Deeply virtual Compton scattering to the twist-four accuracy: Impact of finite-t and target mass corrections
Deeply virtual Compton scattering to the twist-four accuracy: Impact of finite-t and target mass corrections
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DOI：
10.1103/physrevd.89.074022
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发表时间：
2014-04-08
影响因子：
5
通讯作者：
Pirnay, B. M.
中科院分区：
文献类型：
--
作者：
Braun, V. M.;Manashov, A. N.;Pirnay, B. M.
我们首次对深度虚化康普顿散射中的几个关键观测值进行了类似于t/q(2)和类似于m(2)/q(2)的运动功率修正的完整计算。详细讨论了前导扭转近似的惯例依赖性问题。此外，我们还用双分布、Mellin-Barnes积分和耗散框架给出了高扭转修正的表示式。这项研究消除了QCD对类似于1-5GeV2的中间光子虚化的QCD预测中的一个重要的不确定性来源，这些预测在现有的和计划的实验中是可以获得的。特别是，有限-t校正是重要的，在数据分析中必须加以考虑。
We carry out the first complete calculation of kinematic power corrections similar to t/Q(2) and similar to m(2)/Q(2) to several key observables in deeply virtual Compton scattering. The issue of convention dependence of the leading twist approximation is discussed in detail. In addition, we work out representations for the higher twist corrections in terms of double distributions, Mellin-Barnes integrals and also within a dissipative framework. This study removes an important source of uncertainties in the QCD predictions for intermediate photon virtualities Q2 similar to 1-5 GeV2 that are accessible in the existing and planned experiments. In particular the finite-t corrections are significant and must be taken into account in the data analysis.