论文标题
质子夸克的质量分布来自轻型FADDEEV-BETHE-SALPETER方法
Proton quark distributions from a light-front Faddeev-Bethe-Salpeter approach
论文作者
论文摘要
在价水平上截断的Minkowski空间Faddeev-Bethe-Salpeter方程模型的投影用于研究具有组成夸克的质子结构。该模型的动力学已内置：（i）接触相互作用带来的界限，以及（ii）红外和紫外线相互作用区域的λ_qCD分离。对模型参数进行了微调，以重现质子狄拉克电磁形状和质量。由此，计算了非极化纵向和横向动量分布。进化的非极化价值部分分布的结果表明：（i）明确考虑夸克和diquark的自由度的自由度似乎与之无关，以及（ii）与NNPDF4.0的全局拟合的比较，从nnpdf4.0呼叫的全局拟合中，对于波浪功能超出价值的较高的fock组件。
The projection onto the Light-Front of a Minkowski space Faddeev-Bethe-Salpeter equation model truncated at the valence level is applied to study the proton structure with constituent quarks. The dynamics of the model has built-in: (i) a bound diquark brought by a contact interaction, and (ii) the separation by Λ_QCD of the infrared and ultraviolet interaction regions. The model parameters are fine tuned to reproduce the proton Dirac electromagnetic form factor and mass. From that, the non-polarized longitudinal and transverse momentum distributions were computed. The results for the evolved non-polarized valence parton distributions suggest that: (i) the explicit consideration of the spin degree of freedom of both quark and diquark seems not relevant to it, and (ii) the comparison with the global fit from the NNPDF4.0 calls for higher Fock components of the wave function beyond the valence one.
