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Title: Anatomy of $tthh$ physics at the HL-LHC

Journal Article · · Physical Review. D.
 [1]; ORCiD logo [2]; ORCiD logo [1]
  1. The Hong Kong Univ. of Science and Technology (Hong Kong)
  2. The Hong Kong Univ. of Science and Technology (Hong Kong); Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)

The tthh production at colliders contains rich information on the nature of the Higgs boson. In this article, we systematically studied its physics at the high-luminosity Large Hadron Collider (HL-LHC), using exclusive channels with multiple ( 5 ) b -jets and one lepton ( 5b1 ), multiple ( 5 ) b -jets and opposite-sign dilepton ( 5b2 ), same-sign dilepton ( SS 2 ), multiple leptons (multi- ), and ditau resonance ( ττ ). The scenarios analyzed include: (1) the tthh production in Standard Model; (2) the tthh production mediated by anomalous cubic Higgs self-coupling and tthh contact interaction; (3) heavy Higgs ( H ) production with ttHtthh ; and (4) pair production of fermionic top partners ( T ) with TTtthh . To address the complication of event topologies and the mess of combinatorial backgrounds, a tool of boosted-decision-tree was applied in the analyses. The 5b1 and SS 2 analyses define the two most promising channels. For the nonresonant tthh production, a combination of these exclusive analyses allows for its measurement in the SM with a statistical significance ~0.9σ (with S/B>1% ), and may partially break the sensitivity degeneracy with respect to a varying cubic Higgs self-coupling, a difficulty usually thought to exist in gluon fusion di-Higgs analysis at HL-LHC. These sensitivities were also projected to future hadron colliders at 27 TeV and 100 TeV. For the resonant tthh productions, the heavy Higgs boson in type II two-Higgs-doublet-model could be efficiently searched for between the mass thresholds 2 m h < m H <2 m t and even beyond that, for relatively small tanβ (vacuum alignment), while the fermionic top partners in composite Higgs models could be probed up to ~1.5 TeV and ~1.7 TeV , for Br(Tth)=25% and 50%, respectively.

Research Organization:
Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP); Research Grants Council (RGC)
Grant/Contract Number:
AC02-07CH11359; 16312716
OSTI ID:
1607819
Alternate ID(s):
OSTI ID: 1638684
Report Number(s):
arXiv:1905.03772; FERMILAB-PUB-19-721-T; oai:inspirehep.net:1734003; TRN: US2201809
Journal Information:
Physical Review. D., Vol. 101, Issue 5; ISSN 2470-0010
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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