Issue |
EPJ Web Conf.
Volume 282, 2023
8th International Symposium on Symmetries in Subatomic Physics (SSP 2022)
|
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Article Number | 01006 | |
Number of page(s) | 10 | |
DOI | https://doi.org/10.1051/epjconf/202328201006 | |
Published online | 03 April 2023 |
https://doi.org/10.1051/epjconf/202328201006
Origin of the Proton Mass
1 School of Physics, Nanjing University, Nanjing, Jiangsu 210093, China
2 Institute for Nonperturbative Physics, Nanjing University, Nanjing, Jiangsu 210093, China
* e-mail: cdroberts@nju.edu.cn
Published online: 3 April 2023
Atomic nuclei lie at the core of everything visible; and at the first level of approximation, their atomic weights are simply the sum of the masses of all the neutrons and protons (nucleons) they contain. Each nucleon has a mass mN ≈ 1 GeV ≈ 2000-times the electron mass. The Higgs boson – discovered at the large hadron collider in 2012, a decade ago – produces the latter, but what generates the nucleon mass? This is a pivotal question. The answer is widely supposed to lie within quantum chromodynamics (QCD), the strong-interaction piece of the Standard Model. Yet, it is far from obvious. In fact, removing Higgs-boson couplings into QCD, one arrives at a scale invariant theory, which, classically, can’t support any masses at all. This contribution sketches forty years of developments in QCD, which suggest a solution to the puzzle, and highlight some of the experiments that can validate the picture.
© The Authors, published by EDP Sciences, 2023
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