Speaker
Shao-zhou Jiang
(Guangxi University)
Description
Chiral Lagrangian is a very effective tool to deal with the low-energy pseudoscalar mesons where the low-energy constants (LECs) play the important role and very difficult to be estimated. To increase the precision of chiral Lagrangian, we need to manage the high orders, which include hundreds of LECs. There are numerous operators and constraint conditions in the high orders. Up to now, all of the p6 order structures of the chiral Lagrangian have been given, including the two and three flavors, the normal and anomalous parts, and the tensor sources parts. We review the main methods to search these constraint conditions, emphasis the method to obtain the high orders of chiral Lagrangian, introduce our method to compute all the LECs up to order of p6, with Schwinger-Dyson proper time method and some approximations, including the large-Nc limit, the improved, ladder approximation, and the leading order in dynamical perturbation theory. All the LECs are expressed in terms of the quark self-energy. Finally, we compare our results with others.
Primary authors
Prof.
Qing Wang
(TsingHua University)
Shao-zhou Jiang
(Guangxi University)
