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.

越来越多的证据表明，软夸克与夸克（双夸克）的相关性在由三个或更多价夸克构成的强子的结构和相互作用中起着重要作用。因此，值得深入研究双夸克结构。使用解决连续二价体束缚态问题所需的那些方程式的前导截断，可以计算轻夸克标量和伪矢量二夸克的前向扭曲两部分分布幅度（DAs）。双夸克DA比介子的渐近分布更窄和更高。因此，与介子相比，双夸克中的价准准粒子不太可能携带整个系统总动量的较大的光前分数。例如。在质子的u和d价夸克DF中。