Joonsuk Bae ALICE · ePIC
PhD candidate · Sungkyunkwan University

Primary analyzer of the first ALICE Run 3 inclusive charged-particle jet measurement in pp at √s = 13.6 TeV.

Among the most active analyzers in the ALICE jet working group. Doctoral work centers on the R-dependent cross-section ratio shown below — ALICE Preliminary, presented on behalf of ALICE at EPS-HEP 2025 as the PWG-JE merge talk. Paper proposal targeted August 2026.

● Postdoc-available January – March 2027
ALICE Preliminary: R-dependent charged-particle jet cross-section ratios in pp at √s = 13.6 TeV (ALI-PREL-634701)
ALI-PREL-634701  ·  σ(R=0.2) / σ(R) cross-section ratios vs. Monte Carlo predictions  ·  pp √s = 13.6 TeV, anti-kT, |ηjet| < 0.2  ·  thesis principal result
Modern parton-shower tunes converge with the data above ~40 GeV/c but diverge by up to 30% in the soft, large-R regime — a direct test of how non-perturbative emissions are modeled.
§1 Doctoral analysis · ALICE Run 3

Built end-to-end.

The thesis is the first ALICE Run 3 inclusive charged-particle jet measurement: pp at √s = 13.6 TeV, anti-kT with R = 0.2–0.6, |ηjet| < 0.2. I built the full analysis chain — detector-level QA on continuous-readout data, Run 3-specific cross-section normalization based on the TVX visible cross section, response-matrix construction, Bayesian and SVD unfolding, and a complete systematic-uncertainty program covering tracking-related effects and unfolding stability.

The R-dependent ratios shown above are the principal result. PWG-JE preliminary; presented on behalf of ALICE at EPS-HEP 2025 as the PWG-JE merge talk. Paper proposal targeted August 2026.

§2 Next directions

A coherent program of bias-robust observables
across O+O and Pb+Pb.

Three pillars, year-staggered. Radial observables make selection bias directly testable; photon tagging provides a cleaner recoil probe; together they let us study medium modification and medium response in a controlled way — across the LHC heavy-ion programs and the RHIC small-system data.

Year 1
Jet shape ρ(r) and fragmentation function D(z) in 2025 O+O.
Radial observables that make selection bias directly testable; a natural bridge from the thesis pp baseline into small-system QGP searches.
Years 1 – 2
γ-tagged jet-shape measurements in small systems.
The colorless photon trigger as a cleaner probe of medium-induced jet modification; available where full electromagnetic calorimetry is.
Years 2 – 3
γ+jet Δφ acoplanarity and γ+jet correlations in Pb+Pb.
Medium-induced kT broadening and the diffusion-wake search (arXiv:2408.08599) toward a measurement.
§3 Detector R&D · ePIC Barrel Imaging Calorimeter

Lead offline analyst,
CERN PS T10 (2025.07).

Pb/scintillating-fiber prototype, two 2025 beam-test campaigns. CERN PS T10 (July 2025) — lead offline analyst, paper in preparation 2026; KEK AF–AR (March 2025) — on-site DAQ shifter, equalization, prompt analysis, co-author. Co-author on the first beam-test paper, submitted to Nucl. Instrum. Meth. A (NIMA-D-26-00482).

On the simulation side I contribute energy- and η-dependent sampling-fraction studies in JANA2 / EIC-recon and Geant4 prototype modeling for the Korea-BIC software effort.

§4 Software & infrastructure · O²Physics

Made shared infrastructure.

I authored the PWG-JE cross-section normalization framework used by the SKKU Run 3 charged-jet analyses (pp 13.6 TeV and O+O), and merged a central-framework fix to the track momentum-resolution smearing methodology shared across analyses.

37 pull requests to ALICE O²Physics (18 merged) since 2023, covering jet finding, response matrices, systematic-uncertainty pipelines, hadronic-rate fixes, and central reconstruction.

§5 Mentoring & community

Brought others along.

Co-mentor of two MSc co-analyzers on the ALICE Run 3 O+O charged-jet measurement (SKKU, 2025–present); co-author with W. Ham on the corresponding PWG-JE Analysis Note. Co-organizer and instructor of the KoALICE O²Physics Tutorial (SKKU, January 2024) — a two-day Run 3 analysis-framework tutorial for ~22 Korean ALICE participants. Regular speaker at ALICE PWG-JE meetings since 2023.

§6 Trajectory · 2022 → 2027

Path to thesis.

2022.10
Joined ALICE
2024.01
KoALICE O²Physics Tutorial
(co-organizer, instructor)
2025.07
EPS-HEP 2025
PWG-JE merge talk
2026.08
Paper proposal
2026.11 – 12
PhD defense
2027.02
Postdoc start
Reach me

HP2026 in Nashville next week.

Letters from Prof. Beomkyu Kim (SKKU, advisor) and Prof. Sanghoon Lim (Yonsei, ePIC BIC supervisor) on request. For postdoc inquiries — jbae@cern.ch.

jbae@cern.ch CV (medium, 3 pp) ↗ CV (long, 5 pp) ↗ INSPIRE-HEP ↗ ORCID ↗ GitHub ↗