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

Abstract

The t t h h 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 ( 5 b 1 ), multiple ( 5 ) b -jets and opposite-sign dilepton ( 5 b 2 ), same-sign dilepton ( SS 2 ), multiple leptons (multi- ), and ditau resonance ( τ τ ). The scenarios analyzed include: (1) the t t h h production in Standard Model; (2) the t t h h production mediated by anomalous cubic Higgs self-coupling and t t h h contact interaction; (3) heavy Higgs ( H ) production with t t H t t h h ; and (4) pair production of fermionic top partners ( T ) with T T t t h h . 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 5 b 1 and SS 2 analyses define the two most promising channels. For the nonresonant t t h h production, a combination of these exclusive analyses allows for its measurement in the SM with a statistical significance ~ 0.9 σ (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 t t h h 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 tan β (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 t h ) = 25 % and 50%, respectively.

Authors:
; ; ORCiD logo
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (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. https://doi.org/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}
}

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https://doi.org/10.1103/PhysRevD.101.055043

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