Effects of long-range forces on the D -term and the energy-momentum structure
Effects of long-range forces on the D -term and the energy-momentum structure
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DOI：
10.1103/physrevd.102.014047
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发表时间：
2020-06
影响因子：
5
通讯作者：
M. Varma;P. Schweitzer
中科院分区：
文献类型：
--
作者：
M. Varma;P. Schweitzer
能量动量张量(EMT)的强子形式因子在最近的文献中引起了相当大的兴趣。这特别涉及到D项形式因数D(T)，以及它在内力方面的吸引人的解释。由于他们的重点是强子结构，到目前为止，理论研究主要集中在具有短程力的强相互作用系统上。电磁相互作用等长程力对EMT的影响尚未得到研究。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性。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了一些在短程系统中被认为是理所当然的概念。我们的结果表明，当存在远程力量时，需要更仔细地定义D项。
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 mainly 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.