Nucleon Form Factors and Distribution Amplitudes in QCD

Abstract

We derive light-cone sum rules for the electromagnetic nucleon form factors including the next-to-leading-order corrections for the contribution of twist-three and twist-four operators and a consistent treatment of the nucleon mass corrections. The essence of this approach is that soft Feynman contributions are calculated in terms of small transverse distance quantities using dispersion relations and duality. The form factors are thus expressed in terms of nucleon wave functions at small transverse separations, called distribution amplitudes, without any additional parameters. The distribution amplitudes, therefore, can be extracted from the comparison with the experimental data on form factors and compared to the results of lattice QCD simulations. A selfconsistent picture emerges, with the three valence quarks carrying 40%:30%:30% of the proton momentum.

27 pages, 7 figures uses revtex

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• Perturbative Calculations of Gravitational Form Factors at Large Momentum Transfer
• Near Threshold Heavy Quarkonium Photoproduction at Large Momentum Transfer
• Electroproduction of the $N^{\ast }(1535)$ nucleon resonance in QCD
• Axial form factor of the nucleon at large momentum transfers
• Transition distribution amplitudes and hard exclusive reactions with baryon number transfer
• Light-cone distribution amplitudes of a light baryon in large-momentum effective theory
• Model-independent calculation of $SU(3{)}_f$ violation in baryon octet light-cone distribution amplitudes
• Nucleon axial form factor at large momentum transfers
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• Branching Fractions of $B$ Meson Decays in Mesogenesis
• Light Cone Distribution Amplitude for the $\Lambda$ Baryon from Lattice QCD
• Higher twist nucleon distribution amplitudes in Wandzura-Wilczek approximation
• Exploring Baryon Resonances with Transition Generalized Parton Distributions: Status and Perspectives
• Emergent phenomena and partonic structure in hadrons
• The Dirac Form Factor Predicts the Pauli Form Factor in the Endpoint Model
• $N^{\ast }(1535)\to N$ transition form-factors due to the axial current
• The decays ${\Lambda }_{b,c}\to N^{\ast }l\nu$ in QCD
• Baryon octet distribution amplitudes in Wandzura-Wilczek approximation
• A Study of Power Suppressed Contributions in $J/\psi \to p\bar{p}$ Decay
• Semileptonic Decay of ${\Xi }_c\to \Xi {\ell }^{+}{\nu }_{\ell }$ From Light-Cone QCD Sum Rules
• Octet negative parity to octet positive parity electromagnetic transitions in light cone QCD
• Study of the ${\Lambda }_b\to N^{\ast }{\ell }^{+}{\ell }^{-}$ decay in light cone sum rules
• Baryon decays $J/\psi \to B\bar{B}$ within the QCD factorisation framework
• ${\gamma }^{\ast }N\to {\Delta }^{+}(1600)$ transition form factors in light-cone sum rules
• Advances in QCD sum rule calculations
• Probing moments of baryon-antibaryon generalized parton distributions at BELLE and FAIR
• Light-cone distribution amplitudes of the nucleon and $\Delta$ baryon
• Light-cone sum rules with $B$-meson distribution amplitudes for the $B\to p$ form factors in $B$-mesogenesis models
• Light-cone sum rule approach for Baryon form factors
• A description of charmonia decays $J/\psi \to B\bar{B}$ within the QCD factorisation framework