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Simulations of Beyond the Standard Model theories

Project BSMsim
Research Area Plasma & Particle Physics
Principal Investigator(s) Kari Rummukainen
  • University of Helsinki, Department of Physics, Finland
  • University of Jyväskylä, Finland


The Standard Model of particle physics has been extremely successful in describing the all results from particle physics experiments. However, there are tantalising hints for physics beyond the Standard Model from astrophysical observations and also from theoretical analysis. Thus, it is possible that LHC will find signs of this ’new physics’. Technicolor and other strongly interacting models are among the most popular alternatives for the new physics. However, it will be very important to know the detailed physical properties of the theory in order to be able to compare the predictions of the theory with the experiments. These models rely on so-called strong coupling phenomena, making their study with analytical methods difficult and often impossible. Only large-scale numerical simulations can yield reliable quantitative results; however, so far only initial studies have been made, and most of the relevant questions remain open.
The simulation set-up resembles the well-studied lattice QCD, but with different gauge fields and fermions in different representations. We have developed a very flexible simulation program suitable for studying this class of problems. It can simulate any gauge group and fermions with varying representations. In this project we aim to study the physical particle spectrum and the evolution of the coupling constant as a function of the energy in a selected set of candidate theories. The theories we study are SU(2) and SU(3) gauge field theories with adjoint or sextet representation quarks. The studies are done with non-perturbatively O(a) improved lattice theory, which will be implemented as the first stage of the project.

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