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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
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).ORCID iD: 0000-0002-9766-2670
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).ORCID iD: 0000-0001-7489-9184
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).ORCID iD: 0000-0002-3380-8167
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Number of Authors: 29292023 (English)In: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, Vol. 2023, no 10, article id 9Article in journal (Refereed) Published
Abstract [en]

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 proton-proton (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 SVV (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% confidence level upper limits between 72 fb and 542 fb are derived on the cross-section σ(ppXSH) assuming the same SM-Higgs boson-like decay branching ratios for the SVV decay. Upper limits on the visible cross-sections σ(ppXSHWWττ) and σ(ppXSHZZττ) are also set in the ranges 3–26 fb and 6–33 fb, respectively.

Place, publisher, year, edition, pages
2023. Vol. 2023, no 10, article id 9
Keywords [en]
Hadron-Hadron Scattering
National Category
Subatomic Physics
Identifiers
URN: urn:nbn:se:su:diva-224592DOI: 10.1007/JHEP10(2023)009ISI: 001090914900001OAI: oai:DiVA.org:su-224592DiVA, id: diva2:1822358
Available from: 2023-12-22 Created: 2023-12-22 Last updated: 2023-12-22Bibliographically approved

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Andrean, Stefio Y.Backman, FilipBarranco Navarro, LauraBohm, ChristianClément, ChristopheDunne, KatherineHellman, StenIngebretsen Carlson, TomKim, DongwonLee, SuhyunLou, XuanhongMilstead, David A.Pasuwan, PatrawanPereira Sanchez, LauraRichter, StefanRiefel, Ellen MariaSilverstein, Samuel B.Sjölin, JörgenStrandberg, SaraStrübig, AntoniaValdés Santurio, Eduardo

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Andrean, Stefio Y.Backman, FilipBarranco Navarro, LauraBohm, ChristianClément, ChristopheDunne, KatherineHellman, StenIngebretsen Carlson, TomKim, DongwonLee, SuhyunLou, XuanhongMilstead, David A.Pasuwan, PatrawanPereira Sanchez, LauraRichter, StefanRiefel, Ellen MariaSilverstein, Samuel B.Sjölin, JörgenStrandberg, SaraStrübig, AntoniaValdés Santurio, Eduardo
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Department of PhysicsThe Oskar Klein Centre for Cosmo Particle Physics (OKC)
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Subatomic Physics

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