|Speaker:||Xiaochuan Lu (UC Davis)|
|Title:||How to efficiently use effective field theories|
|Date (JST):||Wed, Aug 09, 2017, 13:30 - 14:30|
|Place:||Seminar Room A|
Effective field theory is a useful bridge to connect ultraviolet models of new physics with low energy observables. There are generically three steps in using it--- matching, running, and mapping. I would like to review this procedure, with an emphasis on two useful techniques. First, the covariant derivative expansion allows us to perform calculations in a manifestly gauge-
covariant manner. It can be used to simplify both the matching and the running steps. Second, in order to perform the running and mapping steps most efficiently, one presumably would like to work with a set of complete but independent effective operators --- an operator basis. I will present a systematic method of determining the content of the operator basis.