<> "The repository administrator has not yet configured an RDF license."^^ . <> . . "Measurement of neutral mesons and direct photons in Pb–Pb collisions at √sNN = 2.76 TeV with the ALICE experiment at the LHC"^^ . "The Quark-Gluon Plasma~(QGP) is a strongly interacting matter with high temperature and energy density, \r\nwhere partons are deconfined. It is hypothesised being the same state the universe was \r\nin just a few microseconds after the Big Bang. Experimentally, the QGP is studied at accelerator experiments \r\nusing heavy-ions. The presence of a deconfined phase after the ultra-relativistic collisions \r\nis expected to influence the system evolution. The search for modifications induced on the \r\nparticle production is carried out taking elementary particle collisions as reference measurement. \\\\\r\nThe research presented in this thesis focuses on the study of neutral meson \r\nand direct photon production in lead ion collisions at $\\sqrt{s_{NN}}$~=~2.76~TeV with the ALICE \r\ndetector at the Large Hadron Collider. The neutral pion and \\e mesons are reconstructed \r\nvia their photon decay channel, exploiting the photon conversions in the detector material. \r\nA modification of the meson spectra is observed and investigated further with the comparison \r\nto similar experimental results as well as theoretical models. \r\nThe measurement of neutral mesons is essential for the study of direct photon production, \r\nsince decay photons are the largest background for this signal. The photon excess signal on top of \r\nthe decay photon background in the transverse momentum interval 1~$<$~\\pT~$<$~1.6~\\GeVc is measured with a \r\nsignificance of 1.5~$\\sigma$. In this region, direct photons are expected to originate from a phase of the QGP \r\nwhere the system is thermalised. In an attempt to describe the phenomenon behind the \r\nobserved signal, comparisons to several theoretical predictions have been performed."^^ . "2017" . . . . . . . "Lucia"^^ . "Leardini"^^ . "Lucia Leardini"^^ . . . . . . "Measurement of neutral mesons and direct photons in Pb–Pb collisions at √sNN = 2.76 TeV with the ALICE experiment at the LHC (PDF)"^^ . . . "Thesis.pdf"^^ . . . "Measurement of neutral mesons and direct photons in Pb–Pb collisions at √sNN = 2.76 TeV with the ALICE experiment at the LHC (Other)"^^ . . . . . . "indexcodes.txt"^^ . . . "Measurement of neutral mesons and direct photons in Pb–Pb collisions at √sNN = 2.76 TeV with the ALICE experiment at the LHC (Other)"^^ . . . . . . "lightbox.jpg"^^ . . . "Measurement of neutral mesons and direct photons in Pb–Pb collisions at √sNN = 2.76 TeV with the ALICE experiment at the LHC (Other)"^^ . . . . . . "preview.jpg"^^ . . . "Measurement of neutral mesons and direct photons in Pb–Pb collisions at √sNN = 2.76 TeV with the ALICE experiment at the LHC (Other)"^^ . . . . . . "medium.jpg"^^ . . . "Measurement of neutral mesons and direct photons in Pb–Pb collisions at √sNN = 2.76 TeV with the ALICE experiment at the LHC (Other)"^^ . . . . . . "small.jpg"^^ . . "HTML Summary of #23756 \n\nMeasurement of neutral mesons and direct photons in Pb–Pb collisions at √sNN = 2.76 TeV with the ALICE experiment at the LHC\n\n" . "text/html" . . . "530 Physik"@de . "530 Physics"@en . .