Long-lived, colour-triplet scalars from unnaturalness

Barnard, James; Cox, Peter; Gherghetta, Tony; Spray, Andrew

doi:10.1007/JHEP03(2016)003

Long-lived, colour-triplet scalars from unnaturalness

Journal Article · Tue Mar 01 00:00:00 EST 2016 · Journal of High Energy Physics (Online)

DOI:https://doi.org/10.1007/JHEP03(2016)003· OSTI ID:1327010

Barnard, James ^[1]; Cox, Peter ^[2]; Gherghetta, Tony ^[3]; Spray, Andrew ^[4]

The University of Melbourne, Victoria (Australia); University of Minnesota
The University of Melbourne, Victoria (Australia)
Univ. of Minnesota, Minneapolis, MN (United States)
The University of Melbourne, Victoria (Australia); Institute for Basic Science (IBS), Daejeon (Korea)

We study that long-lived, colour-triplet scalars are a generic prediction of unnatural, or split, composite Higgs models where the spontaneous global-symmetry breaking scale f ≳ 10TeV 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 13TeV triplet scalar masses up to 1.4TeV can be discovered. For shorter lifetimes displaced-vertex searches provide a discovery reach of up to 1.8TeV. Also, we present exclusion and discovery reaches of future hadron colliders as well as indirect limits that arise from modi cations of the Higgs couplings.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Minnesota, Minneapolis, MN (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: SC0011842

OSTI ID:: 1327010

Alternate ID(s):: OSTI ID: 22598360

Journal Information:: Journal of High Energy Physics (Online), Journal Name: Journal of High Energy Physics (Online) Journal Issue: 3 Vol. 2016; ISSN 1029-8479

Publisher:: Springer BerlinCopyright Statement

Country of Publication:: United States

Language:: English

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