Experimental Particle Physics and Applied Physics


Douglas Bryman
J. B. Warren Chair
Professor, Department of Physics and Astronomy
University of British Columbia
Office: Hennings 286 Phone 604 822 0584


TRIUMF, 4004 Wesbrook Mall
Vancouver, BC V6T 2A3
Phone/Voicemail: 604 222 7338
Fax 604 222 1074

My group’s research in particle physics is aimed at understanding the “generation puzzle” – the confounding existence of three versions of the fundamental quarks and leptons such as the electron, muon and tau lepton. Aspects under study include the universality of interactions, suppression of generation-changing neutral currents, precisely testing Standard Model hypotheses, and searching for new effects such as the existence of high mass scales, new particles, and new interactions. Orders of magnitude improvements in sensitivity have been achieved by studying extremely rare processes which provide tight constraints on the existence of new physics effects. Important reactions have been discovered in the course of this work. The PIENU experiment at TRIUMF measures the branching ratio of pion decays to electrons and to muons. This challenging experiment tests the hypothesis that the muon is merely a heavy electron with unprecidented precision. It is also extremenly sensitive to the existence of new particles and interactions hypothesized in many current theories. We are also participating in the NA62 experiment at CERN studying ultra-rare kaon decays, particularly K+ > pi+ nu nubar.


Instrumentation Development for Particle Physics and Applied Physics. Particle physics experiments which stretch the boundaries of current knowledge often require the development of new instruments which have subsequently found applications in other fields such as radiation imaging detectors. My research group has specialized in the development of state-of-the-art detectors including particle tracking detectors like drift chambers and time projection chambers, and high speed electronics like 500 MHz GaAs CCD digitizers. We are also exploring particle tracking techniques for imaging applications.

Research Opportunities for Graduate Students:

Rare Decay Experiments NA62 (CERN)& PIENU (TRIUMF)

Discovery and Measurement of K+π+ννBNL E787/E949 Press Coverage

Study of the decay K+ ---> pi+ nu anti-nu in the momentum region 140 < P(pi) < 199-MeV/c. E949 Collaboration (A.V. Artamonov et al.). Phys.Rev.D79:092004,2009;

Physical Review Letters (Jan. 28, 2002)

Physical Review Letters Jan. 2002

Essay: New Light Shed on Dark PhotonsPhysics 7 (2014)

Rare Decay Group

Experiments Information


Applied Research:

Other Local Pages:

Applied Electromagnetic Theory(2011) 
Electricity and Magnetism (2014) 
Particle Detectors (2013)