期刊
PHYSICAL REVIEW D
卷 105, 期 7, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.105.074026
关键词
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资金
- National Science Centre (Poland) [2018/31/D/ST2/00666, 2020/38/E/ST2/00122]
- COST Action [CA 15213, MSCA RISE 823947]
- European Union [824093]
We revisit the calculation of quark and scalar propagators in a gluon background field and provide the first power correction method. The main results include deriving a next-to-eikonal expansion of the quark propagator, isolating spinor-specific next-to-eikonal corrections from universal ones, and presenting a new method to calculate next-to-eikonal corrections from the x-dependence of the background field.
We revisit the calculation of quark and scalar propagators in a gluon background field at next-to-eikonal accuracy, which will provide the first power correction to scattering processes in the high-energy limit, including gluon saturation effects. The two main results of our study are as follows. First, we derive a very general next-to-eikonal expansion of the quark propagator in terms of the scalar propagator, which allows us to isolate spinor-specific next-to-eikonal corrections from the universal ones. Second, we present a new method allowing, for the first time, a systematic calculation of the next-to-eikonal corrections coming from the x- dependence of the background field. This opens the possibility to study high-energy scattering processes on a target with nontrivial dynamics instead of on a static one, by going beyond infinite Lorentz time dilation of the target.
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