I'm a professor in the theoretical particle physics group in the Physics Department at Carleton University, in Ottawa, Canada. The theory group works on a wide range of topics in high energy physics, with a focus on topics relevant to current or near-future particle physics experiments.

I'm particularly interested in the question of the origin of mass. This topic is exciting because of the very wide array of possible solutions to the problem of mass: everything from new forces of nature, to supersymmetry, to extra dimensions of space. These solutions could give us a window not only on the origin of mass, but also on the dark matter in the universe and maybe the origin of ordinary matter as well. Data from the Large Hadron Collider, now running at CERN in Geneva, Switzerland, should allow many of these questions to be answered.

My research involves studying the details of theoretical models in order to work out their predictions for what can be seen and measured in experiments, thereby allowing the models to be tested. Recently my work has focused on experimental signatures of strongly-coupled theories for the origin of mass. I also study extended Higgs sectors: in particular, the properties of charged Higgs bosons, strategies for distinguishing different models, and the possible connections of these models to dark matter.

Student positions:

• The Theory Group is currently looking for new grad students! More information is on the Theory Group webpage.
• I usually take an undergrad summer student each year through the NSERC USRA program. Here's how to apply. (Applications are due in January for the following summer.)

Recent publications and preprints (students in bold type):

• K. Hally, H. E. Logan and T. Pilkington, "Constraints on large scalar multiplets from perturbative unitarity," arXiv:1202.5073 [hep-ph].
• B. Coleppa, T. Gregoire and H. E. Logan, "Dilaton constraints and LHC prospects," Phys. Rev. D 85, 055001 (2012) [arXiv:1111.3276 [hep-ph]].
• R. S. Chivukula, E. H. Simmons, B. Coleppa, H. E. Logan and A. Martin, "LHC limits on the top-Higgs in models with strong top-quark dynamics," Phys. Rev. D 84, 095022 (2011) [arXiv:1108.4000 [hep-ph]].
• H. E. Logan and J. Z. Salvail, "Model-independent Higgs coupling measurements at the LHC using the H --> ZZ --> 4l lineshape," Phys. Rev. D 84, 073001 (2011) [arXiv:1107.4342 [hep-ph]].
• G. Cree and H. E. Logan, "Yukawa alignment from natural flavor conservation," Phys. Rev. D 84, 055021 (2011) [arXiv:1106.4039 [hep-ph]].
• R. S. Chivukula, E. H. Simmons, B. Coleppa, H. E. Logan and A. Martin, "Top-Higgs and top-pion phenomenology in the Top Triangle Moose model," Phys. Rev. D 83, 055013 (2011) [arXiv:1101.6023 [hep-ph]].