Camacho C Muñoz, Camsonne A, Mazouz M, Ferdi C, Gavalian G, Kuchina E, Amarian M, Aniol K A, Beaumel M, Benaoum H, Bertin P, Brossard M, Chen J-P, Chudakov E, Craver B, Cusanno F, de Jager C W, Deur A, Feuerbach R, Fieschi J-M, Frullani S, Garçon M, Garibaldi F, Gayou O, Gilman R, Gomez J, Gueye P, Guichon P A M, Guillon B, Hansen O, Hayes D, Higinbotham D, Holmstrom T, Hyde-Wright C E, Ibrahim H, Igarashi R, Jiang X, Jo H S, Kaufman L J, Kelleher A, Kolarkar A, Kumbartzki G, Laveissière G, Lerose J J, Lindgren R, Liyanage N, Lu H-J, Margaziotis D J, Meziani Z-E, McCormick K, Michaels R, Michel B, Moffit B, Monaghan P, Nanda S, Nelyubin V, Potokar M, Qiang Y, Ransome R D, Réal J-S, Reitz B, Roblin Y, Roche J, Sabatié F, Saha A, Sirca S, Slifer K, Solvignon P, Subedi R, Sulkosky V, Ulmer P E, Voutier E, Wang K, Weinstein L B, Wojtsekhowski B, Zheng X, Zhu L
CEA Saclay, DAPNIA/SPhN, F-91191 Gif-sur-Yvette, France.
Phys Rev Lett. 2006 Dec 31;97(26):262002. doi: 10.1103/PhysRevLett.97.262002. Epub 2006 Dec 29.
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.
我们给出了在深度虚拟康普顿散射（DVCS）区域和价夸克区域中e[上箭头→]p→epγ截面的首次测量结果。螺旋度相关截面的Q(2)依赖性（从1.5到2.3 GeV(2)）表明了DVCS的扭转-2主导地位，证明了广义部分子分布（GPDs）在中等Q(2)下可通过实验获取。在Q(2)=2.3 GeV(2)时也测量了与螺旋度无关的截面。我们给出了在扭转-3近似下GPDs线性组合和GPD积分的首次与模型无关的测量结果。
