Events

Theory Seminar (High Energy/Cosmology)

<< Fall 2015 Spring 2016 Summer 2016 >>
Subscribe your calendar or receive email announcements of events

Events on Tuesday, February 16th, 2016

The Unnatural (or Split) Composite Higgs
Time: 3:30 pm - 4:30 pm
Place: 5280 Chamberlin Hall
Speaker: Tony Gherghetta, University of Minnesota
Abstract:
A simple way to trivially satisfy precision-electroweak and flavor constraints in composite Higgs models is to require a large global symmetry breaking scale, f > 10 TeV. This leads to a tuning of order 10^-4 to obtain the observed Higgs mass, but gives rise to a 'split' spectrum where the strong-sector resonances with masses greater than 10 TeV are separated from the pseudo Nambu-Goldstone bosons, which remain near the electroweak scale. To preserve gauge-coupling unification (due to a composite top quark), the symmetry breaking scale satisfies an upper bound f < 100-1000 TeV, which implies that the resonances are not arbitrarily heavy and may be accessible at future colliders. Furthermore, by identifying dark matter with a pseudo Nambu-Goldstone boson, the smallest coset space containing a stable, scalar singlet and an unbroken SU(5) symmetry is SU(7) / SU(6) x U(1). Interestingly, this coset space also contains a metastable color-triplet pseudo Nambu-Goldstone boson that can decay via a displaced vertex when produced at colliders, leading to a distinctive signal of unnaturalness.
Host: Yang Bai
Add this event to your calendar