PIRSA:16020052

The Unnatural (or Split) Composite Higgs

Gherghetta, T. (2016). The Unnatural (or Split) Composite Higgs. Perimeter Institute. https://pirsa.org/16020052

Gherghetta, Tony. The Unnatural (or Split) Composite Higgs. Perimeter Institute, Feb. 02, 2016, https://pirsa.org/16020052 

          @misc{ pirsa_PIRSA:16020052,
            doi = {10.48660/16020052},
            url = {https://pirsa.org/16020052},
            author = {Gherghetta, Tony},
            keywords = {Particle Physics},
            language = {en},
            title = {The Unnatural (or Split) Composite Higgs},
            publisher = {Perimeter Institute},
            year = {2016},
            month = {feb},
            note = {PIRSA:16020052 see, \url{https://pirsa.org}}
          }

Tony Gherghetta

University of Melbourne

Talk number
PIRSA:16020052
Collection
Talk Type
Subject
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.