EducationPh.D., Princeton University
My research has two thrusts - accelerator-based experiments involving particles containing heavy quarks, and an astro-particle experiment aimed at uncovering possible point sources for ultra-high-energy neutrinos. The accelerator program is based at CDF at Fermilab and CMS at CERN. It explores the nature of the strong force, via the production properties of heavy-quark states compared to the more copious light-quark states, as well as looking for evidence of new physics by precision measurements of weak decays of hadrons containing b-mesons. Work at CDF over the last decade has highlighted some unanticipated features of data, and our group is planning to continue these studies in CMS. Of course the opening of a new energy frontier at the Large Hadron Collider is an exciting time for particle physics. Our program includes active participation in searches for new phenomena, such as supersymmetry, with the expectation that we will find evidence not only for a new class of particles but also discover the source of the mysterious dark matter that permeates the universe.
The cosmological aspects of the supersymmetry searches are related to our new astro-particle experiment to probe energy release in Active Galactic Nuclei and other cosmic accelerators. High Energy Neutrino astronomy is a major new tool in our generation. We are developing a new experimental technique that complements the big experiments now underway at the South Pole and in
the Mediterranean. We can tell the difference between individual point sources and a diffuse flux from a large region in space - a unique feature of our approach, and a crucial step forward for the field.
- S. Chatrchyan et al., Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC, Physics Letters B 716, 30 (2012)
- T. Aaltonen et al., Measurement of the Bc- meson lifetime in the decay Bc-→J/ψπ-, Physical Review D 87, 011101 (2013)
- T. Aaltonen et al., Measurements of the Angular Distributions of Muons from Υ Decays in pp̅ Collisions at √s̅=1.96 TeV, Physical Review Letters 108, 151802 (2012)
- T. Aaltonen et al., Observation of the Ξb0 Baryon, Physical Review Letters 107, 102001 (2011)
- V. Khachatryan et al., Prompt and non-prompt J/ψ production in pp̅ collisions at √s̅ = 7 TeV, The European Physical Journal C 71, 1575 (2011)
- T. Aaltonen et al., Precision Measurement of the X(3872) Mass in J/ψπ+π- Decays, Physical Review Letters 103, 152001 (2009)
- T. Aaltonen et al., Production of ψ(2S) mesons in pp̅ collisions at 1.96 TeV, Physical Review D 80, 031103 (2009)
- T. Aaltonen et al., Evidence for a Narrow Near-Threshold Structure in the J/ψϕ Mass Spectrum in B+→J/ψϕK+ Decays, Physical Review Letters 102, 242002 (2009)
- M. Mattson et al., First Observation of the Doubly Charmed Baryon Ξcc+, Physical Review Letters 89, 112001 (2002)