Leichte und schwere Baryonen im quantenfeldtheoretischen Zugang

我们最近建立了一个洛伦兹协变夸克模型，该模型在轻夸克扇区与手性微扰理论的重子扇区一致，在重夸克扇区与重夸克有效理论一致。推导的方法包含了低能和中能重子结构的主要方面：强子化、约束和手性对称。利用受QCD和规则约束的重子三夸克电流和协变重子波函数对重子内部夸克结构进行了建模。除了价夸克的自由度外，我们还包括了海夸克效应，它是由手性对称所决定的伪标量场云所参数化的。在本项目中，我们打算对轻重子和重重子的低能性质进行全面的理论研究，这与世界范围内的强子实验工作密切相关：轻重子的电磁和弱结构、独占重重子衰变、稀有重子衰变和标准模式以外的物理。

We recently developed a Lorentz covariant quark model which in the light quark sector is consistent with the baryon sector of Chiral Perturbation Theory and in the heavy quark sector with Heavy Quark Effective Theory. The derived approach contains the main aspects of baryon structure at low and intermediate energies: hadronization, confinement and chiral symmetry. The internal quark structure of baryons is modelled by using baryonic three-quark currents constrained by QCD sum rules and covariant baryonic wave functions. In addition to the valence quark degrees of freedom we include the sea-quark effects which are parametrized by a cloud of pseudoscalar fields as dictated by chiral symmetry. In the proposed project we intend to conduct a comprehensive theoretical study of low-energy properties of light and heavy baryons which is closely related to experimental work at world-wide hadron facilities: electromagnetic and weak structure of light baryons, exclusive heavy baryon decays, rare baryon decays and physics beyond the Standard Mode.