Distribution amplitudes of light diquarks

Abstract

Accumulating evidence indicates that soft quark+quark (diquark) correlations play an important role in the structure and interactions of hadrons constituted from three or more valence-quarks; so, it is worth developing insights into diquark structure. Using a leading-order truncation of those equations needed to solve continuum two-valence-body bound-state problems, the leading-twist two-parton distribution amplitudes (DAs) of light-quark scalar and pseudovector diquarks are calculated. The diquark DAs are narrower and taller than the asymptotic profile that characterises mesons. Consequently, the valence quasiparticles in a diquark are less likely to carry a large light-front fraction of the system's total momentum than those in a meson. These features may both influence the form of baryon DAs and be transmitted to diquark distribution functions (DFs), in which case their impact will be felt, e.g. in the proton's $u$ and $d$ valence-quark DFs.

8 pages, 2 figures, 1 table. Accepted for publication in Eur. Phys. J. A (Lett)

References in corpus (11)

• Baryons as relativistic three-quark bound states
• Abelian anomaly and neutral pion production
• pi- and rho-mesons, and their diquark partners, from a contact interaction
• Natural constraints on the gluon-quark vertex
• Parton distribution amplitudes of light vector mesons
• Elastic electromagnetic form factors of vector mesons
• Nonperturbative light-front Hamiltonian methods
• The soft-gluon limit and the infrared enhancement of the quark-gluon vertex
• Form Factors of the Nucleon Axial Current
• Leading-twist distribution amplitudes of scalar- and vector-mesons
• Excited mesons in a Bethe-Salpeter approach

Cited by in corpus (5)

• Concerning pion parton distributions
• Proton and pion distribution functions in counterpoint
• Parton distributions of light quarks and antiquarks in the proton
• Contact interaction analysis of octet baryon axialvector and pseudoscalar form factors
• $D^{\ast }$ and $D_s^{\ast }$ distribution amplitudes from Bethe-Salpeter wave functions