Journal
EUROPEAN PHYSICAL JOURNAL C
Volume 79, Issue 6, Pages -Publisher
SPRINGER
DOI: 10.1140/epjc/s10052-019-6955-5
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Funding
- Mainz Institute of Theoretical Physics (MITP)
- European Research Council under the European Unions Horizon 2020 program, ERC Grant [648680]
- Programa Atraccion de Talento de la Comunidad de Madrid [2017-T1/TIC-5202]
- Spanish MINECO's Centro de Excelencia Severo Ochoa Programme [SEV-2016-0597]
- STFC [ST/P001246/1] Funding Source: UKRI
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We analyse the sensitivity of the proposed compact linear collider (CLIC) to the existence of beyond the standard model (SM) Higgs bosons through their decays into pairs of massive gauge bosons H -> VV and SM-like Higgses H -> hh, considering CLIC centre of mass energies root s = 1.4 TeV and 3 TeV. We find that resonant di-Higgs searches at CLIC would allow for up to two orders of magnitude improvement w. r. t. the sensitivity achievable by HL-LHC in the mass range mH is an element of[250 GeV, 1TeV]. Focusing then on a real singlet extension of the SM, we explore the prospects of heavy Higgs searches at CLIC for probing the regions of parameter space yielding a strongly first order electroweak phase transition that could generate the observed matter-antimatter asymmetry of the Universe. Our study illustrates the complementarity between CLIC and other possible future colliders like FCC-ee in probing singlet extensions of the SM, and shows that high-energy e(+)e(-) colliders provide a powerful means to unravel the nature of electroweak symmetry breaking in the early Universe.
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