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 language||English (US)|
|Title of host publication||Proceedings of the 51st Rencontres de Moriond - 2016 Electroweak Interactions and Unified Theories, EW 2016|
|Editors||Etienne Auge, Jacques Dumarchez, Jean Tron Thanh Van|
|Number of pages||8|
|State||Published - 2016|
|Event||51st Rencontres de Moriond on Electroweak Interactions and Unified Theories, EW 2016 - La Thuile, Italy|
Duration: Mar 12 2016 → Mar 19 2016
|Name||Proceedings of the 51st Rencontres de Moriond - 2016 Electroweak Interactions and Unified Theories, EW 2016|
|Conference||51st Rencontres de Moriond on Electroweak Interactions and Unified Theories, EW 2016|
|Period||3/12/16 → 3/19/16|
Bibliographical noteFunding Information:
T.G. gratefully acknowledges James Barnard, Peter Cox, Tirtha Sankar Ray and Andrew Spray for collaboration on the work presented here, and is supported by the Department of Energy grant DE-SC0011842 at the University of Minnesota.
© Published by ARISF, 2016.