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Title: Scaling Tests of the Cross Section for Deeply Virtual Compton Scattering

Abstract

We present the first measurements of the e(vector sign)p{yields}ep{gamma} cross section in the deeply virtual Compton scattering (DVCS) regime and the valence quark region. The Q{sup 2} dependence (from 1.5 to 2.3 GeV{sup 2}) of the helicity-dependent cross section indicates the twist-2 dominance of DVCS, proving that generalized parton distributions (GPDs) are accessible to experiment at moderate Q{sup 2}. The helicity-independent cross section is also measured at Q{sup 2}=2.3 GeV{sup 2}. We present the first model-independent measurement of linear combinations of GPDs and GPD integrals up to the twist-3 approximation.

Authors:
; ; ; ;  [1]; ; ; ; ; ;  [2]; ; ; ;  [3]; ; ; ; ;  [4]
  1. CEA Saclay, DAPNIA/SPhN, F-91191 Gif-sur-Yvette (France)
  2. Universite Blaise Pascal/CNRS-IN2P3, F-63177 Aubiere (France)
  3. Laboratoire de Physique Subatomique et de Cosmologie, 38026 Grenoble (France)
  4. Old Dominion University, Norfolk, Virginia 23508 (United States) (and others)
Publication Date:
OSTI Identifier:
20861542
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review Letters; Journal Volume: 97; Journal Issue: 26; Other Information: DOI: 10.1103/PhysRevLett.97.262002; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; APPROXIMATIONS; COMPTON EFFECT; CROSS SECTIONS; DISTRIBUTION; HELICITY; QUARKS

Citation Formats

Camacho, C. Munoz, Beaumel, M., Garcon, M., Guichon, P. A. M., Sabatie, F., Camsonne, A., Ferdi, C., Brossard, M., Fieschi, J.-M., Laveissiere, G., Michel, B., Mazouz, M., Guillon, B., Real, J.-S., Voutier, E., Gavalian, G., Amarian, M., Hayes, D., Hyde-Wright, C. E., and Ibrahim, H.. Scaling Tests of the Cross Section for Deeply Virtual Compton Scattering. United States: N. p., 2006. Web. doi:10.1103/PHYSREVLETT.97.262002.
Camacho, C. Munoz, Beaumel, M., Garcon, M., Guichon, P. A. M., Sabatie, F., Camsonne, A., Ferdi, C., Brossard, M., Fieschi, J.-M., Laveissiere, G., Michel, B., Mazouz, M., Guillon, B., Real, J.-S., Voutier, E., Gavalian, G., Amarian, M., Hayes, D., Hyde-Wright, C. E., & Ibrahim, H.. Scaling Tests of the Cross Section for Deeply Virtual Compton Scattering. United States. doi:10.1103/PHYSREVLETT.97.262002.
Camacho, C. Munoz, Beaumel, M., Garcon, M., Guichon, P. A. M., Sabatie, F., Camsonne, A., Ferdi, C., Brossard, M., Fieschi, J.-M., Laveissiere, G., Michel, B., Mazouz, M., Guillon, B., Real, J.-S., Voutier, E., Gavalian, G., Amarian, M., Hayes, D., Hyde-Wright, C. E., and Ibrahim, H.. Sun . "Scaling Tests of the Cross Section for Deeply Virtual Compton Scattering". United States. doi:10.1103/PHYSREVLETT.97.262002.
@article{osti_20861542,
title = {Scaling Tests of the Cross Section for Deeply Virtual Compton Scattering},
author = {Camacho, C. Munoz and Beaumel, M. and Garcon, M. and Guichon, P. A. M. and Sabatie, F. and Camsonne, A. and Ferdi, C. and Brossard, M. and Fieschi, J.-M. and Laveissiere, G. and Michel, B. and Mazouz, M. and Guillon, B. and Real, J.-S. and Voutier, E. and Gavalian, G. and Amarian, M. and Hayes, D. and Hyde-Wright, C. E. and Ibrahim, H.},
abstractNote = {We present the first measurements of the e(vector sign)p{yields}ep{gamma} cross section in the deeply virtual Compton scattering (DVCS) regime and the valence quark region. The Q{sup 2} dependence (from 1.5 to 2.3 GeV{sup 2}) of the helicity-dependent cross section indicates the twist-2 dominance of DVCS, proving that generalized parton distributions (GPDs) are accessible to experiment at moderate Q{sup 2}. The helicity-independent cross section is also measured at Q{sup 2}=2.3 GeV{sup 2}. We present the first model-independent measurement of linear combinations of GPDs and GPD integrals up to the twist-3 approximation.},
doi = {10.1103/PHYSREVLETT.97.262002},
journal = {Physical Review Letters},
number = 26,
volume = 97,
place = {United States},
year = {Sun Dec 31 00:00:00 EST 2006},
month = {Sun Dec 31 00:00:00 EST 2006}
}