# 2015 CAP Congress / Congrès de l'ACP 2015

Jun 13 – 19, 2015
University of Alberta
America/Edmonton timezone
Welcome to the 2015 CAP Congress! / Bienvenue au congrès de l'ACP 2015!

## Initial Results from the TRIUMF PIENU Experiment

Jun 18, 2015, 9:15 AM
15m
CCIS 1-140 (University of Alberta)

### CCIS 1-140

#### University of Alberta

Oral (Student, In Competition) / Orale (Étudiant(e), inscrit à la compétition) Particle Physics / Physique des particules (PPD)

### Speaker

Mr Tristan Sullivan (University of British Columbia)

### Description

The $\pi\rightarrow e \nu$ branching ratio $R_\pi= \frac{ \Gamma(\pi\rightarrow e \nu + \pi\rightarrow e \nu \gamma)}{\Gamma(\pi\rightarrow \mu \nu + \pi\rightarrow \mu \nu \gamma)},$ one of the most precisely calculated weak interaction Standard Model observables involving quarks, provides a sensitive test of lepton universality and severe constraints on many new physics scenarios with mass reach up to 1000 TeV. The PIENU experiment at TRIUMF aims to measure $R_\pi$ to a precision of less than 0.1%. Results will be presented from an analysis of a subset of the data with statistical and systematic uncertainties reduced to the 0.2% level, significantly improving on previous experiments. Prospects for analyzing the full data set and further reducing the systematic error will also be discussed.

### Primary author

Douglas Andrew Bryman (University of British Columbia (CA))

### Co-author

PIENU Collaboration (ASU,BNL,Glasgow,KEK,Osaka,TRIUMF,Tsinghua,UBC,UNBC,UNAM,VPI)

### Presentation materials

There are no materials yet.