发表机构
Southeastern Universities Research Association; Jefferson Lab（东南大学研究协会; 杰斐逊实验室）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本文研究静态力场中应力对D项符号的影响，发现自旋偶场贡献为负、自旋奇场贡献为正，并指出D项符号与稳定性无关，推测色通量禁闭可能解释强子负D项。
AI 中文摘要
对于多种强子，包括质子和π介子，D项的符号为负。尽管存在反例，包括氢原子的正D项，但关于这是力学稳定性条件结果的猜测一直存在。在这项工作中，我探讨了D项的符号如何受静态阿贝尔力场所承载的应力影响，发现自旋偶场的贡献为负，而自旋奇场（如电磁场）的贡献为正。这些贡献与各自场量子D项的符号相关。由于不同自旋的场可以产生相同的势——从而产生具有相同波函数的同等稳定的复合系统——D项的符号与稳定性无关。由于强子由自旋为一的胶子束缚，它们的负D项显得非典型，需要解释。我简要推测了色通量禁闭如何可能产生负的强子D项。
英文摘要
The sign of the D-term is negative for a variety of hadrons, including the proton and pion. Speculation that this is the result of a mechanical stability condition has persisted despite counterexamples, including the positive D-term of the hydrogen atom. In this work, I explore how the sign of the D-term is influenced by the stress carried by static abelian force fields, finding the contributions from spin-even fields to be negative and the contributions from spin-odd fields (such as the electromagnetic field) to be positive. These contributions correlate with the signs of the D-terms of the fields' respective quanta. Since fields with different spin can produce identical potentials---thus resulting in equally-stable composite systems with identical wave functions---the sign of the D-term has nothing to do with stability. Since hadrons are bound by spin-one gluons, their negative D-terms appear atypical and require explanation. I briefly speculate on how color flux confinement could produce a negative hadronic D-term.
Comments27 pages, 10 figures
