The Dilaton Potential and Lattice Data

Particle Physics Theory seminar

The Dilaton Potential and Lattice Data

  • Event time: 2:00pm
  • Event date: 8th January 2020
  • Speaker: James Ingoldby (ICTP - Trieste)
  • Location: Higgs Centre Seminar Room, Room 4305,

Event details

Lattice studies of a certain class of confining gauge
theories indicate the presence of an anomalously light scalar in the
spectrum of composites. Gauge theories in this class are chosen to have a
light fermion count lying just below the threshold value for entry into
the conformal window. In this talk, I will discuss recent work in which
this light scalar is interpreted as a dilaton and a simple EFT description
for it is studied and used to analyse recent lattice results. In this
work, we adopt a simple form for the dilaton potential in the EFT, which
interpolates among earlier proposals. It describes departures from
conformal symmetry, by the insertion of a single operator at leading order
in the EFT. Using the lattice measurements, we extract model parameter
values, including those that characterise the scalar potential. The
results suggest that the EFT provides a good fit to the data, and include
the possibility that the conformal deformation is clearly non-marginal.

About Particle Physics Theory seminars

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..

Find out more about Particle Physics Theory seminars.