Chiral effective field theory for few-nucleon systems: a new pertubative formulation and Pade summation.

强相互作用的手征有效场理论适用于低能领域，其中的基本理论，量子色动力学，不能解决。现有的成功应用，这种方法的少核子部门使用的数值方法，是基于截断正则化。这种方法有一个缺点，它违反了基本的对称性。虽然对称性破缺的贡献形式上是高阶的，但数值计算不允许准确地估计它们的影响。另一个重要的问题是，由于违反了基本的对称性，在这种形式主义中包含电磁相互作用是非常有问题的。最近，我们提出了一种新的保对称性的手征有效场论方法。这种方法有一个重要的优点，它保留了理论的所有对称性。在这个项目中，我们建议联合收割机的优点，保持框架的新配方的方法与核子核子相互作用的微扰介子，最近已建议由Beane，Kaplan和Vuorinen。

Chiral effective field theory of strong interactions is applicable to the low energy sector, where the fundamental theory, the Quantum Chromodynamics, cannot be solved. Existing successful application of this approach to the few-nucleon sector uses the numerical methods and is based on the cutoff regularization. This method has a drawback that it violates the underlying symmetries. While the symmetry breaking contributions are formally of a higher order, the numerical calculations do not allow to accurately estimate their effect. Another nontrivial problem, following from the violation of underlying symmetries, is that the inclusion of the electromagnetic interaction within this formalism is very problematic. Recently we have suggested a new symmetry-preserving approach to chiral effective field theory. This approach has an important advantage that it preserves all symmetries of the theory. In this project, we propose to combine the advantages of the symmetry-preserving framework with the new formulation of the approach for nucleon-nucleon interaction with perturbative pions that has been suggested recently by Beane, Kaplan and Vuorinen.