#### Light scalars from compactified extra dimensions. Lattice results

- Event time: 2:00pm
- Event date: 23rd March 2011
- Speaker: Enrico Rinaldi (University of Edinburgh)
- Location: Lecture Theatre C, James Clerk Maxwell Building (JCMB) James Clerk Maxwell Building Peter Guthrie Tait Road Edinburgh EH9 3FD GB

### Event details

The idea of studying 5 dimensional (5D) gauge theories to get some insights into new physics is very attractive. When the extra dimension is compactified and small, the theory provide a way to naturally obtain a light scalar particle in 4 dimensions. However, higher dimensional gauge theories are perturbatively non-renormalizable and can be used only in the framework of Effective Field Theories. Therefore, physical observables in a 5D theory can depend explicitly on the regularization procedure and on the actual value of the cut-off; using a sensible gauge-invariant cut-off regularization allow one to extract non-perturbative information out of these theories. As a simple non--trivial model, we started studying a non-abelian SU(2) gauge theory on a 5 dimensional euclidean lattice. I will present numerical results for the phase diagram of the lattice model and for the mass of the scalar in particular region of the parameter's space.

The Particle Physics Theory seminar is a weekly series of talks reflecting the diverse interests of the group. Topics include analytic and numerical calculations based on the Standard Model of elementary particle physics, theories exploring new physics, as well as more formal developments in gauge theories and gravity..