Please use this identifier to cite or link to this item:
http://hdl.handle.net/2445/131794
Title: | Determination of αs from the QCD static energy |
Author: | Bazavov, Alexei Garcia i Tormo, Xavier Petreczky, Péter Soto Riera, Joan Vairo, Antonio Brambilla, Nora |
Keywords: | Física de partícules Experiments Particle physics Experiments |
Issue Date: | 20-Dec-2012 |
Publisher: | American Physical Society |
Abstract: | We compare lattice data for the short-distance part of the static energy in 2+1 flavor quantum chromodynamics (QCD) with perturbative calculations, up to next-to-next-to-next-to leading-logarithmic accuracy. We show that perturbation theory describes very well the lattice data at short distances, and exploit this fact to obtain a determination of the product of the lattice scale r_0 with the QCD scale Lambda_{MS}. With the input of the value of r_0, this provides a determination of the strong coupling alpha_s at the typical distance scale of the lattice data. We obtain alpha_s(1.5 GeV)=0.326\pm0.019, which provides a novel determination of alpha_s at low energy and with three-loop accuracy (including resummation of the leading ultrasoft logarithms). When this value is evolved to the Z-mass scale M_Z, it corresponds to alpha_s(M_Z)=0.1156^{+0.0021}_{-0.0022}. |
Note: | Reproducció del document publicat a: https://doi.org/10.1103/PhysRevD.86.114031 |
It is part of: | Physical Review D, 2012, vol. 86, num. 11, p. 114031 |
URI: | http://hdl.handle.net/2445/131794 |
Related resource: | https://doi.org/10.1103/PhysRevD.86.114031 |
ISSN: | 1550-7998 |
Appears in Collections: | Articles publicats en revistes (Física Quàntica i Astrofísica) |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
623778.pdf | 156.04 kB | Adobe PDF | View/Open |
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.