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 and valence-quark DFs.
Cite
@article{arxiv.2103.03960,
title = {Distribution amplitudes of light diquarks},
author = {Ya Lu and Daniele Binosi and Minghui Ding and Craig D. Roberts and Hui-Yu Xing and Chang Xu},
journal= {arXiv preprint arXiv:2103.03960},
year = {2021}
}
Comments
8 pages, 2 figures, 1 table. Accepted for publication in Eur. Phys. J. A (Lett)