Experimental determination of the effective strong coupling constant

Deur, A.; Burkert, Volker; Chen, Jianping; Korsch, W.

doi:10.1016/j.physletb.2007.05.015

Cited by 155 publications

(227 citation statements)

References 44 publications

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“…which gives an accurate description of the effective charge α g1 (Q 2 ) determined from the Bjorken sum rule [38,39]. We shall use the perturbative coupling α s (Q 2 ) calculated up to order β 4 in the perturbative series of the β function…”

Section: Nucleon Electromagnetic Form Factors In Light-front Holograpmentioning

confidence: 99%

Superconformal Algebraic Approach to Hadron Structure

et al. 2017

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Abstract. Fundamental aspects of nonperturbative QCD dynamics which are not obvious from its classical Lagrangian, such as the emergence of a mass scale and confinement, the existence of a zero mass bound state, the appearance of universal Regge trajectories and the breaking of chiral symmetry are incorporated from the onset in an effective theory based on superconformal quantum mechanics and its embedding in a higher dimensional gravitational theory. In addition, superconformal quantum mechanics gives remarkable connections between the light meson and nucleon spectra. This new approach to hadron physics is also suitable to describe nonperturbative QCD observables based on structure functions, such as GPDs, which are not amenable to a first-principle computation. The formalism is also successful in the description of form factors, the nonperturbative behavior of the strong coupling and diffractive processes. We also discuss in this article how the framework can be extended rather successfully to the heavy-light hadron sector.

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Section: Nucleon Electromagnetic Form Factors In Light-front Holograpmentioning

confidence: 99%

Superconformal Algebraic Approach to Hadron Structure

et al. 2017

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“…This is analogous to the approaches in Refs. [32][33][34][35][36][37] (also: [38,39]) where nonperturbative contributions are introduced in the specific considered observables.…”

Section: B Nonperturbative Effects In the Gluon Propagatormentioning

confidence: 99%

Gluon propagator in fractional analytic perturbation theory

2014

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We consider the gluon propagator in the Landau gauge at low spacelike momenta and with the dressing function Z(Q 2 ) at the two-loop order. We incorporate the nonperturbative effects by making the (noninteger) powers of the QCD coupling in the dressing function Z(Q 2 ) analytic (holomorphic) via the Fractional Analytic Perturbation Theory (FAPT) model, and simultaneously introducing the gluon dynamical mass in the propagator as motivated by the previous analyses of the Dyson-Schwinger equations. The obtained propagator has behavior compatible with the unquenched lattice data (N f = 2 + 1) at low spacelike momenta 0.4 GeV < Q 10 GeV. We conclude that the removal of the unphysical Landau singularities of the powers of the coupling via the (F)APT prescription, in conjunction with the introduction of the dynamical mass M ≈ 0.62 GeV of the gluon, leads to an acceptable behavior of the propagator in the infrared regime.

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“…[19,20,21,22]. These values represent the first extraction of an effective coupling in the IR region that was obtained by analyzing the data relevant for the study of the GDH sum rule.…”

Section: The Running Coupling Constant From Lxrmentioning

confidence: 99%

“…To extract the coupling constant, the MS expression of the Bjorken sum rule up to the 5th order in alpha (calculated in the MS scheme) was used. In order to compare with our extraction using the F p 2 observable, the finite value for α s (0) found in [19,20,21] was rescaled in [22] assuming the validity of the commensurate scale relations [21] in the entire range of the scale entering the analysis. The agreement with our analysis which is totally independent, is impressive.…”

Section: The Running Coupling Constant From Lxrmentioning

confidence: 99%

ANALYSIS OF α_sFROM THE REALIZATION OF QUARK-HADRON DUALITY

Courtoy

Liuti

2014

Int. J. Mod. Phys. Conf. Ser.

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We present an analysis of the role of the running coupling constant at the intersection of perturbative and nonperturbative QCD in the context of the quark-hadron dualityà la Bloom-Gilman. Our framework will be the unpolarized structure function of the proton in the resonance region. We suggest that the realization of duality is related to the inclusion of nonperturbative effects at the level of the coupling constant. The outcome of our analysis is a smooth transition from perturbative to nonperturbative QCD physics, embodied in the running of the coupling constant at intermediate scales.

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Experimental determination of the effective strong coupling constant

Cited by 155 publications

References 44 publications

Superconformal Algebraic Approach to Hadron Structure

Superconformal Algebraic Approach to Hadron Structure

Gluon propagator in fractional analytic perturbation theory

ANALYSIS OF α_sFROM THE REALIZATION OF QUARK-HADRON DUALITY

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Experimental determination of the effective strong coupling constant

Cited by 155 publications

References 44 publications

Superconformal Algebraic Approach to Hadron Structure

Superconformal Algebraic Approach to Hadron Structure

Gluon propagator in fractional analytic perturbation theory

ANALYSIS OF αsFROM THE REALIZATION OF QUARK-HADRON DUALITY

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ANALYSIS OF α_sFROM THE REALIZATION OF QUARK-HADRON DUALITY