Distribution amplitudes of light diquarks

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 equati...

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Bibliographic Details
Published inThe European physical journal. A, Hadrons and nuclei Vol. 57; no. 4
Main Authors Lu, Ya, Binosi, Daniele, Ding, Minghui, Roberts, Craig D., Xing, Hui-Yu, Xu, Chang
Format Journal Article
LanguageEnglish
Published Berlin/Heidelberg Springer Berlin Heidelberg 01.04.2021
Springer Nature B.V
Subjects
Amplitudes
Asymptotic properties
Distribution functions
Elementary excitations
Hadrons
Heavy Ions
Letter
Mesons
Nuclear Fusion
Nuclear Physics
Particle and Nuclear Physics
Partons
Physics
Physics and Astronomy
Quarks
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Summary: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.
ISSN:1434-6001
1434-601X
DOI:10.1140/epja/s10050-021-00427-6