Journal
JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS
Volume 44, Issue 10, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1361-6471/aa888a
Keywords
strong interaction; QCD; nonperturbative; strong coupling
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Funding
- US Department of Energy, Office of Science, Office of Nuclear Physics [DE-AC05-06OR23177]
- Department of Energy [DE-AC02-76SF00515]
- [SLAC-PUB-16449]
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The recent determination of the beta-function of the quantum chromodynamics (QCD) running coupling alpha((MS) over bar)(Q(2)) to five-loops, provides a verification of the convergence of a novel method for determining the fundamental QCD parameter Lambda(s) based on the light-front holographic approach to nonperturbative QCD. The new five-loop analysis, together with improvements in determining the holographic QCD nonperturbative scale parameter k from hadronic spectroscopy, leads to an improved precision of the value of Lambda(s) in the (MS) over bar scheme close to a factor of two; we find Lambda((3))((MS) over bar) = 0.339 +/- 0.019 GeV for n(f) = 3, in excellent agreement with the world average, Lambda((3))((MS) over bar) = 0.332 +/- 0.017 GeV. We also discuss the constraints imposed on the scale dependence of the strong coupling in the nonperturbative domain by superconformal quantum mechanics and its holographic embedding in anti-de Sitter space.
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