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Virtual compton scattering at low energy; Diffusion compton virtuelle a basse energie

Abstract

The work described in this PhD is a study of the Virtual Compton scattering (VCS) off the proton at low energy, below pion production threshold. Our experiment has been carried out at MAMI in the collaboration with the help of two high resolution spectrometers. Experimentally, the VCS process is the electroproduction of photons off a liquid hydrogen target. First results of data analysis including radiative corrections are presented and compared with low energy theorem prediction. VCS is an extension of the Real Compton Scattering. The virtuality of the incoming photon allows us to access new observables of the nucleon internal structure which are complementarity to the elastic form factors: the generalized polarizabilities (GP). They are function of the squared invariant mass of the virtual photo. The mass limit of these observables restore the usual electric and magnetic polarizabilities. Our experiment is the first measurement of the VCS process at a virtual photon mass equals 0.33 Ge V square. The experimental development presents the analysis method. The high precision needed in the absolute cross-section measurement required an accurate estimate of radiative corrections to the VCS. This new calculation, which has been performed in the dimensional regulation scheme, composes the theoretical part  More>>
Authors:
Publication Date:
Sep 01, 1997
Product Type:
Technical Report
Report Number:
CEA-DAPNIA-SPhN-97-01T
Reference Number:
EDB-00:108626
Resource Relation:
Other Information: 105 refs; PBD: Sep 1997
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; CHERENKOV COUNTERS; CHIRAL SYMMETRY; COMPTON EFFECT; FEYNMAN DIAGRAM; HYDROGEN 1 TARGET; INTEGRAL CROSS SECTIONS; KLEIN-NISHINA FORMULA; LOW-ENERGY THEOREM; MICROTRONS; PARTICLE KINEMATICS; POLARIZABILITY; QUANTUM ELECTRODYNAMICS; RADIATIVE CORRECTIONS; RAYLEIGH SCATTERING
OSTI ID:
20056650
Research Organizations:
CEA Centre d'Etudes de Saclay, 91 - Gif-sur-Yvette (France). Dept. d'Astrophysique, de la Physique des Particules, de la Physique Nucleaire et de l'Instrumentation Associee
Country of Origin:
France
Language:
French
Other Identifying Numbers:
TRN: FR9803406017433
Availability:
Available from INIS in electronic form
Submitting Site:
FRN
Size:
230 pages
Announcement Date:

Citation Formats

Lhuillier, D. Virtual compton scattering at low energy; Diffusion compton virtuelle a basse energie. France: N. p., 1997. Web.
Lhuillier, D. Virtual compton scattering at low energy; Diffusion compton virtuelle a basse energie. France.
Lhuillier, D. 1997. "Virtual compton scattering at low energy; Diffusion compton virtuelle a basse energie." France.
@misc{etde_20056650,
title = {Virtual compton scattering at low energy; Diffusion compton virtuelle a basse energie}
author = {Lhuillier, D}
abstractNote = {The work described in this PhD is a study of the Virtual Compton scattering (VCS) off the proton at low energy, below pion production threshold. Our experiment has been carried out at MAMI in the collaboration with the help of two high resolution spectrometers. Experimentally, the VCS process is the electroproduction of photons off a liquid hydrogen target. First results of data analysis including radiative corrections are presented and compared with low energy theorem prediction. VCS is an extension of the Real Compton Scattering. The virtuality of the incoming photon allows us to access new observables of the nucleon internal structure which are complementarity to the elastic form factors: the generalized polarizabilities (GP). They are function of the squared invariant mass of the virtual photo. The mass limit of these observables restore the usual electric and magnetic polarizabilities. Our experiment is the first measurement of the VCS process at a virtual photon mass equals 0.33 Ge V square. The experimental development presents the analysis method. The high precision needed in the absolute cross-section measurement required an accurate estimate of radiative corrections to the VCS. This new calculation, which has been performed in the dimensional regulation scheme, composes the theoretical part of this thesis. At low q', preliminary results agree with low energy theorem prediction. At higher q', substraction of low energy theorem contribution to extract GP is discussed. (author)}
place = {France}
year = {1997}
month = {Sep}
}