# 36th Annual International Symposium on Lattice Field Theory

Jul 22 – 28, 2018
Kellogg Hotel and Conference Center
EST timezone

## Determining the Efficacy of different parameterizations of the z-expansion

Jul 27, 2018, 5:50 PM
20m
103 (Kellogg Hotel and Conference Center)

### 103

#### Kellogg Hotel and Conference Center

219 S Harrison Rd, East Lansing, MI 48824
Weak Decays and Matrix Elements

### Speaker

Mr Erik Gustafson (University of Iowa)

### Description

We present a method of examining the efficacy of different formulations of the z-expansion in semileptonic B decays. We examine three different parameterizations of the z-expansion, the BGL, BCL and a recent Padé expansion. Our method involves fitting these parameterizations to the large momentum transfer data ($q^2$ > $17 ~GeV^2$) and seeing how well these parameterizations predict the low momentum transfer region ($q^2$ < $17 ~GeV^2$). This comparison is done using determining chi^2 values for the non-fitted region using the parameters found for the fitted region.

### Primary authors

Mr Erik Gustafson (University of Iowa) Yannick Meurice (U. of Iowa)

 Slides