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25 April 2024

» pubmed » pmid17280421

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Scaling tests of the cross section for deeply virtual Compton scattering
C Muñoz Camacho ; A Camsonne ; M Mazouz ; C Ferdi ; G Gavalian ; E Kuchina ; M Amarian ; K A Aniol ; M Beaumel ; H Benaoum ; P Bertin ; M Brossard ; J-P Chen ; E Chudakov ; B Craver ; F Cusanno ; C W de Jager ; A Deur ; R Feuerbach ; J-M Fieschi ; S Frullani ; M Garçon ; F Garibaldi ; O Gayou ; R Gilman ; J Gomez ; P Gueye ; P A M Guichon ; B Guillon ; O Hansen ; D Hayes ; D Higinbotham ; T Holmstrom ; C E Hyde-Wright ; H Ibrahim ; R Igarashi ; X Jiang ; H S Jo ; L J Kaufman ; A Kelleher ; A Kolarkar ; G Kumbartzki ; G Laveissière ; J J Lerose ; R Lindgren ; N Liyanage ; H-J Lu ; D J Margaziotis ; Z-E Meziani ; K McCormick ; R Michaels ; B Michel ; B Moffit ; P Monaghan ; S Nanda ; V Nelyubin ; M Potokar ; Y Qiang ; R D Ransome ; J-S Réal ; B Reitz ; Y Roblin ; J Roche ; F Sabatié ; A Saha ; S Sirca ; K Slifer ; P Solvignon ; R Subedi ; V Sulkosky ; P E Ulmer ; E Voutier ; K Wang ; L B Weinstein ; B Wojtsekhowski ; X Zheng ; L Zhu ; ;
Date:	31 Dec 2006
Journal:	Phys Rev Lett, 97 (26), 262002
Abstract:	We present the first measurements of the e[over -->]p-->epgamma cross section in the deeply virtual Compton scattering (DVCS) regime and the valence quark region. The Q(2) dependence (from 1.5 to 2.3 GeV(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(2). The helicity-independent cross section is also measured at Q(2)=2.3 GeV(2). We present the first model-independent measurement of linear combinations of GPDs and GPD integrals up to the twist-3 approximation.
Source:	PubMed, pmid17280421
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