Energy-momentum tensor in QCD: nucleon mass decomposition and mechanical equilibrium
Energy-momentum tensor in QCD: nucleon mass decomposition and mechanical equilibrium
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DOI：
10.1007/jhep11(2021)121
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发表时间：
2021-09
影响因子：
5.4
通讯作者：
C'edric Lorc'e;A. Metz;B. Pasquini;S. Rodini
中科院分区：
文献类型：
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作者：
C'edric Lorc'e;A. Metz;B. Pasquini;S. Rodini
我们详细回顾和研究了有关核子质量分解问题的最新进展。我们特别讨论了量子场论中的维里定理及其对核子质量分解和力学平衡的意义。我们重新考虑了极小减法格式中QCD能量动量张量的重整化及其分量的物理解释，以及道反常和Poincaré对称性所起的作用。我们还研究了一些工作中提出的“量子反常能”的概念，作为对核子质量的一种新贡献。考察各种论证，我们得出结论，由于平移对称性，量子反常能量并不是对质量和规则的真正贡献。
We review and examine in detail recent developments regarding the question of the nucleon mass decomposition. We discuss in particular the virial theorem in quantum field theory and its implications for the nucleon mass decomposition and mechanical equilibrium. We reconsider the renormalization of the QCD energy-momentum tensor in minimal-subtraction-type schemes and the physical interpretation of its components, as well as the role played by the trace anomaly and Poincaré symmetry. We also study the concept of “quantum anomalous energy” proposed in some works as a new contribution to the nucleon mass. Examining the various arguments, we conclude that the quantum anomalous energy is not a genuine contribution to the mass sum rule, as a consequence of translation symmetry.