Original title: Studium inkluzivni produkce elektron-pozltronovych paru ve srazkach Ar+KCl pfi 1.756 AGeV
Translated title: Study of inclusive elektron-positron pair production in collisions of Ar+Kcl at 1.756 A GeV
Authors: Křížek, Filip
Document type: Rigorous theses
Year: 2009
Language: cze
Abstract: [cze] [eng]
Ndzev: Studium inkluzivni produkce elektron-pozltronovych paru ve srazkach Ar+KCl pfi 1.756 AGeV Autor: Mgr. Filip Kfizek, Ph.D. Abstrakt: Spektroskopie di-leptonu vznikajicich v rozpadech lehkych vektorovych mezonu př, co a § se zda byt slibnym pn'stupem jak studovat zmeny vlastnosti techto hadronu vjadernem prostfedi. Tato disertacni prace se zabyva analyzou experiment^ v nemz byla zkoumana produkce e e" paru ve srazkach Ar+KCl pfi kineticke energii svazku 1,756 AGeV, Mefeni probehlo na di-elektronovem spektrometru HADES. HADES je jedinecne zafizerri, ktere bylo navrzeno a sestrojeno pro ucely studia tvorby e e" paru v horke a huste jaderne hmote. Po uvodu do problematiky je v kratkosti nacrtnuta stavba spektrometru HADES. Nasledne se zamefime na analyzu experimentu Ar+KCl. Popiseme a budeme diskutovat vyber reakci triggerem, identifikaci leptonu a navazujici analyzu paru. Spektra paru opravena na efektivitu rekonstrukce a identifikace srovname s pfedpovedi programu Pluto, zalozenem na termalnim modelu, a dale pak s vypoctem transportniho kodu HSD. Na zaver porovname vysledky experimentu, v nichz HADES zkoumal produkci di-elektronu v reakcich Ar+KCl a C+C. Oproti pfedpokladanemu vytezku di-elektronu z rozpadu n->y e*e~ jsme v oblasti invariantnich hmotnosti 0,15-0,50 GeV/c2 zjistili znacn}' pfebytek paru... Title: Study of inclusive electron-positron pair production in collisions of Ar + KC1 at 1.756 AGeV Author: Mgr. Filip Kfi'zek, Ph.D. Abstract: Spectroscopy of di-leptons emerging in decays of the light vector mesons př, CD, and ^ is a promising way how to investigate changes of properties of these hadrons in the surrounding nuclear environment. This thesis deals with an analysis of inclusive e"V pair emission from. Ar+KCl collisions at a kinetic beam energy of 1.756 AGeV. The measurement was carried out using the High Acceptance Di-Electron Spectrometer (HADES). HADES is a unique apparatus dedicated to study e+e~ pair production in hot and dense hadronic matter. After an introduction to the field, the HADES spectrometer is briefly described. Then we focus on the analysis of the Ar+KCl run. We describe and discuss event selection performed by the on-line trigger, lepton identification, and the subsequent pair analysis. Efficiency corrected spectra of parrs are compared with predictions of a thermal model based Monte Carlo event generator (Pluto) and, further, with forecasts of a microscopic transport code (HSD). Finally, we compare results from the HADES Ar+KCl and C+C runs. With respect to the expected di-electron yield from i\-> y e e" decay, in the invariant mass region 0.15 - 0.50 GeV/c2, our spectra...

Institution: Charles University Faculties (theses) (web)
Document availability information: Available in the Charles University Digital Repository.
Original record: http://hdl.handle.net/20.500.11956/21195

Permalink: http://www.nusl.cz/ntk/nusl-275799


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Universities and colleges > Public universities > Charles University > Charles University Faculties (theses)
Academic theses (ETDs) > Rigorous theses