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Mesure de la production des photons isolés dans les collisions p-p à √s=7 Tev avec le détecteur ALICE

Abstract : The high transverse momentum photon production inproton-proton collisions (p-p) is described by perturbativequantum chromodynamics (pQCD). Among thesephotons, those produced directly by an energetic partonicinteraction (called direct photons) are of great interestsince their measurement allows to test pQCDpredictions and it allows also the constraint of protonstructure functions. The work of this thesis aims atstudying and measuring direct photons produced in p-pcollisions at 7 TeV with the ALICE detector. The ALICEelectromagnetic calorimeter (EMCal) is used to achievethis measurement which is based on an isolation procedurethat allows to reduce background coming fromother photon production modes (fragmentation, decay).Multiple aspects like EMCal data quality, photon identificationas well as spectrum correction and its normalizationare highlighted. Finally, the first isolated promptphoton cross-section measured with ALICE detector ispresented, compared to theoretical predictions and tothe last results from other LHC experiments.
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Alexis Mas. Mesure de la production des photons isolés dans les collisions p-p à √s=7 Tev avec le détecteur ALICE. Physique Nucléaire Théorique [nucl-th]. Ecole des Mines de Nantes, 2013. Français. ⟨NNT : 2013EMNA0121⟩. ⟨tel-00952893⟩

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