Andrew T. Mastbaum, Ph.D.

I am a Postdoctoral Fellow with the Enrico Fermi Institute at the University of Chicago, where I study the physics of neutrinos. My research includes both low-energy neutrino physics (SNO, SNO+, Theia) and short-baseline neutrino oscillations (SBND, MicroBooNE). I enjoy working on all aspects of experimental research from instrumentation to data analysis, and inspiring the next generation of particle physicists through teaching and mentoring.

mastbaum at | HepNames | arXiv | LinkedIn | GitHub | Twitter


  • NuTheories: Beyond the 3x3 Paradigm at Current and Near-Future Facilities, November 2018
    University of Pittsburgh, PACC
    Short-Baseline Oscillations: Current and Future Efforts, slides
  • 87th Compton Lecture Series, Spring 2018
    University of Chicago
    The Physics of Neutrinos: Progress and Puzzles
  • Fermilab-Chicago Psec Timing Planning Meeting, March 2018
    Chicago, IL
    Very Large Liquid Scintillator Detectors for NLDBD
  • EFI Particle Physics Seminar, November 2017
    Chicago, IL
    The Short-Baseline Neutrino Program
  • EFI Lunch Seminar, October 2017
    Chicago, IL
    Measuring hep Solar Neutrinos and the DSNB in SNO
  • APS April Meeting 2017
    Washington, DC
    Improved Constraints on the hep Solar Neutrino and Diffuse Supernova Neutrino Background Fluxes with SNO (Poster), abstract
  • Electronics and Instrumentation for Past and Future Discoveries, May 2015
    University of Pennsylvania, Philadelphia, PA (A symposium honoring Rick Van Berg)
    The SNO+ Search for Neutrinoless Double-Beta Decay
  • Conference on Science at the Sanford Underground Research Facility, May 2015
    South Dakota School of Mines and Technology, Rapid City, SD
    The SNO+ Experiment Search for Neutrinoless Double-Beta Decay, abstract, slides
  • APS April Meeting 2015
    Baltimore, MD
    Neutrinoless Double-Beta Decay Sensitivity in Water-based Liquid Scintillator Detectors, abstract
  • International Workshop on Next generation Nucleon Decay and Neutrino Detectors (NNN) 2014
    AstroParticule et Cosmologie (APC), Paris, France
    Event Reconstruction in LS and WbLS Detectors, slides
  • Advances in Neutrino Technology (ANT) 2013
    Lake Tahoe, CA
    Optical Detector Simulation and Analysis with RAT
  • APS April Meeting 2012
    Atlanta, GA
    Trigger System Upgrades for the SNO+ Experiment, abstract


  • Selected
  • S. Andringa et al. (SNO+ Collaboration), "Current Status and Future Prospects of the SNO+ Experiment," Advances in High Energy Physics 2016, 6194250 (2016). [paper, arXiv:1508.05759]
  • J. R. Alonso et al., "Advanced Scintillator Detector Concept (ASDC): A Concept Paper on the Physics Potential of Water-Based Liquid Scintillator," arXiv:1409.5864 (2014).
  • M. Akashi-Ronquest et al. (MiniCLEAN Collaboration), "Improving Photoelectron Counting and Particle Identification in Scintillation Detectors with Bayesian Techniques," Astroparticle Physics 65, 40-54 (2015). [paper, arXiv:1408.1914]
  • Additional
  • MicroBooNE Collaboration, "Rejecting cosmic background for exclusive neutrino interaction studies with Liquid Argon TPCs; a case study with the MicroBooNE detector," arxiv:1812.05679 (2018).
  • SNO+ Collaboration, "Search for invisible modes of nucleon decay in water with the SNO+ detector," arxiv:1812.05552 (2018).
  • SNO+ Collaboration, "Measurement of the 8B Solar Neutrino Flux in SNO+ with Very Low Backgrounds," Phys. Rev. D 99, 012012 (2019). [paper, arxiv:1812.03355]
  • SNO Collaboration, "Constraints on Neutrino Lifetime from the Sudbury Neutrino Observatory," arxiv:1812.01088 (2018).
  • MicroBooNE Collaboration, "First Measurement of numu Charged-Current pi0 Production on Argon with a LArTPC," arxiv:1811.02700 (2018).
  • SNO Collaboration, "Tests of Lorentz invariance at the Sudbury Neutrino Observatory," Phys. Rev. D 98, 112013 (2018). [paper, arxiv:1811.00166]
  • MicroBooNE Collaboration, "A Deep Neural Network for Pixel-Level Electromagnetic Particle Identification in the MicroBooNE Liquid Argon Time Projection Chamber," arxiv:1808.07269 (2018).
  • DUNE Collaboration, "The DUNE Far Detector Interim Design Report, Volume 3: Dual-Phase Module," arxiv:1807.10340 (2018).
  • DUNE Collaboration, "The DUNE Far Detector Interim Design Report, Volume 2: Single-Phase Module," arxiv:1807.10327 (2018).
  • DUNE Collaboration, "The DUNE Far Detector Interim Design Report, Volume 1: Physics, Technology and Strategies," arxiv:1807.10334 (2018).
  • MicroBooNE Collaboration, "Comparison of numu-Ar multiplicity distributions observed by MicroBooNE to GENIE model predictions," arxiv:1805.06887 (2018).
  • MicroBooNE Collaboration, "Ionization Electron Signal Processing in Single Phase LArTPCs II. Data/Simulation Comparison and Performance in MicroBooNE," JINST 13, P07007 (2018).
  • MicroBooNE Collaboration, "Ionization Electron Signal Processing in Single Phase LArTPCs I. Algorithm Description and Quantitative Evaluation with MicroBooNE Simulation," JINST 13, P07006 (2018).
  • A. Mastbaum, Constraining the hep Solar Neutrino and Diffuse Supernova Neutrino Background Fluxes with the Sudbury Neutrino Observatory, Ph.D. Dissertation (2016). [link]

The Short-Baseline Neutrino Program

The Short-Baseline Neutrino Program at Fermilab is searching for sterile neutrinos using three liquid argon time projection chambers (SBND, MicroBooNE, and ICARUS T600) in a high-intensity neutrino beam. The SBN experiments will definitively address experimental hints of non-interacting 'sterile' neutrino species by searching for transitions of muon neutrinos into electron neutrinos over short distance scales, and also make measurements of neutrino cross sections with unprecedented precision.

The Short-Baseline Neutrino Program

There exist a number of experimental "hints" towards a fourth kind of neutrino, beyond the three known flavors. This 'sterile' neutrino would not interact with other matter, but be detectable by its effect on neutrino oscillations; for example, one might observe neutrinos seeming to disappear, as they convert into the non-interacting sterile state. The existence of a new neutrino would have major implications for our understanding of particle physics, and an experiment is needed to definitively test this hypothesis.

The Short-Baseline Neutrino Program at Fermilab uses a set of three neutrino detectors (liquid argon time projection chambers, LArTPCs) positioned along an intense beam of neutrinos. By comparing the kinds of neutrinos arriving at each detector, it is possible to confirm or rule out the sterile neutrino hints with very high confidence. Experience and new techniques developed at the SBN experiments will also benefit the upcoming DUNE experiment.

Learn more about the SBN program at our homepage, or for all the details, see the SBN proposal. For more about the SBN group at UChicago and links to more resources, visit our webpage.


The SNO+ Experiment has a broad program in neutrino physics, and is primarily focused on a search for neutrinoless double-beta decay in Tellurium, using a kiloton-scale liquid scintillator detector. SNO+ is a successor to SNO (The Sudbury Neutrino Observatory), the experiment which resolved the "solar neutrino problem," demonstrating that neutrinos have mass and change flavor en route to Earth.

The SNO+ Experiment

The SNO+ Experiment is searching for neutrinoless double-beta decay (NLDBD) using a kilotonne-scale liquid scintillator detector located deep underground in Sudbury, Ontario, Canada. Additionally, SNO+ will search for nucleon decay (in an initial water-filled phase), low-energy solar neutrinos, reactor antineutrinos, geoneutrinos, supernova neutrinos, and exotic new physics scenarios. NLDBD is among the most exciting areas of nuclear and particle physics research. If this rare nuclear decay process is observed, it would imply that the neutrino is a Majorana fermion (i.e. its own antiparticle) and that lepton number is not conserved, as well as providing insight on the absolute mass of the neutrino.

Learn more about SNO+ at our homepage, our recent review article about the physics (doi, arxiv), or this cartoon-ey poster I made. You can also check out the UChicago SNO+ page or take a virtual tour of SNOLAB.

HEP Computing

Particle physics depends on computing systems in many ways: high-performance clusters for simulations and analysis of very large experimental datasets, and robust networks for data acquisition and processing. From engineering the core on-site computing infrastructure for SNO+ to managing institutional grid computing resources, to developing data acquisition and analysis software, I am passionate about building computing solutions that enable science.