Anatomy of $tthh$ physics at the HL-LHC
Abstract
The 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 ( ) -jets and one lepton ( ), multiple ( ) -jets and opposite-sign dilepton ( ), same-sign dilepton ( ), multiple leptons (multi- ), and ditau resonance ( ). The scenarios analyzed include: (1) the production in Standard Model; (2) the production mediated by anomalous cubic Higgs self-coupling and contact interaction; (3) heavy Higgs ( ) production with ; and (4) pair production of fermionic top partners ( ) with . 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 and analyses define the two most promising channels. For the nonresonant production, a combination of these exclusive analyses allows for its measurement in the SM with a statistical significance (with ), 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 productions, the heavy Higgs boson in type II two-Higgs-doublet-model could be efficiently searched for between the mass thresholds and even beyond that, for relatively small (vacuum alignment), while the fermionic top partners in composite Higgs models could be probed up to and , for and 50%, respectively.
- Authors:
- Publication Date:
- Research Org.:
- Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), High Energy Physics (HEP); Research Grants Council (RGC)
- OSTI Identifier:
- 1607819
- Alternate Identifier(s):
- OSTI ID: 1638684
- Report Number(s):
- arXiv:1905.03772; FERMILAB-PUB-19-721-T
Journal ID: ISSN 2470-0010; PRVDAQ; 055043
- Grant/Contract Number:
- AC02-07CH11359; 16312716
- Resource Type:
- Published Article
- Journal Name:
- Physical Review D
- Additional Journal Information:
- Journal Name: Physical Review D Journal Volume: 101 Journal Issue: 5; Journal ID: ISSN 2470-0010
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
Citation Formats
Li, Lingfeng, Li, Ying-Ying, and Liu, Tao. Anatomy of $tthh$ physics at the HL-LHC. United States: N. p., 2020.
Web. doi:10.1103/PhysRevD.101.055043.
Li, Lingfeng, Li, Ying-Ying, & Liu, Tao. Anatomy of $tthh$ physics at the HL-LHC. United States. https://doi.org/10.1103/PhysRevD.101.055043
Li, Lingfeng, Li, Ying-Ying, and Liu, Tao. Tue .
"Anatomy of $tthh$ physics at the HL-LHC". United States. https://doi.org/10.1103/PhysRevD.101.055043.
@article{osti_1607819,
title = {Anatomy of $tthh$ physics at the HL-LHC},
author = {Li, Lingfeng and Li, Ying-Ying and Liu, Tao},
abstractNote = {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 (5b1ℓ), multiple (≥5) b-jets and opposite-sign dilepton (5b2ℓ), same-sign dilepton (SS2ℓ), multiple leptons (multi-ℓ), 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 ttH→tthh; and (4) pair production of fermionic top partners (T) with TT→tthh. 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 5b1ℓ and SS2ℓ 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 2mh<mH<2mt 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(T→th)=25% and 50%, respectively.},
doi = {10.1103/PhysRevD.101.055043},
journal = {Physical Review D},
number = 5,
volume = 101,
place = {United States},
year = {2020},
month = {3}
}
https://doi.org/10.1103/PhysRevD.101.055043
Web of Science
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