Leichte und schwere Baryonen im quantenfeldtheoretischen Zugang

我们最近发展了一个洛伦兹协变夸克模型，它在轻夸克区与手征微扰理论的重子区一致，在重夸克区与重夸克有效理论一致。该方法包含了中低能重子结构的主要方面：强子化、禁闭和手征对称性。用受QCD求和规则和协变重子波函数约束的重子三夸克流来模拟重子的内部夸克结构。除了价夸克自由度之外，我们还包括海夸克效应，它是由手征对称性决定的一团伪标量场来参数化的。在拟议的项目中，我们打算对与世界强子设施的实验工作密切相关的轻重子的低能性质进行全面的理论研究：轻重子的电磁和弱结构、独有的重重子衰变、稀有重子衰变和超越标准模的物理。

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.