长程力对D项和能量动量结构的影响
Effects of long-range forces on the D-term and the energy-momentum structure
摘要：
能量-动量张量的强子形状因子在最近的文献中引起了相当大的兴趣。这特别涉及D项形状因子D（t），其在内力方面具有吸引人的解释。由于他们的重点是强子结构，理论研究到目前为止集中在强相互作用系统与短程力。像电磁相互作用这样的长程力对EMT的影响还没有研究过。电磁力在质子内部的力平衡中起着很小的作用，但它们的长程性质引入了短程力系统中不存在的新特征。我们使用一个简单但一致的质子经典场论模型来说明长程力的存在如何改变短程系统中一些理所当然的概念。我们的研究结果意味着，更仔细的定义的D-长期需要长距离的力量。
英文摘要：
The hadronic form factors of the energy-momentum tensor (EMT) have attracted considerable interest in recent literature. This concerns especially the D-term form factor D(t) with its appealing interpretation in terms of internal forces. With their focus on hadron structure, theoretical studies so far have concentrated on strongly interacting systems with short-range forces. Effects on the EMT due to long-range forces like the electromagnetic interaction have not yet been studied. Electromagnetic forces play a small role in the balance of forces inside the proton, but their long-range nature introduces new features which are not present in systems with short-range forces. We use a simple but consistent classical field theoretical model of the proton to show how the presence of long-range forces alters some notions taken for granted in short-range systems. Our results imply that a more careful definition of the D-term is required when long-range forces are present.
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