Rare Pion Decay Workshop

Scientific Programme

Rare pion decays and the PIONEER experiment

Theory and External Talks

Motivations and impact of Pioneer

Specialty Theory
- LFU tests across energy scales
- LFU and models of new physics
- Status and prospects of the first-row CKM unitarity test
- Meson decays as probes of light new physics

External experiments
- NA62 efforts / kaon review
- B decays (expt review)

Previous experiments

• Systematics related to ‘old’ muons (both lingering and from the beam directly)
• Systematics related to muon DIF (in target)
• The best modeling of ‘The Tail’ that we have so far from pienu and pen experience

PSI Beamline

Active Target

• ATAR Technology
• Alternate target possibilities
• Test beam results
• R&D plan
• Electronics
• Invited experts

Calorimetry

• MEG resolution and SiPM annealing update
• LXe R&D plans (Chloe)
• Simulations for open LXe and “segmented” LXe
• Tests of LYSO xtals (UW)
• Simulations of CsI (PEN) alone and CsI + LYSO hybrid (UW)

Tracker

Electronics

• From digitizer ideas to DAQ

Simulations and Proto-Analysis Efforts

Plans going forward