Leichte und schwere Baryonen im quantenfeldtheoretischen Zugang

我们最近发展了一个Lorentz协变夸克模型，它在轻夸克部分与手征微扰理论的重子部分一致，在重夸克部分与重夸克有效理论一致。导出的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。本文用重子三夸克流模型研究了重子的内部夸克结构，重子三夸克流受QCD求和规则和协变重子波函数的约束。除了价夸克的自由度，我们还包括海夸克的影响，这是由一个由手征对称性所决定的赝标量场云参数化。在这个计划中，我们打算对与世界范围内强子装置的实验工作密切相关的轻重子和重子的低能性质进行全面的理论研究：轻重子的电磁结构和弱结构，专有重子衰变，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.