QCD Coupling from a Nonperturbative Determination of the Three-Flavor $\Lambda$ Parameter - INSPIRE

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QCD Coupling from a Nonperturbative Determination of the Three-Flavor $\Lambda$ Parameter

ALPHA

Collaboration

•

Mattia Bruno
(
- Brookhaven Natl. Lab.
)

Jun 12, 2017

6 pages

Published in:

Phys.Rev.Lett. 119 (2017) 10, 102001

Published: Sep 8, 2017

e-Print:

1706.03821 [hep-lat]

DOI:

10.1103/PhysRevLett.119.102001

Report number:

CERN-TH-2017-129,
DESY-17-088,
WUB-17-03

Experiments:

LATTICE-ALPHA

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Abstract: (APS)

We present a lattice determination of the Λ parameter in three-flavor QCD and the strong coupling at the Z pole mass. Computing the nonperturbative running of the coupling in the range from 0.2 to 70 GeV, and using experimental input values for the masses and decay constants of the pion and the kaon, we obtain ΛMS¯(3)=341(12) MeV. The nonperturbative running up to very high energies guarantees that systematic effects associated with perturbation theory are well under control. Using the four-loop prediction for ΛMS¯(5)/ΛMS¯(3) yields αMS¯(5)(mZ)=0.11852(84).

Note:

Correction in the comparison to the LHC value for alpha(1.5TeV) which was given by CMS in the 5-flavor theory. The agreement is improved. Also 1 Reference added and a few typos corrected

quantum chromodynamics
strong coupling
quantum chromodynamics: Lambda parameter
lattice field theory
Z0: pole
mass: pole
nonperturbative
perturbation theory
lattice
numerical calculations

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Figures(7)

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