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Etude de la Diffusion Compton Profondément Virtuelle sur le Nucléon avec le Détecteur CLAS de Jefferson Lab : Mesure des Sections Efficaces polarisées et non polarisées

Abstract : The Generalized Parton Distributions (GPDs), introduced in the 1990's, provide the most complete description of the structure (in quarks and gluons) of the nucleon. The Deeply Virtual Compton Scattering (DVCS), which corresponds to the "hard" exclusive electroproduction of photons on the nucleon, is a key process among the reactions allowing access to the GPDs. A DVCS-dedicated experiment was carried out in 2005 with the CLAS detector of Jefferson Lab, using a polarized electron beam of 5.776 GeV and a hydrogen target. For this experiment, we built and used a dedicated electromagnetic calorimeter capable of detecting the final-state photon. The collected data allowed us to study the DVCS in the widest kinematic range ever accessed for this reaction : 1 < Q² < 4.6 GeV², 0.1 < xB < 0.58, 0.09 < -t < 2 GeV². The work performed during this PhD includes simulation work done for the preparation of the experiment, timing calibration of one of the CLAS subsystems, and data analysis. The aim of the data analysis was the extraction of the unpolarized cross sections of the studied reaction and of the difference of the polarized cross sections, this latter observable being linearly proportional to the GPDs. The obtained results were compared to DVCS theoretical calculations based on one of the most up-to-date GPD parametrizations.
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https://tel.archives-ouvertes.fr/tel-00192414
Contributor : Hyon-Suk Jo <>
Submitted on : Tuesday, November 27, 2007 - 6:06:56 PM
Last modification on : Wednesday, September 16, 2020 - 4:08:30 PM
Long-term archiving on: : Monday, April 12, 2010 - 5:20:38 AM

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Hyon-Suk Jo. Etude de la Diffusion Compton Profondément Virtuelle sur le Nucléon avec le Détecteur CLAS de Jefferson Lab : Mesure des Sections Efficaces polarisées et non polarisées. Physique Nucléaire Théorique [nucl-th]. Université Paris Sud - Paris XI, 2007. Français. ⟨tel-00192414⟩

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