Speaker
Description
PIONEER is a next-generation pion decay experiment that will run at the Paul Scherrer Institute in Switzerland. The initial goal of PIONEER is to improve the precision of the pion branching ratio measurement $R_{e/\mu} = \frac{\Gamma \left(\pi^{+}\rightarrow e^{+} \nu_{e} (\gamma)\right)}{\Gamma \left(\pi^{+} \rightarrow \mu^{+} \nu_{\mu} (\gamma) \right)}$, a stringent, direct test of lepton flavour universality. To achieve this goal, PIONEER will employ a modern detector based on two key components: an active highly segmented target, and a large acceptance, 19 radiation length calorimeter. Two calorimeter technology options are being compared: LYSO crystals, and liquid xenon (LXe). Our team at TRIUMF is working on the R&D for the LXe option. Recent progress includes designing and testing components for a large LXe prototype detector and advancing simulations of the full calorimeter to assess its performance of decay positron energy and position reconstruction. In this talk, I will present results from GEANT4 simulations and give a status update of the R&D work.
| Keyword-1 | PIONEER |
|---|---|
| Keyword-2 | pion decay |
| Keyword-3 | lepton flavour universality |
