Search Results - "Stefanis, N. G."

On the Pion Distribution Amplitude: Derivation, Properties, Predictions by Stefanis, N. G., Mikhailov, S. V., Pimikov, A. V.

“…We provide an in-depth analysis of the π distribution amplitude in terms of two different Gegenbauer representations. Detailed predictions for the π - γ…”
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Rho Meson Distribution Amplitudes from QCD Sum Rules with Nonlocal Condensates by Pimikov, A. V., Mikhailov, S. V., Stefanis, N. G.

“…The leading-twist distribution amplitude for the longitudinal rho-meson was studied using QCD Sum Rules with nonlocal condensates and a spectral density which…”
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Round table: Nucleon tomography. What can we do better today than Rutherford 100 years ago? by Stefanis, N. G., Alexandrou, Constantia, Horn, Tanja, Moutarde, Hervé, Scimemi, Ignazio

“…A survey is presented on the current status of 3D nucleon tomography. Several research frontiers are addressed that dominate modern physics from theory to…”
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Key Features of the TMD Soft-Factor Structure by Vladimirov, A., Stefanis, N. G.

“…We show that the geometry of the Wilson lines, entering the operator definition of the transverse-momentum dependent parton distributions and that of the soft…”
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Identifying the Universal Part of TMDs by Van der Veken, F. F., Stefanis, N. G.

“…We attempt to identify a path layout in the definition of transverse-momentum-dependent T-odd parton distribution functions (TMD)s which combines features of…”
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Theoretical Description and Measurement of the Pion–Photon Transition Form Factor by Mikhailov, S. V., Pimikov, A. V., Stefanis, N. G.

“…Detailed predictions for the scaled pion–photon transition form factor are given, derived with the method of light-cone sum rules and using pion distribution…”
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Higher-order QCD perturbation theory in different schemes: from FOPT to CIPT to FAPT by Bakulev, A. P., Mikhailov, S. V., Stefanis, N. G.

“…Results on the resummation of non-power-series expansions of the Adler function of a scalar, D S , and a vector, D V , correlator are presented within…”
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Comparing antithetic trends of data for the pion-photon transition form factor by Bakulev, A. P., Mikhailov, S. V., Pimikov, A. V., Stefanis, N. G.

“…We perform a comparative theoretical study of the data at spacelike momentum transfer for the gamma * gamma + or - [pi] super(0) transition form factor, just…”
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Form factor π0γγ in lightcone sum rules combined with renormalization-group summation vs experimental data by Ayala, C, Mikhailov, S V, Pimikov, A V, Stefanis, N G

“…We consider the lightcone sum-rule (LCSR) description of the pionphoton transition form factor in combination with the renormalization group of QCD. The…”
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World-line techniques for resumming gluon radiative corrections at the cross-section level by Karanikas, A.I., Ktorides, C.N., Stefanis, N.G.

“…We employ the Polyakov world-line path-integral version of QCD to identify and resum at leading perturbative order enhanced radiative gluon contributions to…”
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Improved estimates of the pion-photon transition form factor in the (1 ≤ Q2 ≤ 5) GeV2 range and their theoretical uncertainties by Mikhailov, S V, Pimikov, A V, Stefanis, N G

“…We consider the pion-photon transition form factor at low to intermediate spacelike momenta within the theoretical framework of light-cone sum rules. We derive…”
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Duality between different mechanisms of QCD factorization in γ γ collisions by Anikin, I. V., Cherednikov, I. O., Stefanis, N. G., Teryaev, O. V.

“…We study the phenomenon of duality in hard exclusive reactions to which QCD factorization applies. Considering “two-photon”-like processes in the scalar φE3…”
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Nucleon distribution amplitude: the heterotic solution by STEFANIS, N. G, BERGMANN, M

“…We present a new nucleon distribution amplitude which amalgamates features of the Chernyak-Ogloblin-Zhitnitsky model with those of the Gari-Stefanis model…”
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QCD-based pion distribution amplitudes confronting experimental data by Bakulev, A.P., Mikhailov, S.V., Stefanis, N.G.

“…We use QCD sum rules with non-local condensates to recalculate more accurately the moments and their confidence intervals of the twist-2 pion distribution…”
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Pion-photon transition form factor in LCSR and tests of asymptotics by Stefanis, N. G

“…Phys. Rev. D 102, 034022 (2020) We study the pion-photon transition form factor (TFF) $F^{\gamma*\gamma\pi^0}(Q^2)$ using a state-of-the art implementation of…”
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Taming Landau singularities in QCD perturbation theory: The analytic approach 2.0 by Stefanis, N. G.

“…The aim of this topical article is to outline the fundamental ideas underlying the recently developed Fractional Analytic Perturbation Theory (FAPT) of QCD and…”
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Renormalization-group improved evolution of the meson distribution amplitude at the two-loop level by Bakulev, Alexander P., Stefanis, N.G.

“…We discuss the two-loop evolution of the flavor-nonsinglet meson distribution amplitude in perturbative QCD. After reviewing previous two-loop computations, we…”
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Form factors and QCD in spacelike and timelike regions by Bakulev, A. P., Radyushkin, A. V., Stefanis, N. G.

“…We analyze the basic hard exclusive processes, the {pi}{gamma}{sup *}{gamma}-transition and the pion and nucleon electromagnetic form factors, and discuss the…”
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What binds quarks together at different momentum scales? A conceptual scenario by Stefanis, N.G.

“…The binding effects of quarks within hadrons are discussed in terms of the pion distribution amplitude over longitudinal momentum fractions. To understand the…”
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Analyticity and power corrections in hard-scattering hadronic functions by Karanikas, A.I., Stefanis, N.G.

“…Demanding the analyticity of hadronic observables (calculated in terms of power series of the running coupling) as a whole, we show that they are free of the…”
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