Testing Lepton Flavor Universality with Rare Pion Decays
Dr. Saúl Cuen Rochín, Universidad Autónoma de Sinaloa, Culiacán, Sin., México
The Standard Model (SM) of particle physics is the best available
theoretical framework to predict the subatomic interactions between the
fundamental elements of known matter. The PIENU experiment at TRIUMF makes a
precise measurement for one of the SM\u2019s best calculated predictions
involving the force that governs radioactive decays. If a measurement is
consistent with the SM, better constraints can be set on theories which
extend the SM. In some instances, these constraints can far exceed the reach
of direct searches at high energy colliding beam facilities like the Large
Hadron Collider at CERN. Most remarkably, a deviation from the SM
expectation could imply the presence of new physics effects not included in
the SM. This work describes the analysis of a dataset including 3 million
pi -> e + nue events. Major experimental systematic problems have been
solved, allowing for increased precision by a factor of two over PIENU\u2019s
previous measurement from 2015.
Additionally, a new generation experiment of rare pion decay measurement to
reach SM calculation levels is under consideration and the plan was
presented at SNOWMASS 2020.
https://www.snowmass21.org/docs/files/summaries/RF/SNOWMASS21-RF2_RF3-048.p
df [www.snowmass21.org]
http://hdl.handle.net/2429/69938 [hdl.handle.net]