dielectron production in 7C-p collisions is studied in terms of the equivalent
photon approximation. Peripheral ultrarelativistic heavy ion collisions open up new
possibilities for " physics. Taking into acount ,A background reactions, typical
" processes in the relevant invariant mass ranges are discussed. The extreme high
energy part of the equivalent photon spectrum leads to hard photon-patton reactions.
As a potential tool to investigate the gluon distribution function of nucleons,
the qlj production via the ,g fusion in ultrarelativistic heavy ion collisions is studied.
It is the purpose of this work to investigate how photon-photon and photon-hadron
reactions in relativistic heavy ion collisions may contribute to the understanding of
QeD and the standard model.
Neuerscheinungen
Schriften des Forschungszentrums Jülich
Ihre Ansprechperson
Heike Lexis
+49 2461 61-5367
zb-publikation@fz-juelich.de