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
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) R1-6 Testing Fundamental Symmetries II (DTP-PPD-DNP) / Tests de symétries fondamentales II (DPT-PPD-DPN)


Mr Tristan Sullivan (University of British Columbia)


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))


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

Presentation materials

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