Long-lived colour triplet scalars from a split composite higgs model

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Long-lived, colour-triplet scalars are a 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. Due to discrete symmetries and the large suppression scale f, the triplet scalar is often metastable. We show that existing searches for collider-stable R-hadrons from Run-I at the LHC forbid triplet scalars below 845 GeV. In the future with 300 fb−1 at 13 TeV, triplet scalar masses up to 1.4 TeV can be discovered, whereas for shorter lifetimes displaced-vertex searches provide a discovery reach of up to 1.8 TeV. Just like the role of long-lived gluinos in supersymmetry, long-lived color triplets will therefore provide a sign of unnaturalness in composite Higgs models.

Original languageEnglish (US)
Title of host publicationProceedings of the 51st Rencontres de Moriond - 2016 Electroweak Interactions and Unified Theories, EW 2016
EditorsEtienne Auge, Jacques Dumarchez, Jean Tron Thanh Van
PublisherARISF
Pages299-306
Number of pages8
ISBN (Electronic)9782954640099
StatePublished - 2016
Event51st Rencontres de Moriond on Electroweak Interactions and Unified Theories, EW 2016 - La Thuile, Italy
Duration: Mar 12 2016Mar 19 2016

Publication series

NameProceedings of the 51st Rencontres de Moriond - 2016 Electroweak Interactions and Unified Theories, EW 2016

Conference

Conference51st Rencontres de Moriond on Electroweak Interactions and Unified Theories, EW 2016
CountryItaly
CityLa Thuile
Period3/12/163/19/16

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