A per-cent-level determination of the nucleon axial coupling from quantum chromodynamics

Autor: Christopher Monahan, Evan Berkowitz, Thorsten Kurth, David Brantley, Chia Cheng Chang, Michael A. Clark, Henry Monge-Camacho, Amy Nicholson, Andre Walker-Loud, Enrico Rinaldi, Balint Joo, Pavlos Vranas, Kostas Orginos, Chris Bouchard, Nicolas Garron
Jazyk: angličtina
Rok vydání: 2018
Předmět:
Zdroj: Chang, CC; Nicholson, AN; Rinaldi, E; Berkowitz, E; Garron, N; Brantley, DA; et al.(2018). A per-cent-level determination of the nucleon axial coupling from quantum chromodynamics. Nature, 558(7708), 91-94. doi: 10.1038/s41586-018-0161-8. Lawrence Berkeley National Laboratory: Retrieved from: http://www.escholarship.org/uc/item/1x31v769
Nature / Physical science 558(7708), 91-94 (2018). doi:10.1038/s41586-018-0161-8
Nature, vol 558, iss 7708
NATURE
ISSN: 0028-0836
DOI: 10.1038/s41586-018-0161-8.
Popis: The $\textit{axial coupling of the nucleon}$, $g_A$, is the strength of its coupling to the $\textit{weak}$ axial current of the Standard Model of particle physics, in much the same way as the electric charge is the strength of the coupling to the electromagnetic current. This axial coupling dictates the rate at which neutrons decay to protons, the strength of the attractive long-range force between nucleons and other features of nuclear physics. Precision tests of the Standard Model in nuclear environments require a quantitative understanding of nuclear physics rooted in Quantum Chromodynamics, a pillar of the Standard Model. The prominence of $g_A$ makes it a benchmark quantity to determine theoretically - a difficult task because quantum chromodynamics is non-perturbative, precluding known analytical methods. Lattice Quantum Chromodynamics provides a rigorous, non-perturbative definition of quantum chromodynamics that can be implemented numerically. It has been estimated that a precision of two percent would be possible by 2020 if two challenges are overcome: contamination of $g_A$ from excited states must be controlled in the calculations and statistical precision must be improved markedly. Here we report a calculation of $g_A^{QCD} = 1.271\pm0.013$, using an unconventional method inspired by the Feynman-Hellmann theorem that overcomes these challenges.
Published in Nature. 46 pages total: Main text 4 pages, Extended Data 8 pages, Supplemental 34 pages. Supporting data and code at https://github.com/callat-qcd/project_gA or https://zenodo.org/record/1241374
Databáze: OpenAIRE
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