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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); USDOE Office of Nuclear Energy (NE)
Grant/Contract Number:
AC05-06OR23177; AC02-76SF00515; 12135007
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, Vol. 134; ISSN 0146-6410
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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Renormalization-scheme-invariant QCD and QED: The method of effective charges journal May 1984
Alternative refined Gribov-Zwanziger Lagrangian journal October 2010
The QCD running coupling journal September 2016
Experimental study of isovector spin sum rules journal August 2008
Calculation of electroproduction to NNLO and precision determination of αs journal December 1999
The generalized scheme-independent Crewther relation in QCD journal July 2017
On the renormalizability and unitarity of the Curci-Ferrari model for massive vector bosons journal January 1996
Testing perturbation theory on the Nf=0 static quark potential journal December 2001
Hadronic Regge trajectories: Problems and approaches journal February 2001
The gell-mann-low function of QCD in the three-loop approximation journal June 1980
Transverse force on transversely polarized quarks in longitudinally polarized nucleons journal November 2016
Running coupling and the Λ parameter from SU(3) lattice simulations journal January 1993
SU(3) Yang Mills theory at small distances and fine lattices journal January 2018
Deconfinement transition in SU( N ) theories from perturbation theory journal March 2015
QCD at finite temperature and chemical potential from Dyson–Schwinger equations journal March 2019
Gauge-invariant three-gluon vertex in QCD journal November 1989
α s and the τ hadronic width: fixed-order, contour- improved and higher-order perturbation theory journal September 2008
Non-perturbative determination of the Λ-parameter in the pure SU(3) gauge theory from the twisted gradient flow coupling journal December 2017
Small-distance-behaviour analysis and Wilson expansions journal March 1971
High-precision c and b masses, and QCD coupling from current-current correlators in lattice and continuum QCD journal August 2010
Connecting the hadron mass scale to the fundamental mass scale of quantum chromodynamics journal November 2015
Elimination of Ghosts in Propagators journal November 1958
Three-Loop Static Potential journal March 2010
On the Green's functions of quantized fields. I journal July 1951
Static QCD Potential at Three-Loop Order journal March 2010
On the Green's functions of quantized fields. II journal July 1951
High statistics determination of the strong coupling constant in Taylor scheme and its OPE Wilson coefficient from lattice QCD with a dynamical charm journal January 2014
On the analytically-improved running coupling in QCD journal May 2022
Symmetry, symmetry breaking, and pion parton distributions journal March 2020
Quantum superconformal model in (1, 2) space journal September 1983
Determination of αs from hadronic event shapes measured on the Z0 resonance journal June 1992
Artificial dynamical effects in quantum field theory journal May 2022
Infrared propagators of Yang-Mills theory from perturbation theory journal November 2010
Is the QCD ghost dressing function finite at zero momentum ? journal June 2006
Scale-setting, flavor dependence, and chiral symmetry restoration journal June 2017
Gluon propagator in Feynman gauge by the method of stationary variance journal November 2014
QCD formulation of the tau decay and determination of ΛMS¯ journal August 1988
Centre vortex removal restores chiral symmetry journal November 2017
Lattice gluodynamics computation of Landau-gauge Green's functions in the deep infrared journal June 2009
Dynamical mass generation in continuum quantum chromodynamics journal September 1982
Lattice three-gluon vertex in extended kinematics: Planar degeneracy journal March 2023
The S Matrix in Quantum Electrodynamics journal June 1949
Quantum chromodynamics journal February 1978
Universal effective hadron dynamics from superconformal algebra journal August 2016
The relativistic bound state problem in QCD: transverse lattice methods journal January 2002
The background field method beyond one loop journal July 1981
Ghost dynamics in the soft gluon limit journal September 2021
A precise determination of the running coupling in the SU(3) Yang-Mills theory journal January 1994
On some ambiguities in the method of effective charges journal July 1989
QCD phase structure at finite temperature and density journal March 2020
Two-loop calculation of Yang-Mills propagators in the Curci-Ferrari model journal August 2019
Exclusive processes in perturbative quantum chromodynamics journal November 1980
More on the nonperturbative Gribov-Zwanziger quantization of linear covariant gauges journal March 2016
SU(3)center vortices underpin confinement and dynamical chiral symmetry breaking journal September 2012
Baryon spectrum from superconformal quantum mechanics and its light-front holographic embedding journal February 2015
Fundamentals of the exact renormalization group journal February 2012
Update: Accurate determinations of α s from realistic lattice QCD journal December 2008
Light-cone-quantized QCD in 1+1 dimensions journal June 1990
Determination of the strong coupling constant using inclusive jet cross section data from multiple experiments journal January 2019
Precision measurement of the proton and deuteron spin structure functions g2 and asymmetries A2 journal January 2003
Inelastic Electron-Proton and γ -Proton Scattering and the Structure of the Nucleon journal September 1969
Measurements of the Proton and Deuteron Spin Structure Function g 2 and Asymmetry A 2 journal January 1996
α s and | V cs | determination, and CKM unitarity test, from W decays at NNLO journal December 2016
Testing QCD with τ decays journal September 1992
Gluonic three-point correlations in pure Landau gauge QCD journal March 2014
Ghost-gluon coupling, power corrections, and Λ MS ¯ from lattice QCD with a dynamical charm journal February 2012
Lattice-motivated QCD coupling and hadronic contribution to muon g − 2 journal April 2021
Borel representation of τ hadronic spectral function moments in contour-improved perturbation theory journal May 2022
Measurement of $$\hbox {t}{\bar{\hbox {t}}}$$ normalised multi-differential cross sections in $${\text {p}}{\text {p}} $$ collisions at $$\sqrt{s}=13\,{\text {TeV}} $$, and simultaneous determination of the strong coupling strength, top quark pole mass, and parton distribution functions journal July 2020
Determination of the QCD coupling from the static energy and the free energy journal December 2019
Local gauge transformation for the quark propagator in an SU(N) gauge theory journal April 2016
Exact Sum Rule for Nucleon Magnetic Moments journal May 1966
Deep Inelastic sum Rules at the Boundaries Between Perturbative and Nonperturbative qcd journal September 2005
Hadronic unquenching effects in the quark propagator journal November 2007
Measurements of energy correlations ine + e ??hadrons journal September 1984
Infrared Behavior and Fixed Points in Landau-Gauge QCD journal October 2004
Energy–energy correlation in electron–positron annihilation at NNLL + NNLO accuracy journal November 2017
Measurement of the neutron spin structure function gn2 and asymmetry An2 journal July 1997
Ward identities in gauge theories journal February 1972
Eliminating the Renormalization Scale Ambiguity for Top-Pair Production Using the Principle of Maximum Conformality journal July 2012
The renormalization group and the ε expansion journal August 1974
Threefold complementary approach to holographic QCD journal February 2014
Infrared exponent for gluon and ghost propagation in Landau gauge QCD journal June 2002
Dyson–Schwinger Equations: A Tool for Hadron Physics journal June 2003
Vortex structures in pureSU(3)lattice gauge theory journal January 2004
Confinement contains condensates journal June 2012
Mesons in a relativized quark model with chromodynamics journal July 1985
Renormalization group improved perturbative QCD journal September 1980
Measurement of α s ( Q 2 ) from the Gross–Llewellyn Smith Sum Rule journal October 1998
Indirect determination of the Kugo-Ojima function from lattice data journal November 2009
Semileptonic transitions: B() → π(K); D → K; D → π,K; and K → π journal January 2022
Symmetry preserving truncations of the gap and Bethe-Salpeter equations journal May 2016
Spectral functions of confined particles journal February 2020
The Nf=0 heavy quark potential from short to intermediate distances journal February 2002
Preliminary Calculation of α S from Green Functions with Dynamical Quarks journal January 2002
On the interface between perturbative and nonperturbative QCD journal June 2016
Determination of Λ MS ¯ ( n f = 2 ) and analytic parametrization of the static quark-antiquark potential journal December 2018
Probing an intrinsically flavorful ALP via tau-lepton flavor physics journal May 2022
The next-next-to-leading QCD approximation for non-singlet moments of deep inelastic structure functions journal September 1994
Computation of the running coupling in the SU(2) Yang-Mills theory journal January 1993
The theory of quark confinement journal August 1999
Strings, monopoles, and gauge fields journal December 1974
Further evidence for zero crossing on the three gluon vertex journal October 2016
Three-loop beta function and non-perturbative α s in asymmetric momentum scheme journal December 1998
Running coupling in Yang-Mills theory: A flow equation study journal July 2002
FLAG Review 2021 journal October 2022
Feasibility Studies for Single Transverse-Spin Asymmetry Measurements at a Fixed-Target Experiment Using the LHC Proton and Lead Beams (AFTER@LHC) journal May 2017
Measurement of α s ( M Z 2 ) from hadronic event observables at the Z 0 resonance journal February 1995
Two-loop diagrams in Yang-Mills theory journal June 1974
Non-perturbative power corrections to ghost and gluon propagators journal January 2006
Probing the singularities of the Landau-Gauge gluon and ghost propagators with rational approximants journal February 2023
Perturbative expansion of τ hadronic spectral function moments and α s extractions journal January 2013
On the difficulty of computing higher-twist corrections journal November 1996
Applications of the Chiral U ( 6 ) U ( 6 ) Algebra of Current Densities journal August 1966
Which gauges are ghost-free? journal February 1980
Running coupling constant of ten-flavor QCD with the Schrödinger functional method journal April 2011
Generalized Gerasimov-Drell-Hearn sum rule for the proton-neutron difference in chiral perturbation theory journal April 2001
Generalized sum rules for spin-dependent structure functions of the nucleon journal December 2000
On the IR behaviour of the Landau-gauge ghost propagator journal June 2008
Nonperturbative QCD, Gauge-Fixing, Gribov Copies and the Lattice journal January 2003
A study of energy-energy correlations ine + e ? annihilations at $$\sqrt s = 34.6$$ GeV journal September 1985
Testing the Landau gauge operator product expansion on the lattice with a A 2 condensate journal April 2001
Structure of the neutral pion and its electromagnetic transition form factor journal April 2016
The running coupling from lattice gauge theory journal June 1992
Systematic All-Orders Method to Eliminate Renormalization-Scale and Scheme Ambiguities in Perturbative QCD journal May 2013
Fourth-order QCD renormalization group quantities in the V scheme and the relation of the β function to the Gell-Mann–Low function in QED journal September 2015
Über Eigenschaften von Ausbreitungsfunktionen und Renormierungskonstanten quantisierter Felder journal April 1954
Two-loop corrections to the QCD propagators within the Curci-Ferrari model journal November 2021
Determination of α(Mz) from an hyperasymptotic approximation to the energy of a static quark-antiquark pair journal September 2020
RunDec: a Mathematica package for running and decoupling of the strong coupling and quark masses journal December 2000
Asymptotic freedom in parton language journal August 1977
The quark-gluon vertex in Landau gauge bound-state studies journal May 2015
Measurements of αs in e+e− annihilation at √s=53.3 GeV and 59.5 GeV journal August 1989
Exposing strangeness: Projections for kaon electromagnetic form factors journal August 2017
Strong coupling constant and quark masses from lattice QCD journal July 2020
Factorization and asymptotic behaviour of pion form factor in QCD journal July 1980
Strong coupling from non-equilibrium Monte Carlo simulations journal July 2020
Revealing the structure of light pseudoscalar mesons at the electron–ion collider journal May 2021
Origin of the Proton Mass journal January 2023
Analysis of nucleon electromagnetic form factors from light-front holographic QCD: The spacelike region journal January 2017
Gerasimov-Drell-Hearn sum rule and related integrals journal April 2001
γ * γ η , η transition form factors journal January 2019
The three-loop relation between the and the pole quark masses journal June 2000
Dynamical chiral symmetry breaking, Goldstone’s theorem, and the consistency of the Schwinger-Dyson and Bethe-Salpeter equations journal October 1995
Process-independent strong running coupling journal September 2017
Bridging a gap between continuum-QCD and ab initio predictions of hadron observables journal March 2015
Small parameters in infrared quantum chromodynamics journal December 2017
Kaon and pion parton distributions journal November 2020
Screened massive expansion of the quark propagator in the Landau gauge journal October 2021
Infrared facets of the three-gluon vertex journal July 2021
Analytical approximations for real values of the Lambert W-function journal August 2000
Electron-ion collider in China journal June 2021
Strong coupling from e + e hadrons below charm journal October 2018
Second order gluon polarization for SU(N) theory in a linear covariant gauge journal October 2015
Nonperturbative properties of Yang–Mills theories journal October 2020
Experimental study of the behavior of the Bjorken sum at very low Q2 journal February 2022
Dual-symmetric theory of hadrons.—I journal October 1970
Perturbative QCD corrections to the ratio R for τ decay journal March 1989
Covariant quantization of gauge fields without Gribov ambiguity journal November 1981
Dual-symmetric theory of hadrons: II.—Baryons journal October 1970
On a class of Lagrangian models for massive and massless Yang-mills fields journal March 1976
Measurement of the proton and deuteron spin structure functions g2 and asymmetry A2 journal July 1999
Problems on Lattice Gauge Fixing journal August 2001
Exact N3LO results for qq′ → H + X journal July 2015
The running coupling of QCD with four flavors journal November 2010
Can the QCD running coupling have a causal analyticity structure? journal July 1998
Strong coupling from hadronic τ decays: A critical appraisal journal February 2017
The deuteron spin-dependent structure function <mml:math altimg="si1.gif" overflow="scroll" xmlns:xocs="http://www.elsevier.com/xml/xocs/dtd" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.elsevier.com/xml/ja/dtd" xmlns:ja="http://www.elsevier.com/xml/ja/dtd" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:tb="http://www.elsevier.com/xml/common/table/dtd" xmlns:sb="http://www.elsevier.com/xml/common/struct-bib/dtd" xmlns:ce="http://www.elsevier.com/xml/common/dtd" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:cals="http://www.elsevier.com/xml/common/cals/dtd"><mml:msubsup><mml:mi>g</mml:mi><mml:mn>1</mml:mn><mml:mi>d</mml:mi></mml:msubsup></mml:math> and its first moment journal March 2007
Towards the five-loop Beta function for a general gauge group journal July 2016
Five-Loop Running of the QCD Coupling Constant journal February 2017
First results on the running coupling in QCD with two massless flavours journal August 2001
Ghost-antighost-gluon vertex from the Curci-Ferrari model: Two-loop corrections journal December 2020
Hamiltonian formulation of Wilson's lattice gauge theories journal January 1975
A Solution to Coupled Dyson–Schwinger Equations for Gluons and Ghosts in Landau Gauge journal July 1998
An Identity in Quantum Electrodynamics journal April 1950
A no-go theorem for regularizing chiral fermions journal October 1981
Local and renormalizable action from the gribov horizon journal September 1989
REvolver: Automated running and matching of couplings and masses in QCD journal January 2022
Strong Coupling Constant with Flavor Thresholds at Four Loops in the Modified Minimal-Subtraction Scheme journal September 1997
A method for getting a finite $$\alpha $$ α in the IR region from an all-order beta function journal November 2017
Measurement of the triple-differential dijet cross section in proton-proton collisions at $$\sqrt{s}=8\,\text {TeV} $$ s = 8 TeV and constraints on parton distribution functions journal November 2017
A determination of? s( $$M_{Z^0 } $$ ) at LEP using resummed QCD calculations journal March 1993
Precision Measurement of the Proton Spin Structure Function g 1 p journal January 1995
Discretization effects on renormalized gauge-field Green’s functions, scale setting, and the gluon mass journal December 2018
Nucleon axial form factor at large momentum transfers journal October 2022
Colloquium : Roper resonance: Toward a solution to the fifty year puzzle journal March 2019
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
Pinch technique: Theory and applications journal August 2009
Precision Determination of the Neutron Spin Structure Function g 1 n journal July 1997
Schwinger mechanism for gluons from lattice QCD journal June 2023
On the Invariant Regularization in Relativistic Quantum Theory journal July 1949
The three-loop QCD β-function and anomalous dimensions journal April 1993
Experimental determination of the effective strong coupling constant journal July 2007
Accurate Determinations of α s from Realistic Lattice QCD journal July 2005
Reconciling the contour-improved and fixed-order approaches for τ hadronic spectral moments. Part I. Renormalon-free gluon condensate scheme journal July 2022
Quantum Electrodynamics at Small Distances journal September 1954
NLO PDFs from the ABMP16 fit journal June 2018
High precision determination of the Q 2 evolution of the Bjorken sum journal July 2014
The 3-loop QCD calculation of the moments of deep inelastic structure functions journal May 1997
Toward TeV Conformality journal February 2010
From spectroscopy to the strong coupling constant with heavy Wilson quarks journal July 1995
Broken Scale Invariance in Scalar Field Theory journal October 1970
Measurement of the deuteron spin structure function g1d(x) for 1 (GeV/c)2<Q2<40 (GeV/c)2 journal September 1999
The gradient flow coupling at high-energy and the scale of SU(3) Yang–Mills theory journal August 2019
A window on infrared QCD with small expansion parameters journal December 2021
Unified Description of Polarized and Unpolarized Quark Distributions in the Proton journal February 2020
The static potential in QCD — a full two-loop calculation journal September 1997
Strong coupling constant from moments of quarkonium correlators revisited journal January 2022
Precise determination of αs from relativistic quarkonium sum rules journal March 2020
Chiral symmetry breaking in continuum QCD journal March 2015
Strong coupling constant from Adler function in lattice QCD journal October 2016
Insights into the emergence of mass from studies of pion and kaon structure journal September 2021
Harmonic-Oscillator Analogy for the Veneziano Model journal September 1969
Dyson-Schwinger equations and their application to hadronic physics journal January 1994
Violations of quark-hadron duality in low-energy determinations of αs journal July 2022
One-loop unquenched three-gluon and ghost-gluon vertices in the Curci-Ferrari model journal May 2022
Observation of string breaking in QCD journal June 2005
A Dyson–Schwinger study of the four-gluon vertex journal March 2015
αs from the non-perturbatively renormalised lattice three-gluon vertex journal September 1997

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