Jul 3 – 8, 2016
The University of Melbourne
Australia/Melbourne timezone

Unnatural Composite Higgs at the LHC

Jul 7, 2016, 4:30 PM
Yasuko Hiraoka Myer Room

Yasuko Hiraoka Myer Room

Talk Non-SUSY and Exotics Higgs Physics


Peter Cox (The University of Melbourne)


Long-lived, colour-triplet scalars are a generic prediction of unnatural, or split, composite Higgs models where the spontaneous global-symmetry breaking scale $f≳10$ TeV and an unbroken SU(5) symmetry is preserved. Since the triplet scalars are pseudo Nambu-Goldstone bosons they are split from the much heavier composite-sector resonances and are the lightest exotic, coloured states. This makes them ideal to search for at colliders. Due to discrete symmetries the triplet scalar decays via a dimension-six term and given the large suppression scale $f$ is often metastable. We show that existing searches for collider-stable R-hadrons from Run-I at the LHC forbid a triplet scalar mass below 845 GeV, whereas with 300 fb$^{−1}$ at 13 TeV triplet scalar masses up to 1.4 TeV can be discovered. For shorter lifetimes displaced-vertex searches provide a discovery reach of up to 1.8 TeV. We also present exclusion and discovery reaches of future hadron colliders.

Primary authors

Dr Andrew Spray (Institute for Basic Science) James Barnard (University of Melbourne) Peter Cox (The University of Melbourne) Tony Gherghetta (University of Minnesota)

Presentation materials