Parton distribution amplitudes: revealing diquarks in the proton and Roper resonance

Abstract

We present the first quantum field theory calculation of the pointwise behaviour of the leading-twist parton distribution amplitudes (PDAs) of the proton and its lightest radial excitation. The proton's PDA is a broad, concave function, whose maximum is shifted relative to the peak in QCD's conformal limit expression for this PDA; an effect which signals the presence of both scalar and pseudovector diquark correlations in the nucleon, with the scalar generating around 60% of the proton's normalisation. The radial-excitation is constituted similarly, and the pointwise form of its PDA, which is negative on a material domain, is the result of marked interference between the contributions from both types of diquark; particularly, the locus of zeros that highlights its character as a radial excitation. These features originate with the emergent phenomenon of dynamical chiral-symmetry breaking in the Standard Model.

5 pages, 2 figures

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Cited by in corpus (26)

• Diquark Correlations in Hadron Physics: Origin, Impact and Evidence
• Spectrum of light- and heavy-baryons
• Empirical Consequences of Emergent Mass
• Light-cone distribution amplitudes of octet baryons from lattice QCD
• Impressions of the Continuum Bound State Problem in QCD
• Nucleon-to-Roper electromagnetic transition form factors at large-$Q^2$
• Strong QCD Insights from Excited Nucleon Structure Studies with CLAS and CLAS12
• Nucleon elastic form factors at accessible large spacelike momenta
• Heavy quarkonia in a contact interaction and an algebraic model: mass spectrum, decay constants, charge radii and elastic and transition form factors
• Exploring twist-2 GPDs through quasi-distributions in a diquark spectator model
• Transition form factors: ${\gamma }^{\ast }+p\to \Delta (1232)$, $\Delta (1600)$
• Parton distributions of light quarks and antiquarks in the proton
• Pion and kaon valence quark distribution functions from Dyson-Schwinger equations
• Spectrum and structure of octet and decuplet baryons and their positive-parity excitations
• An introductory lecture on Generalised Parton Distributions
• Going to the light front with contour deformations
• N* Structure and Strong QCD
• Fermion and Photon gap-equations in Minkowski space within the Nakanishi Integral Representation method
• Distribution amplitudes of light diquarks
• Theory introduction to baryon spectroscopy
• Polarised parton distribution functions and proton spin
• Charmonium decays of beauty baryons in the perturbative QCD approach
• Revealing pion and kaon structure via generalised parton distributions
• Nucleon-to-Resonance Form Factors at Large Photon Virtualities
• Light-cone distribution amplitudes of the nucleon and $\Delta$ baryon
• Hybrid renormalization in lattice calculation of baryon LCDAs