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Title: Probing a scalar singlet-catalyzed electroweak phase transition with resonant di-Higgs boson production in the 4 b channel

Abstract

We investigate the prospective reach of the 14 TeV HL-LHC for resonant production of a heavy Higgs boson that decays to two SM-like Higgs bosons in the 4b final state in the scalar singlet extended Standard Model. We focus on the reach for choices of parameters yielding a strong first order electroweak phase transition. The event selection follows the 4b analysis by the ATLAS Collaboration, enhanced with the use of a boosted decision tree method to optimize the discrimination between signal and background events. The output of the multivariate discriminant is used directly in the statistical analysis. The prospective reach of the 4b channel is compatible with previous projections for the bbγγ and 4τ channels for heavy Higgs boson mass m2 below 500 GeV and superior to these channels for m2 > 500 GeV. With 3 ab–1 of integrated luminosity, it is possible to discover the heavy Higgs boson in the 4b channel for m2 < 500 GeV in regions of parameter space yielding a strong first order electroweak phase transition and satisfying all other phenomenological constraints.

Authors:
ORCiD logo; ; ORCiD logo
Publication Date:
Research Org.:
Univ. of Massachusetts, Amherst, MA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP)
OSTI Identifier:
1572131
Alternate Identifier(s):
OSTI ID: 1595340
Grant/Contract Number:  
SC0011095; SC0010004; 11875003
Resource Type:
Published Article
Journal Name:
Physical Review D
Additional Journal Information:
Journal Name: Physical Review D Journal Volume: 100 Journal Issue: 7; 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; Baryogenesis & Ieptogenesis; Branching fraction; Extensions of Higgs sector; Hadron colliders; Machine learning

Citation Formats

Li, Hao-Lin, Ramsey-Musolf, Michael J., and Willocq, Stéphane. Probing a scalar singlet-catalyzed electroweak phase transition with resonant di-Higgs boson production in the 4 b channel. United States: N. p., 2019. Web. doi:10.1103/PhysRevD.100.075035.
Li, Hao-Lin, Ramsey-Musolf, Michael J., & Willocq, Stéphane. Probing a scalar singlet-catalyzed electroweak phase transition with resonant di-Higgs boson production in the 4 b channel. United States. doi:10.1103/PhysRevD.100.075035.
Li, Hao-Lin, Ramsey-Musolf, Michael J., and Willocq, Stéphane. Mon . "Probing a scalar singlet-catalyzed electroweak phase transition with resonant di-Higgs boson production in the 4 b channel". United States. doi:10.1103/PhysRevD.100.075035.
@article{osti_1572131,
title = {Probing a scalar singlet-catalyzed electroweak phase transition with resonant di-Higgs boson production in the 4 b channel},
author = {Li, Hao-Lin and Ramsey-Musolf, Michael J. and Willocq, Stéphane},
abstractNote = {We investigate the prospective reach of the 14 TeV HL-LHC for resonant production of a heavy Higgs boson that decays to two SM-like Higgs bosons in the 4b final state in the scalar singlet extended Standard Model. We focus on the reach for choices of parameters yielding a strong first order electroweak phase transition. The event selection follows the 4b analysis by the ATLAS Collaboration, enhanced with the use of a boosted decision tree method to optimize the discrimination between signal and background events. The output of the multivariate discriminant is used directly in the statistical analysis. The prospective reach of the 4b channel is compatible with previous projections for the bbγγ and 4τ channels for heavy Higgs boson mass m2 below 500 GeV and superior to these channels for m2 > 500 GeV. With 3 ab–1 of integrated luminosity, it is possible to discover the heavy Higgs boson in the 4b channel for m2 < 500 GeV in regions of parameter space yielding a strong first order electroweak phase transition and satisfying all other phenomenological constraints.},
doi = {10.1103/PhysRevD.100.075035},
journal = {Physical Review D},
number = 7,
volume = 100,
place = {United States},
year = {2019},
month = {10}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1103/PhysRevD.100.075035

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Cited by: 4 works
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