Theoretical Particle Physics

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QCD, Dilaton and Infrared Fixed Points

Speaker: Prof. Roman Zwicky (Edinburgh U.)
Date/Time: Wednesday 8 November 2023, 14:15
Room: Theresienstr. 37, A318


I will review the standard conformal window picture and explore the
possibility that the chirally broken phase (QCD) is amenable to an
(non-perturbative) infrared fixed point interpretation. I will show
that these assumptions lead to a consistent picture and comment on N=1
supersymmetric gauge theories. In the second part, I will further
speculate on the presence of a dilaton, and outline some of its
attractive features:

  1. compatibility of conformality with hadron masses,
  2. a solution to the Goldstone improvement problem,
  3. investigate the dilaton candidate of QCD, the sigma/f0(500) meson.

At last, I will give an outlook of how the Higgs can be interpreted as a
dilaton in this context and what the open problems are.