Virtual deep Compton scattering from Hall A at Jefferson Laboratory; Diffusion Compton profondement virtuelle dans le Hall A au Jefferson Laboratory

Thesis/Dissertation · Wed Dec 14 04:00:00 EST 2005

DOI:https://doi.org/10.2172/1054162· OSTI ID:1054162

Camacho, Carlos Munoz ^[1]

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1. Univ. Pierre et Marie Curie, Paris (France)

Generalized Parton Distributions (GPDs), introduced in the late 90s, provide a universal description of hadrons in terms of the underlying degrees of freedom of Quantum Chromodynamics: quarks and gluons. GPDs appear in a wide variety of hard exclusive reactions and the advent of high luminosity accelerator facilities has made the study of GPDs accessible to experiment. Deeply Virtual Compton Scattering (DVCS) is the golden process involving GPDs. The first dedicated DVCS experiment ran in the Hall A of Jefferson Lab in Fall 2004. An electromagnetic calorimeter and a plastic scintillator detector were constructed for this experiment, together with specific electronics and acquisition system. The experiment preparation, data taking and analysis are described in this document. Results on the absolute cross section difference for opposite beam helicities provide the first measurement of a linear combination of GPDs as a function of the momentum transfer to the nucleon.

• Research Organization: Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
• Sponsoring Organization: USDOE Office of Energy Research (ER)
• DOE Contract Number: AC05-84ER40150
• OSTI ID: 1054162
• Report Number(s): JLAB-PHY--05-402; DOE/ER/40150--4963
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
Deeply Virtual Compton Scattering (DVCS)
Electromagnetic probe
Exclusive reactions
Generalized Parton Distributions (GPDs)
Jefferson Lab (CEBAF)
Nucleon structure