PIONEER 2nd Reconstruction Workshop

13 Jul 2026, 00:00 → 17 Jul 2026, 18:00 US/Pacific

Room 128 (conference room) (CENPA)

Quentin Buat (University of Washington)

The goal of the workshop is to discuss the current status of the event reconstruction software for the PIONEER experiment.

The workshop is structured with a mix of formal presentation (on Monday and Friday), informal daily catch-up meetings and hands-on time.

We hope to tackle a series of ongoing studies of the PIONEER event reconstruction and LFUV measurement sensitivity studies. 

 

 

ONEchat | Purple.pdf

Monday 13 July

08:30 → 08:40 Introduction

Speakers: Patrick Schwendimann (ETHZ), Quentin Buat (University of Washington)

quentin_buat_pioneer_reco_ws_introduction_2026.pdf

talk_1.mp4

08:40 → 09:10 Day 1: Status of viability campaign

Conveners: Patrick Schwendimann (ETHZ), Quentin Buat (University of Washington)

08:40 Toward 0.01%

Speaker: Quentin Buat (University of Washington)

pioneer_reco_ws_buat.pdf

talk_2.mp4

09:10 → 10:30 Day 1: Test beam simulations

Conveners: Patrick Schwendimann (ETHZ), Quentin Buat (University of Washington)

09:10 piE5 beam and PSM simulations

Speaker: Kolja Frahm (ETH Zurich)

2026-07-13 Reco Workshop B2T.pdf

talk_3.mp4

09:40 piE5 measurement plans

Speaker: Joshua LaBounty (University of Washington)

PiE5 Measurement Plans and Software - 2nd pioneer reconstruction workshop - 7-13-2026.pdf

PiE5 Measurement Plans and Software - 2nd pioneer reconstruction workshop - 7-13-2026.pptx

talk_4.mp4

10:10 Low-level reconstruction / raw data processing

Speaker: Patrick Schwendimann (ETHZ)

RecoWork_BeamtimeSoftware.pdf

talk_5.mp4

10:30 → 10:50 Coffee break

10:50 → 11:30 Day 1: Software

Conveners: Patrick Schwendimann (ETHZ), Quentin Buat (University of Washington)

10:50 PIONEER simulation and reconstruction framework 3.0

Speaker: Patrick Schwendimann (ETHZ)

RecoWork_FrameworkStatus.pdf

talk_6.mp4

11:10 LXe Calo reconstruction overview

We made significant progress on the LXe calorimeter reconstruction and are integrating the LXe reconstruction methods into the develop branch (called V3 before). This presentation gives an overview of the LXe calorimeter reconstruction and how to run the LXe option.

Speaker: Kensuke Yamamoto (The University of Tokyo)

talk_7.mp4

yamamoto_pioneerreco_260713.pdf

11:30 → 13:00 Lunch break

13:00 → 14:25 Day 1: Baseline Pipeline

Conveners: Patrick Schwendimann (ETHZ), Quentin Buat (University of Washington)

13:00 Status of the simulation and detector response

Speaker: Bradley Taylor (University of Washington - CENPA)

Current Status of the PIONEER Simulation and Detector Response.pdf

Current Status of the PIONEER Simulation and Detector Response.pptx

talk_8.mp4

13:20 Status of the Rule-based reconstruction

Speaker: Sean Foster (Amherst College)

Rule_based_reconstruction_workshop_2026.pdf

talk_9.mp4

13:50 ATAR8 simulations

Speaker: Jessie Yang (University of Washington)

ATAR8 Simulations.pdf

talk_10.mp4

14:10 genFit

Speaker: Adam Molnar (SCIPP (Santa Cruz Institute for Particle Physics))

July13_2026_recoworkshop.pdf

July13_2026_recoworkshop.pptx

talk_11.mp4

14:30 → 15:00 Coffee break

15:00 → 16:40 Day 1: AI

Conveners: Patrick Schwendimann (ETHZ), Quentin Buat (University of Washington)

15:00 Pioneer Unified Reconstruction with Interactive Transformer topologY (PURITY)

Speaker: Omar Beesley (University of Washington)

Status of the viability campaign using an AI reconstruction-1.pdf

talk_12.mp4

15:30 AI Infrastructure

Speaker: John Carlton (University of Kentucky)

main.pdf

talk_13.mp4

15:50 ML approach to LXe event reconstruction

We present a graph neural network-based approach to calorimeter shower reconstruction in liquid xenon, under development for the PIONEER experiment's LXe calorimeter option. The method employs a GravNet backbone operating on a graph of active sensors as nodes, with node features encoding spatial position, sensor type, and a compact temporal representation of photon arrival times via a learned basis decomposition across the characteristic LXe emission timescales: Cherenkov, prompt singlet, and triplet scintillation light. This temporal encoding is motivated by the need to reduce per-event input dimensionality while preserving the physically discriminating timing structure relevant to pile-up rejection and particle identification. The Object Condensation framework is adopted to handle variable-multiplicity shower reconstruction with per-cluster energy, position, and timing estimates. We present the motivation and architecture design, and preliminary results towards improved energy resolution, position reconstruction, and separation of overlapping showers in the high-rate pion decay environment with the LXe calorimeter option.

Speaker: David Gallacher (McGill Univeristy)

Pioneer_Reco_workshop_LXeML.pptx

talk_14.mp4

16:40 → 17:30 Small group discussions

Tuesday 14 July

09:00 → 10:00 Coding: Early risers

10:00 → 11:00 hackathon morning huddle

Convener: Quentin Buat (University of Washington)

11:00 → 12:30 Coding

13:30 → 17:30 Coding

Wednesday 15 July

09:00 → 10:00 Coding: early risers

10:00 → 11:00 hackathon morning huddle

11:00 → 12:30 Coding

13:30 → 17:00 Coding

18:00 → 20:00 workshop dinner

Thursday 16 July

09:00 → 10:00 Coding: early risers

10:00 → 11:00 hackathon morning huddle

11:00 → 12:30 Coding

14:00 → 17:30 Coding

Friday 17 July

08:30 → 09:50 Final Presentations

Convener: Quentin Buat (University of Washington)

08:30 Final Presentation - Kensuke

Speaker: Kensuke Yamamoto (The University of Tokyo)

yamamoto_pioneerreco_260717.pdf

08:40 Final Presentation - Kolja

Speaker: Kolja Frahm (ETH Zurich)

2026-07-17 Reconstruction Workshop update.pdf

08:50 Final Presentation - Josh

Speaker: Joshua LaBounty (University of Washington)

pioneer workshop recap - 7-17-2026.pdf

pioneer workshop recap - 7-17-2026.pptx

09:00 Final Presentation - Timon

Speaker: Timon Frank (ETH Zurich)

RecoWorkshop2026_TF.pdf

09:10 Final Presentation - Ari

Speaker: Ari Callahan (University of Washington)

PIM1 Degrader Design.pdf

09:20 Final Presentation - Bradley

Speaker: Bradley Taylor (University of Washington - CENPA)

Workshop Update.pdf

Workshop Update.pptx

09:30 Final Presentation - Meghan

Speaker: Meghan Naar

RecoWorkshopUpdate_MN.pdf

09:40 Final Presentation - Wren

Speaker: Wren Osar (Cornell University)

workshop summary.pdf

09:50 → 10:20 Coffee break

10:20 → 12:25 Final Presentations

10:25 Final Presentation - Omar

Speaker: Omar Beesley (University of Washington)

accidental_close_38582_2d.gif

10:35 Final Presentation - Rory

Speaker: Rory O'Dwyer (University of Washington)

UWAnalysisWorkingMeeting.pdf

10:45 Final Presentation - Tyler

Speaker: Tyler Barrett (Cornell University)

RecoWorkshopEnd2026.pdf

10:55 Final Presentation - Jack

Speaker: John Carlton (University of Kentucky)

Simulation Progress Report 07_17_2026.pdf

11:05 Final Presentation - Sean

Speaker: Sean Foster (Amherst College)

End_of_the_week_talk.pdf

11:15 Final Presentation - Adam

Speaker: Adam Molnar (SCIPP (Santa Cruz Institute for Particle Physics))

July17_2026_recoworkshop.pdf

July17_2026_recoworkshop.pdf

July17_2026_recoworkshop.pptx

11:25 Final Presentation - Jessie

Speaker: Jessie Yang (University of Washington)

ATAR8 Simulations (Update).pdf

11:35 Closing Remarks

Speaker: Quentin Buat (University of Washington)

closing_remarks.pdf