Carleton University

Research Assistant

- Calibration of liquid-argon forward calorimeters for LHC ATLAS
- Higgs phenomenology
- Data analysis for Sudbury Neutrino Observatory

University of Toronto

Research and Teaching Assistant

Research in experimental high-energy particle physics with the LHC ATLAS collaboration, specializing in dark matter searches. Teaching assistant for undergraduate physics courses.

University of Toronto

The PGSA holds networking, social, and academic-oriented events for physics graduate students at the University of Toronto.

University of Toronto

Graduate students, post-docs, and faculty members provide undergraduate physics majors with academic, career, and life-skills guidance through the department's mentorship program.

Arthur B. McDonald Canadian Astroparticle Physics Research Institute

Assistant Professor

My primary research area is low-mass dark matter searches, as a member of the SuperCDMS direct-detection experiment at SNOLAB.

Perimeter Institute

PSIon

PSIon: member of Perimeter Scholars International. (Although I do also have a certain fondness for psi-mesons.) Research specialized in low-mass dark matter and Beyond the Standard Model gauge forces.

Stanford Linear Accelerator Center

Experimental Research Associate

Detector development, data acquisition, and data analysis for the Heavy Photon Search (HPS) experiment

Searching for Light Dark Matter with the SLAC Millicharge Experiment

Physical Review Letters

New sub-GeV gauge forces ("dark photons") that kinetically mix with the photon provide a promising scenario for MeV-GeV dark matter, and are the subject of a program of searches at fixed-target and collider facilities around the world. In such models, dark photons produced in collisions may decay invisibly into dark matter states, thereby evading current searches. We re-examine results of the SLAC mQ electron beam dump experiment designed to search for millicharged particles, and find that it was strongly sensitive to any secondary beam of dark matter produced by electron-nucleus collisions in the target. The constraints are competitive for dark photon masses in the ~1-30 MeV range, covering part of the parameter space that can reconcile the apparent (g-2)_{\mu} anomaly. Simple adjustments to the original SLAC search for millicharges may extend sensitivity to cover a sizable portion of the remaining (g-2)_{\mu} anomaly-motivated region. The mQ sensitivity is therefore complementary to on-going searches for visible decays of dark photons. Compared to existing direct detection searches, mQ sensitivity to electron-dark matter scattering cross sections is more than an order of magnitude better for a significant range of masses and couplings in simple models.

Searching for Light Dark Matter with the SLAC Millicharge Experiment

Physical Review Letters

New sub-GeV gauge forces ("dark photons") that kinetically mix with the photon provide a promising scenario for MeV-GeV dark matter, and are the subject of a program of searches at fixed-target and collider facilities around the world. In such models, dark photons produced in collisions may decay invisibly into dark matter states, thereby evading current searches. We re-examine results of the SLAC mQ electron beam dump experiment designed to search for millicharged particles, and find that it was strongly sensitive to any secondary beam of dark matter produced by electron-nucleus collisions in the target. The constraints are competitive for dark photon masses in the ~1-30 MeV range, covering part of the parameter space that can reconcile the apparent (g-2)_{\mu} anomaly. Simple adjustments to the original SLAC search for millicharges may extend sensitivity to cover a sizable portion of the remaining (g-2)_{\mu} anomaly-motivated region. The mQ sensitivity is therefore complementary to on-going searches for visible decays of dark photons. Compared to existing direct detection searches, mQ sensitivity to electron-dark matter scattering cross sections is more than an order of magnitude better for a significant range of masses and couplings in simple models.

A Search for Astrophysical Burst Signals at the Sudbury Neutrino Observatory

Astroparticle Physics

The Sudbury Neutrino Observatory (SNO) has confirmed the standard solar model and neutrino oscillations through the observation of neutrinos from the solar core. In this paper we present a search for neutrinos associated with sources other than the solar core, such as gamma-ray bursters and solar flares. We present a new method for looking for temporal coincidences between neutrino events and astrophysical bursts of widely varying intensity. No correlations were found between neutrinos detected in SNO and such astrophysical sources.

Searching for Light Dark Matter with the SLAC Millicharge Experiment

Physical Review Letters

New sub-GeV gauge forces ("dark photons") that kinetically mix with the photon provide a promising scenario for MeV-GeV dark matter, and are the subject of a program of searches at fixed-target and collider facilities around the world. In such models, dark photons produced in collisions may decay invisibly into dark matter states, thereby evading current searches. We re-examine results of the SLAC mQ electron beam dump experiment designed to search for millicharged particles, and find that it was strongly sensitive to any secondary beam of dark matter produced by electron-nucleus collisions in the target. The constraints are competitive for dark photon masses in the ~1-30 MeV range, covering part of the parameter space that can reconcile the apparent (g-2)_{\mu} anomaly. Simple adjustments to the original SLAC search for millicharges may extend sensitivity to cover a sizable portion of the remaining (g-2)_{\mu} anomaly-motivated region. The mQ sensitivity is therefore complementary to on-going searches for visible decays of dark photons. Compared to existing direct detection searches, mQ sensitivity to electron-dark matter scattering cross sections is more than an order of magnitude better for a significant range of masses and couplings in simple models.

A Search for Astrophysical Burst Signals at the Sudbury Neutrino Observatory

Astroparticle Physics

The Sudbury Neutrino Observatory (SNO) has confirmed the standard solar model and neutrino oscillations through the observation of neutrinos from the solar core. In this paper we present a search for neutrinos associated with sources other than the solar core, such as gamma-ray bursters and solar flares. We present a new method for looking for temporal coincidences between neutrino events and astrophysical bursts of widely varying intensity. No correlations were found between neutrinos detected in SNO and such astrophysical sources.

Search for long-lived neutral particles decaying into displaced lepton jets in proton--proton collisions at √s = 13 TeV with the ATLAS detector

38th International Conference on High Energy Physics

This note presents the results of a search for long-lived neutral particles decaying into collimated jets of light leptons and mesons, so-called "lepton-jets", using a sample of 3.4/fb of proton-proton collisions data at a centre-of-mass energy of √s=13TeV collected during 2015 with the ATLAS detector at the LHC.