A composite Higgs model built on a conformal fixed point

Particle Physics Theory seminar

A composite Higgs model built on a conformal fixed point

• Event time: 2:00pm
• Event date: 17th March 2016
• Speaker: Anna Hasenfratz (University of Colorado)
• Location: Higgs Centre Seminar Room, Room 4305,

Event details

A composite Higgs model  that is based on an infrared fixed point of a conformal system in the ultraviolet but chirally broken in the infrared can show many desirably features. The running coupling of such system walks" and the energy range of walking can be tuned, while the spectrum could include a light scalar characteristic of broken conformal symmetry. We realize such a model on the lattice by lifting the mass of some fermions while keeping the others massless or light.  Renormalisation group considerations predict that the spectrum of such a system shows hyperscaling. If the scale is set by the pseudoscalar decay constant $F_\pi \approx 250$ GeV the spectrum contains several resonances in the 2-3 TeV range, in addition to an isosinglet scalar that is around 750 GeV.