Mass sum rule of hadrons in the QCD instanton vacuum

Article Physics, Multidisciplinary

Proton mass decomposition: Naturalness and interpretations

Xiangdong Ji

Summary: The article discusses the scope and naturalness of the proton mass decomposition, addressing criticisms and emphasizing the importance of measuring quantum anomalous energy through experiments. It also points out a significant discrepancy in the scalar radius of the nucleon extracted from different methods.

FRONTIERS OF PHYSICS (2021)

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Article Physics, Multidisciplinary

Quantum anomalous energy effects on the nucleon mass

Xiangdong Ji et al.

Summary: The passage discusses a novel energy of pure quantum origin in the nucleon mass, resulting from anomalous breaking of scale symmetry. This energy, known as quantum anomalous energy (QAE), can be explained through a mechanism resembling the Higgs mechanism, involving couplings between nucleon and scalar resonances. Additionally, the QAE sets the scale for other energies in the nucleon through a relativistic virial theorem and provides a negative pressure to confine colored quarks.

SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY (2021)

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Article Astronomy & Astrophysics

Nucleon axial and pseudoscalar form factors from lattice QCD at the physical point

C. Alexandrou et al.

Summary: The nucleon axial and induced pseudoscalar form factors are computed using three ensembles of gauge configurations, one of which includes strange and charm quarks. The latter ensemble with finer lattice spacing and larger statistics is used for final results, while the other two are used to assess volume effects. The momentum dependence of these form factors and their relations based on pion pole dominance and the partially conserved axial-vector current hypothesis are examined.

PHYSICAL REVIEW D (2021)

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Article Astronomy & Astrophysics