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Title: QCD running couplings and effective charges

Journal Article · · Progress in Particle and Nuclear Physics
ORCiD logo [1]; ORCiD logo [2];  [3]
  1. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
  2. SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
  3. Nanjing Univ. (China)

Here we discuss our present knowledge of $$\alpha_s$$, the fundamental running coupling or effective charge of Quantum Chromodynamics (QCD). A precise understanding of the running of $$\alpha_s(Q^2) $$ at high momentum transfer, $$Q$$, is necessary for any perturbative QCD calculation. Equally important, the behavior of $$\alpha_s$$} at low $Q^2$ in the nonperturbative QCD domain is critical for understanding strong interaction phenomena, including the emergence of mass and quark confinement. The behavior of $$\alpha_s(Q^2)$$ at all momentum transfers also provides a connection between perturbative and nonperturbative QCD phenomena, such as hadron spectroscopy and dynamics. We first sketch the origin of the QCD coupling, the reason why its magnitude depends on the scale at which hadronic phenomena are probed, and the resulting consequences for QCD phenomenology. We then summarize latest measurements in both the perturbative and nonperturbative domains. New theory developments include the derivation of the universal nonperturbative behavior of $$\alpha_s(Q^2)$$ from both the Dyson-Schwinger equations and light-front holography. We also describe theory advances for the calculation of gluon and quark Schwinger functions in the nonperturbative domain and the relation of these quantities to $$\alpha_s$$. We conclude by highlighting how the nonperturbative knowledge of $$\alpha_s$$ is now providing a parameter-free determination of hadron spectroscopy and structure, a central and long-sought goal of QCD studies.

Research Organization:
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Nuclear Physics (NP); National Natural Science Foundation of China (NSFC)
Grant/Contract Number:
AC05-06OR23177; AC02-76SF00515
OSTI ID:
2281722
Alternate ID(s):
OSTI ID: 2224135
Report Number(s):
JLAB-PHY--23-3791; DOE/OR/23177-6092; 12135007
Journal Information:
Progress in Particle and Nuclear Physics, Journal Name: Progress in Particle and Nuclear Physics Vol. 134; ISSN 0146-6410
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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Lattice determinations of the strong coupling journal July 2021
The running coupling from SU (3) lattice gauge theory journal November 1992
Determination of αs from hadronic event shapes measured on the Z0 resonance journal June 1992
The Schrödinger functional — a renormalizable probe for non-abelian gauge theories journal October 1992
Determination of the strong coupling constant $$\alpha _\mathrm {s}$$ α s from transverse energy–energy correlations in multijet events at $$\sqrt{s} = 8~\hbox {TeV}$$ s = 8 TeV using the ATLAS detector journal December 2017
Five-loop renormalisation of QCD in covariant gauges journal October 2017
Determination of 55-155-155-1in second order QCD from hadronicZ decays journal March 1992
QCD sum rule calculation of twist-3 contributions to polarized nucleon structure functions journal January 1995
New analyses of event shape observables in electron-positron annihilation and the determination of αs running behavior in perturbative domain journal September 2022
Generalized Gerasimov-Drell-Hearn sum rule for the proton-neutron difference in chiral perturbation theory journal April 2001
The theory of quark confinement journal August 1999
Vortex structures in pureSU(3)lattice gauge theory journal January 2004
Measurement of energy-energy correlations in e + e − →hadrons at √s =29 GeV journal June 1985
Locating the Gribov horizon journal February 2018
Determination of the strong coupling constant $${\varvec{{\alpha _\mathrm{s} (m_\mathrm{Z})}}}$$ α s ( m Z ) in next-to-next-to-leading order QCD using H1 jet cross section measurements: H1 Collaboration journal November 2017
Reconciling the contour-improved and fixed-order approaches for τ hadronic spectral moments. Part II. Renormalon norm and application in αs determinations journal September 2022
Asymptotic freedom in parton language journal August 1977
An investigation of the $$\alpha _S$$ and heavy quark mass dependence in the MSHT20 global PDF analysis journal August 2021
Determination of αs from static QCD potential: OPE with renormalon subtraction and lattice QCD journal April 2019
Bridging a gap between continuum-QCD and ab initio predictions of hadron observables journal March 2015
Renormalization flow of bound states journal February 2002
New CTEQ global analysis of quantum chromodynamics with high-precision data from the LHC journal January 2021
Strings, monopoles, and gauge fields journal December 1974
Renormalization Group and Critical Phenomena. II. Phase-Space Cell Analysis of Critical Behavior journal November 1971
The heavy quark potential and the ϒ, J/ψ systems journal March 1979
Calculation of the nonperturbative strong coupling from first principles journal October 2019
On the Green's functions of quantized fields. I journal July 1951
QCD β -function on the string worldsheet journal December 2018
Indirect determination of the Kugo-Ojima function from lattice data journal November 2009
Scaling, Duality, and the Behavior of Resonances in Inelastic Electron-Proton Scattering journal October 1970
Strong coupling from an improved τ vector isovector spectral function journal February 2021
Review of Particle Physics journal August 2022
Quadratic mass corrections of order to the decay rate of Z- and W-bosons journal July 1997
Dyson-Schwinger equations and their application to hadronic physics journal January 1994
Gauge Invariance and Mass journal January 1962
Spin Sum Rules and the Strong Coupling Constant at large distance conference January 2009
Dual-symmetric theory of hadrons.—I journal October 1970
Indirect lattice evidence for the refined Gribov-Zwanziger formalism and the gluon condensate ⟨ A 2 ⟩ in the Landau gauge journal April 2010
Harmonic-Oscillator Analogy for the Veneziano Model journal September 1969
Ellis-Jaffe sum rule: The estimates of the next-to-next-to-leading-order QCD corrections journal November 1994
Nonperturbative Determination of α ( q 2 ) and Its Experimental Implications journal June 1979
Hadronic Regge trajectories: Problems and approaches journal February 2001
QCD phase structure at finite temperature and density journal March 2020
Renormalization group improved perturbative QCD journal September 1980
On the difference between FOPT and CIPT for hadronic tau decays journal September 2021
Muon g − 2 and α ( M Z 2 ) : A new data-based analysis journal June 2018
Schwinger mechanism for gluons from lattice QCD journal June 2023
On the renormalizability and unitarity of the Curci-Ferrari model for massive vector bosons journal January 1996
Universality of Generalized Parton Distributions in Light-Front Holographic QCD journal May 2018
The role of different schemes in the QCD analysis and determination of the strong coupling journal August 2017
γ * γ → η , η ′ transition form factors journal January 2019
Superconformal baryon-meson symmetry and light-front holographic QCD journal April 2015
Aspects of the functional renormalisation group journal December 2007
New clustering algorithm for multijet cross sections in e+e− annihilation journal October 1991
Energy–energy correlation in electron–positron annihilation at NNLL + NNLO accuracy journal November 2017
On the Green's functions of quantized fields. II journal July 1951
Dispersive approach to power-behaved contributions in QCD hard processes journal June 1996
Analytic structure of the lattice Landau gauge gluon and ghost propagators journal December 2020
Quark confinement and vortices in massive gauge-invariant QCD journal October 1979
Lattice calculation of 1/ p 2 corrections to α s and of Λ (QCD) in the MOM -tilde scheme journal March 2000
Determination of perturbative QCD coupling from ALEPH $$\tau $$ decay data using pinched Borel–Laplace and Finite Energy Sum Rules journal October 2021
Divergence of Perturbation Theory in Quantum Electrodynamics journal February 1952
Vanishing of zero-momentum lattice gluon propagator and color confinement journal October 1991
Critical Phenomena: field theoretical approach journal January 2010
Commensurate scale relations in quantum chromodynamics journal April 1995
Measurements of the Q2-dependence of the proton and deuteron spin structure functions g1p and g1d journal December 1995
Static Quark-Antiquark Potential in QCD to Three Loops journal January 1997
QCD effective charge from the three-gluon vertex of the background-field method journal June 2013
Constraints on parton distribution functions and extraction of the strong coupling constant from the inclusive jet cross section in pp collisions at $$\sqrt{s} = 7$$ s = 7 $$\,\text {TeV}$$ TeV journal June 2015
Static QCD potential in coordinate space with quark masses through two loops journal September 2000
Running coupling and the Λ parameter from SU(3) lattice simulations journal January 1993
Gluon propagator in Feynman gauge by the method of stationary variance journal November 2014
Broken Scale Invariance in Scalar Field Theory journal October 1970
Discretization effects on renormalized gauge-field Green’s functions, scale setting, and the gluon mass journal December 2018
Space-Time Approach to Non-Relativistic Quantum Mechanics journal April 1948
QCD sum rule calculation of twist-4 corrections to Bjorken and Ellis-Jaffe sum rules journal June 1995
B -Meson Gateways to Missing Charmonium Levels journal September 2002
NLO PDFs from the ABMP16 fit journal June 2018
Quantum chromodynamics journal February 1978
First results on the running coupling in QCD with two massless flavours journal August 2001
Maximum wavelength of confined quarks and gluons and properties of quantum chromodynamics journal August 2008
Valence Quark Ratio in the Proton journal April 2022
Short-distance charmonium correlator on the lattice with Möbius domain-wall fermion and a determination of charm quark mass journal September 2016
Dynamical chiral symmetry breaking, Goldstone’s theorem, and the consistency of the Schwinger-Dyson and Bethe-Salpeter equations journal October 1995
More on the nonperturbative Gribov-Zwanziger quantization of linear covariant gauges journal March 2016
The spin structure of the nucleon journal June 2019
Generalized sum rules for spin-dependent structure functions of the nucleon journal December 2000
Refining the detection of the zero crossing for the three-gluon vertex in symmetric and asymmetric momentum subtraction schemes journal June 2017
Large momentum behavior of the ghost propagator in SU(3) lattice gauge theory journal December 2005
A window on infrared QCD with small expansion parameters journal December 2021
Order α s 4 QCD Corrections to Z and τ Decays journal July 2008
RunDec: a Mathematica package for running and decoupling of the strong coupling and quark masses journal December 2000
Absence of neutrinos on a lattice journal December 1981
Hard Scattering and Gauge/String Duality journal January 2002
Ghost-gluon vertex in the presence of the Gribov horizon journal February 2018
Event shapes in e + e   annihilation and deep inelastic scattering journal February 2004
The decay constants fD and f D s $$ {f}_{D_s} $$ in the continuum limit of Nf = 2 + 1 domain wall lattice QCD journal December 2017
Emergence of mass in the gauge sector of QCD* journal November 2022
Revealing the structure of light pseudoscalar mesons at the electron–ion collider journal May 2021
The nonperturbative functional renormalization group and its applications journal May 2021
On the difficulty of computing higher-twist corrections journal November 1996
A precise determination of αS from lattice QCD journal February 1995
Experimental study of the behavior of the Bjorken sum at very low Q2 journal February 2022
Borel representation of τ hadronic spectral function moments in contour-improved perturbation theory journal May 2022
High precision determination of αs from a global fit of jet rates journal August 2019
A Dyson–Schwinger study of the four-gluon vertex journal March 2015
Gluonic three-point correlations in pure Landau gauge QCD journal March 2014
Covariant quantization of gauge fields without Gribov ambiguity journal November 1981
The $$ \overline{\mathrm{MS}} $$-scheme $$ {\alpha}_s^5 $$ QCD contributions to the Adler function and Bjorken polarized sum rule in the Crewther-type two-fold {β}-expanded representation journal May 2022
Baryon spectrum from superconformal quantum mechanics and its light-front holographic embedding journal February 2015
Higher twists in polarized DIS and the size of the constituent quark journal April 2006
Properties of Regge trajectories journal June 2000
Implications of the principle of maximum conformality for the QCD strong coupling journal October 2017
Selected Science Opportunities for the EicC journal October 2020
Observation of string breaking in QCD journal June 2005
Charmonium: The model journal June 1978
Determination of the effective strong coupling constant αs,g1(Q2) from CLAS spin structure function data journal July 2008
Determination of the strong coupling constant from the charmonium spectrum journal August 1992
Experimental Determination of the Evolution of the Bjorken Integral at Low Q 2 journal November 2004
Absence of neutrinos on a lattice journal July 1981
Which gauges are ghost-free? journal February 1980
Chiral symmetry breaking in continuum QCD journal March 2015
A Solution to Coupled Dyson–Schwinger Equations for Gluons and Ghosts in Landau Gauge journal July 1998
Ghost-antighost-gluon vertex from the Curci-Ferrari model: Two-loop corrections journal December 2020
The Large Hadron–Electron Collider at the HL-LHC journal November 2021
Measurement of the neutron spin structure function gn2 and asymmetry An2 journal July 1997
Über Eigenschaften von Ausbreitungsfunktionen und Renormierungskonstanten quantisierter Felder journal April 1954
On the Invariant Regularization in Relativistic Quantum Theory journal July 1949
Ward identities in gauge theories journal February 1972
$ {\Lambda_{{\overline {\text{MS}} }}} $ from the static potential for QCD with n f  = 2 dynamical quark flavors journal January 2012
Influence of Gribov ambiguities in a class of nonlinear covariant gauges journal November 2015
Accurate Determinations of α s from Realistic Lattice QCD journal July 2005
QCD Coupling from a Nonperturbative Determination of the Three-Flavor Λ Parameter journal September 2017
The QCD renormalization group equation and the elimination of fixed-order scheme-and-scale ambiguities using the principle of maximum conformality journal September 2019
Improved calculation of F2 in electroproduction and xF3 in neutrino scattering to NNLO and determination of αs journal September 2001
Determination of α from static QCD potential with renormalon subtraction journal February 2019
Precise α determination from charmonium sum rules journal July 2020
Fundamentals of the exact renormalization group journal February 2012
Insights into the emergence of mass from studies of pion and kaon structure journal September 2021
Infrared exponent for gluon and ghost propagation in Landau gauge QCD journal June 2002
Experimental Determination of the QCD Effective Charge αg1(Q) journal May 2022
Three-Loop Static Potential journal March 2010
Computation of the strong coupling in QCD with two dynamical flavors journal May 2005
Small parameters in infrared quantum chromodynamics journal December 2017
Nonperturbative comparison of QCD effective charges journal October 2009
Running Coupling Constant from Position-Space Current-Current Correlation Functions in Three-Flavor Lattice QCD journal December 2020
Determination of the QCD Λ Parameter and the Accuracy of Perturbation Theory at High Energies journal October 2016
Towards the five-loop Beta function for a general gauge group journal July 2016
Nonperturbative study of the four gluon vertex journal September 2014
QCD forces and heavy quark bound states journal March 2001
Hadronic Spectra and Light-Front Wave Functions in Holographic QCD journal May 2006
Gauge Coupling β Functions to Four-Loop Order in the Standard Model journal February 2020
Centre vortex removal restores chiral symmetry journal November 2017
An analogue model for KSV theory journal July 1970
Lattice Gluon Propagator and One-Gluon-Exchange Potential journal April 2019
Drawing insights from pion parton distributions journal March 2020
On-Shell Asymptotics of Non-Abelian Gauge Theories journal August 1975
pQCD running couplings finite and monotonic in the infrared: when do they reflect the holomorphic properties of spacelike observables? journal January 2021
The static potential in QCD — a full two-loop calculation journal September 1997
QCD at finite temperature and chemical potential from Dyson–Schwinger equations journal March 2019
Analytic structure of QCD propagators in Minkowski space journal December 2016
High-Precision Lattice QCD Confronts Experiment journal January 2004
Physical renormalization schemes and grand unification journal May 2004
Ultraviolet Behavior of Non-Abelian Gauge Theories journal June 1973
Light mesons in QCD and unquenching effects from the 3PI effective action journal February 2016
Two-loop QCD vertices and three-loop MOM β functions journal December 2000
Infrared behavior of non-Abelian gauge theories journal June 1976
Hadronic unquenching effects in the quark propagator journal November 2007
Gluon propagator in linear covariant R ξ gauges journal August 2018
Chiral Dynamics in Nucleons and Nuclei journal June 1995
Screened massive expansion of the quark propagator in the Landau gauge journal October 2021
Leading-twist parton distribution amplitudes of S -wave heavy-quarkonia journal February 2016
Complete renormalization of QCD at five loops journal March 2017
Charge renormalization group in quantum field theory journal May 1956
Lattice-motivated holomorphic nearly perturbative QCD journal May 2017
Collider physics at the precision frontier journal August 2021
Dynamical origin of the refinement of the Gribov-Zwanziger theory journal September 2011
Static QCD Potential at Three-Loop Order journal March 2010
The static potential in QCD to two loops journal February 1999
Probing the singularities of the Landau-Gauge gluon and ghost propagators with rational approximants journal February 2023
Kaon and pion parton distributions journal November 2020
High-precision c and b masses, and QCD coupling from current-current correlators in lattice and continuum QCD journal August 2010
SU(3)center vortices underpin confinement and dynamical chiral symmetry breaking journal September 2012