We analyze small-x DVCS data using flexible GPD models and compare our outcome with the full Shuvaev transformation. We point out that the full Shuvaev transform is a model that is equivalent to a conformal GPD and a minimalist ``dual'' parameterization. Some mathematical subtleties of conformal representations are recalled. We also comment on a speculation of a factorization breakdown in DVCS.
Leading twist nuclear shadowing, nuclear generalized parton distributions and nuclear DVCS at small x
本文推广了核遮蔽的首扭理论，计算了无自旋核的夸克和胶子广义部分子分布。我们预测非常大的核阴影的核GPD。在纯横向动量转移的限制下，我们的核GPD变成了依赖于碰撞参数的核部分子分布（PDF）。核遮蔽导致了碰撞参量b和光锥分数x之间的非平凡相关。我们预测了Pb-208在高能下的深虚康普顿散射（DVCS）振幅和DVCS截面。计算了Bethe-Heitler（BH）过程的截面，并讨论了从eA \to e γA截面中提取DVCS信号的问题.我们发现，在核形状因子极小值附近的动量转移t处，eA \to e γA微分截面由DVCS控制.我们还发现，核遮蔽导致DVCS束自旋不对称性，A_{LU}，作为t的函数的戏剧性的振荡。A_{LU}改变符号的点的位置与核阴影的大小直接相关。
N -> Delta DVCS, exclusive DIS processes and skewed quark distributions in large N_c limit
我们计算了Bethe-Heitler过程的振幅：γ^* p -> γΔ^+ -光子的电子韧致辐射伴随着Δ $ isobar. We show that this background is suppressed at small momentum transfer squared t to a proton relative to that for γ^* p -> γp and γ^* p\to -> Δ^+ - DVCS processes. From experimental point of view, this means that N -> N and N -> Δskewed quark distributions (SQD's) might be measurable at small momentum transfer. Several implications and applications of the QCD factorization theorem for the processes γ_{L}^* + p -> h_f +h_s are discussed where h_f - the particle produced along photon momentum $ \vec q$的激发，可能是介子也可能是重子.我们还讨论了DVCS和排他性介子产…
Determination of the pion generalized parton distributions at zero skewness
Institute for Research in Fundamental Sciences (IPM)（基础科学研究所）；University of Tehran（德黑兰大学）；Istituto Nazionale di Fisica Nucleare, Gruppo collegato di Cosenza（意大利国家核物理研究所科森扎协作组）；Dogus University（多古斯大学）
