We extract the leading Fock-state light front wave functions of heavy flavor-asymmetric pseudoscalar mesons 𝐷, 𝐵, and 𝐵𝑐 from their Bethe-Salpeter wave functions, based on the Dyson-Schwinger equations approach. We then study their leading-twist parton distribution amplitudes, generalized parton distribution functions, and transverse momentum-dependent parton distributions. The spatial distributions of the quark and antiquark on the transverse plane are presented, along with their charge and energy distributions on the light front. We find that in the considered mesons, the heavier quarks carry most of the longitudinal momentum fraction, resulting in narrow 𝑥 distributions, while the lighter quarks play an active role in shaping the transverse distributions in both spatial and momentum space, exhibiting a duality that embodies characteristics of both light mesons and heavy quarkonium.

中文翻译：

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轻前沿的重风味不对称伪标量介子


我们基于 Dyson-Schwinger 方程方法，从重风味不对称伪标量介子 D、B 和 Bc 的 Bethe-Salpeter 波函数中提取了它们的主要 Fock 态轻前波函数。然后，我们研究了它们的超前扭转 parton 分布幅度、广义 parton 分布函数和横向动量依赖性 parton 分布。给出了夸克和反夸克在横向平面上的空间分布，以及它们在光面上的电荷和能量分布。我们发现，在所考虑的介子中，较重的夸克携带了大部分纵向动量分数，导致狭窄的 x 分布，而较轻的夸克在空间和动量空间中的横向分布中起着积极作用，表现出体现轻介子和重夸科铀特征的二元性。