Explicit Model Realizing Parton–hadron Duality

Fiore, R.; Flachi, Antonino; Jenkovszky, L. L.; Lengyel, A.; Magas, V. K.

doi:10.1142/s0217751x12501576

Cited by 5 publications

(4 citation statements)

References 62 publications

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“…To answer the question of the nature of a dual description, two complementary approaches have been adopted. The first is the nonperturbative model's view on the scaling of the structure functions at low-energies [27][28][29]; the second approach consists in a perturbative analysis [9,10,30], that through LxR provides a scenario by which the effect of HTs can be suppressed in a fully quantitative fit at large x. It is this second approach that we will follow in this paper.…”

mentioning

confidence: 99%

Extraction of αs from deep inelastic scattering at large x

Courtoy

Liuti

2013

Physics Letters B

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We present an analysis of the role of the running coupling constant at the intersection of perturbative and nonperturbative QCD. Although the approaches that have been considered so far in these two regimes appear to be complementary to each other, a unified description might derive through the definition of the effective coupling, as they both provide ways of analyzing its freezing at low values of the scale. We extract the effective coupling from all available experimental data on the unpolarized structure function of the proton, F p 2 , at large values of Bjorken x, including the resonance region. We suggest that parton-hadron duality observed in this region can be explained if nonperturbative effects are included in 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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confidence: 99%

Extraction of αs from deep inelastic scattering at large x

Courtoy

Liuti

2013

Physics Letters B

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“…Subsequently, studies of Bloom-Gilman-type duality have been extended to various other observables, including unpolarized neutron structure functions [63], spin-dependent nucleon structure functions [64], γ * p helicity cross sections [65], neutrino scattering [66,67], and nuclear structure functions [68,69]. Models exist that account for both the Veneziano and Bloom-Gilman dualities [70], but a quantitative understanding is still missing. It has long been realized that, when integrating the structure functions over W (or x), duality can be related to QCD through the operator product expansion (OPE).…”

Section: Introductionmentioning

confidence: 99%

“…[87] for additional references to the literature). Phenomenological calculations exploring how exclusive contributions to the final states build up the inclusive structure functions have been made by modelling the resonant contributions [88], as well as combining resonance models with Regge physics [70,89]. Attempts to correlate the behavior of individual resonances with Q 2 with the x dependence of the dual leading twist structure function have been made [72], including for the super-local case of elastic scattering at x ∼ 1, with interesting phenomenological predictions [90][91][92].…”

Section: Introductionmentioning

confidence: 99%

Resonant contributions to inclusive nucleon structure functions from exclusive meson electroproduction data

Blin,

Melnitchouk,

Mokeev

et al. 2021

Preprint

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Nucleon resonance contributions to the inclusive proton F2 and FL structure functions are computed from resonance electroexcitation amplitudes in the mass range up to 1.75 GeV extracted from CLAS exclusive meson electroproduction data. Taking into account for the first time quantum interference effects, the resonance contributions are compared with inclusive proton structure functions evaluated from (e, e X) cross section data and the longitudinal to transverse cross section ratio. Contributions from isospin-1/2 and 3/2 resonances remain substantial over the entire range of photon virtualities Q 2 4 GeV 2 , where their electroexcitation amplitudes have been obtained, and their Q 2 evolution displays pronounced differences in the first, second and third resonance regions. We compare the structure functions in the resonance region with those computed from parton distributions fitted to deep-inelastic scattering data, and extrapolated to the resonance region, providing new quantitative assessments of quark-hadron duality in inclusive electron-proton scattering.

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“…Our goal is rather to check qualitatively the proposed new ways of constructing 3D dual amplitudes and/or SFs (see Ref. [10]).…”

Section: Introductionmentioning

confidence: 99%

On the Interplay between Q2 and t Dependences in Exclusive Diffractive Production of Real Photons and Vector Mesons in ep Collisions

et al. 2012

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We show how the familiar phenomenological way of combining the Q2 (photon virtuality) and t (squared momentum transfer) dependences of the scattering amplitude in Deeply Virtual Compton Scattering (DVCS) [1, 2] and Vector Meson Production (VMP) [2] processes can be understood in an off-mass-shell generalization of dual amplitudes with Mandelstam analyticity [3]. By comparingdifferent approaches, we managed also to constrain the numerical values of the free parameters.

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Explicit Model Realizing Parton–hadron Duality

Cited by 5 publications

References 62 publications

Extraction of αs from deep inelastic scattering at large x

Extraction of αs from deep inelastic scattering at large x

Resonant contributions to inclusive nucleon structure functions from exclusive meson electroproduction data

On the Interplay between Q2 and t Dependences in Exclusive Diffractive Production of Real Photons and Vector Mesons in ep Collisions

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