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@PHDTHESIS{Harabasz:209913,
author = {Harabasz, Szymon and Salabura, Piotr},
othercontributors = {Galatyuk, Tetyana},
title = {{R}econstruction of virtual photons from {A}u+{A}u
collisions at 1.23 {G}e{V}/u},
school = {TU Darmstadt},
type = {Dissertation},
address = {Darmstadt},
publisher = {TU Darmstadt},
reportid = {GSI-2018-00642},
pages = {174 p.},
year = {2016},
note = {1. Supervisor: Prof. Dr. phil. nat. Tetyana Galatyuk 2.
Supervisor: Prof. dr hab. Piotr Salabura 1. Referee:
Priv.-Doz. Dr. Anton Andronic 2. Referee: Prof. Dr. Bengt
Friman; Dissertation, TU Darmstadt, 2017},
abstract = {This thesis presents data analysis of dilepton excess
radiation in Au+Au at beam kinetic energy 1.23A GeV
experiment performed by HADES. It starts with an overview of
QCD symmetries and its thermodynamics properties. It is
followed by a discussion of details of experimental setup
that are necessary to understand the data analysis. The data
analysis itself is described in the main part of the
manuscript. This starts with tools and techniques that have
been used. An excellent performance of lepton identification
with a neural network, in terms of lepton sample purity, has
been proven. It is not possible to divide all e+ and e− in
a single event into correlated pairs and combinatorial
background must be estimated on a statistical way.
Reconstructed signal should be corrected for efficiency in
order to be compared with other measurements and theory
predictions. This is done by multiplying the signal after
background subtraction by a factor depending on the same
pair kinematic variable as the signal spectrum. After all
the analysis steps spectra are examined in order to make
physical statements. Average temperature of the medium
emitting dileptons was directly extracted from the fit to
the invariant mass. Comparison to model calculations showed
their consistency with the data in various},
cin = {HAD / HADES@GSI},
cid = {I:(DE-Ds200)HAD-20080822OR103 / I:(DE-Ds200)Coll-GSI-HADES},
pnm = {612 - Cosmic Matter in the Laboratory (POF3-612) /
HGF-IVF-VH-NG-823 - VH-NG-823 : HADES/CBM, VIP-QM -
exploring Quark Matter with VIrtual Photons
(HGF-IVF-VH-NG-823) / HGS-HIRe - HGS-HIRe for FAIR
(HGS-HIRe)},
pid = {G:(DE-HGF)POF3-612 / G:(DE-Ds200)HGF-IVF-VH-NG-823 /
G:(DE-Ds200)HGS-HIRe},
typ = {PUB:(DE-HGF)11},
urn = {urn:nbn:de:tuda-tuprints-66054},
url = {https://repository.gsi.de/record/209913},
}