Extraction of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.gif" overflow="scroll"><mml:msub><mml:mrow><mml:mi>α</mml:mi></mml:mrow><mml:mrow><mml:mi>s</mml:mi></mml:mrow></mml:msub></mml:math> from deep inelastic scattering at large x

Courtoy, Aurore; Liuti, Simonetta

doi:10.1016/j.physletb.2013.08.058

Cited by 30 publications

(13 citation statements)

References 55 publications

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“…Relations (17), (18), (19), and (21) make it possible to show how there arises the Q 2 dependence of G E and G M in the HSM of pQCD and explain the results of polarization experiments at JLab.…”

Section: The Q 2 Dependence Of the Sachs Ffs Ge And Gmmentioning

confidence: 97%

“…We denote the number of such ways as n Note due to Eqs. (18), (19) at τ ≪ 1 (τ ≫ 1) the quark transition without (with) spin-flip dominates. Therefore, the sets (0,1) and (2,3) with the minimal and maximal number of spin-flip quarks are realized at τ ≪ 1 and τ ≫ 1, respectively.…”

Section: The Q 2 Dependence Of the Sachs Ffs Ge And Gmmentioning

confidence: 99%

“…It was first observed in work [16] that the proton magnetic FF, G M , follows the asymptotic pQCD predictions of [17,18] and Q 4 G M becomes nearly constant (with the logarithmic accuracy, modulo log(Q 2 ) factors) starting at Q 2 ≈ 9 GeV 2 . The answer to the question what is in general admitted at present on the onset of pQCD can be found in [19][20][21]. In Refs.…”

Section: Introductionmentioning

confidence: 99%

“…In Refs. [19,20], based on using completely different approaches, it is shown that the point of transition from non-perturbative QCD to pQCD correspond to a momentum scale Q 0 ∼ 1 GeV. For this reason we will below assume that HSM of pQCD starts at the lower boundary of the considered region, i.e.…”

Section: Introductionmentioning

confidence: 99%

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Alternative way to understand the unexpected results of the JLab polarization experiments to measure the Sachs form factors ratio

Galynskii

Kuraev

2014

Phys. Rev. D

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Alternative way to understand the unexpected results of the JLab polarization experiments to measure the Sachs form factors ratio In the one-photon exchange approximation we discuss questions related to the interpretation of unexpected results of the JLab polarization experiments to measure the Sachs form factors ratio GE/GM in the region 1.0 ≤ Q 2 ≤ 8.5 GeV 2 . For this purpose, we developed an approach which essentially is a generalization of the constituent-counting rules of the perturbative QCD (pQCD) for the case of massive quarks. We assume that at the lower boundary of the considered region the hard-scattering mechanism of pQCD is realized. Within the framework of the developed approach we calculated the hard kernel of the proton current matrix elements J ). This allows us to state that (i) around the lower boundary of the considered region, the leading scaling behavior of the Sachs form factors has the form GE, GM ∼ 1/Q 6 , (ii) the dipole dependence (GE, GM ∼ 1/Q 4 ) is realized in the asymptotic regime of pQCD when τ ≫ 1 (τ = Q 2 /4M 2 ) in the case when the quark transitions with spin-flip dominate, (iii) the asymptotic regime of pQCD in the JLab experiments has not yet been achieved, and (iv) the linear decrease of the ratio GE/GM at τ < 1 is due to additional contributions to J δ,δ p by spin-flip transitions of two quarks and an additional contribution to J −δ,δ p by spin-flip transitions of three quarks.

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Section: The Q 2 Dependence Of the Sachs Ffs Ge And Gmmentioning

confidence: 97%

Section: The Q 2 Dependence Of the Sachs Ffs Ge And Gmmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Alternative way to understand the unexpected results of the JLab polarization experiments to measure the Sachs form factors ratio

Galynskii

Kuraev

2014

Phys. Rev. D

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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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Evaluations of Low-Energy Physical Quantities in QCD with IR Freezing of the Coupling

Cvetič

2014

Few-Body Syst

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Extraction of αs from deep inelastic scattering at large x

Cited by 30 publications

References 55 publications

Alternative way to understand the unexpected results of the JLab polarization experiments to measure the Sachs form factors ratio

Alternative way to understand the unexpected results of the JLab polarization experiments to measure the Sachs form factors ratio

Gluon propagator in fractional analytic perturbation theory

Evaluations of Low-Energy Physical Quantities in QCD with IR Freezing of the Coupling

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