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Search for a new heavy scalar particle decaying into a Higgs boson and a new scalar singlet in final states with one or two light leptons and a pair of τ-leptons with the ATLAS detector ATLAS Collaboration
Abstract
A search for a new heavy scalar particle X decaying into a Standard Model (SM) Higgs boson and a new singlet scalar particle S is presented. The search uses a protonproton (pp) collision data sample with an integrated luminosity of 140 fb−1 recorded at a centre-of-mass energy of √ s = 13 TeV with the ATLAS detector at the Large Hadron Collider. The most sensitive mass parameter space is explored in X mass ranging from 500 to 1500 GeV, with the corresponding S mass in the range 200–500 GeV. The search selects events with two hadronically decaying τ -lepton candidates from H → τ +τ − decays and one or two light leptons (ℓ = e, µ) from S → V V (V = W, Z) decays while the remaining V boson decays hadronically or to neutrinos. A multivariate discriminant based on event kinematics is used to separate the signal from the background. No excess is observed beyond the expected SM background and 95% confdence level upper limits between 72 fb and 542 fb are derived on the cross-section σ(pp → X → SH) assuming the same SM-Higgs boson-like decay branching ratios for the S → V V decay. Upper limits on the visible cross-sections σ(pp → X → SH → WW τ τ ) and σ(pp → X → SH → ZZτ τ ) are also set in the ranges 3–26 fb and 6–33 fb, respectively.
Item Metadata
Title |
Search for a new heavy scalar particle decaying into a Higgs boson and a new scalar singlet in final states with one or two light leptons and a pair of τ-leptons with the ATLAS detector
|
Creator | |
Publisher |
Springer Berlin Heidelberg
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Date Issued |
2023-10-03
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Description |
A search for a new heavy scalar particle X decaying into a Standard Model (SM)
Higgs boson and a new singlet scalar particle S is presented. The search uses a protonproton (pp) collision data sample with an integrated luminosity of 140 fb−1
recorded at
a centre-of-mass energy of √
s = 13 TeV with the ATLAS detector at the Large Hadron
Collider. The most sensitive mass parameter space is explored in X mass ranging from 500
to 1500 GeV, with the corresponding S mass in the range 200–500 GeV. The search selects
events with two hadronically decaying τ -lepton candidates from H → τ
+τ
− decays and
one or two light leptons (ℓ = e, µ) from S → V V (V = W, Z) decays while the remaining
V boson decays hadronically or to neutrinos. A multivariate discriminant based on event
kinematics is used to separate the signal from the background. No excess is observed beyond
the expected SM background and 95% confdence level upper limits between 72 fb and 542 fb
are derived on the cross-section σ(pp → X → SH) assuming the same SM-Higgs boson-like
decay branching ratios for the S → V V decay. Upper limits on the visible cross-sections
σ(pp → X → SH → WW τ τ ) and σ(pp → X → SH → ZZτ τ ) are also set in the ranges
3–26 fb and 6–33 fb, respectively.
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Subject | |
Genre | |
Type | |
Language |
eng
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Date Available |
2023-11-08
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Provider |
Vancouver : University of British Columbia Library
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Rights |
Attribution 4.0 International (CC BY 4.0)
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DOI |
10.14288/1.0437569
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URI | |
Affiliation | |
Citation |
Journal of High Energy Physics. 2023 Oct 03;2023(10):9
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Publisher DOI |
10.1007/JHEP10(2023)009
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Peer Review Status |
Reviewed
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Scholarly Level |
Faculty
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Copyright Holder |
The Author(s)
|
Rights URI | |
Aggregated Source Repository |
DSpace
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Item Media
Item Citations and Data
Rights
Attribution 4.0 International (CC BY 4.0)