2015/10/31 by James Barnard, Peter Cox, Tony Gherghetta +1 · 9 citations
Computer Science · Physics and Astronomy · #Boson #Computational Physics and Python Applications #Hadron #Higgs boson #Homogeneous space #Large Hadron Collider #Neutrino Physics Research #Particle physics theoretical and experimental studies #Scalar (mathematics) #Spontaneous symmetry breaking #Symmetry breaking #hep-ph
paper · pdf · doi:10.1007/jhep03(2016)003
published in Journal of High Energy Physics 2016(3) (Springer Nature) · 29 pages, 8 figures; v2: version published in JHEP
openalex publication_date 2016/03/01 · arxiv created 2016/03/02 · arxiv updated 2016/03/03 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
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 NambuGoldstone 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. In addition we present exclusion and discovery reaches of future hadron colliders as well as indirect limits that arise from modifications of the Higgs couplings.