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 : = 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 [tau]-leptons with the ATLAS detector

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

Object Details

• Alternative 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 [tau]-leptons with the ATLAS detector
• Location: Deutsche Nationalbibliothek Frankfurt am Main
• Extent: Online-Ressource
• Language: Englisch
• Notes: Journal of high energy physics. - 2023, 10 (2023) , 9, ISSN: 1029-8479

Contributors, Places and Time

• Event: Veröffentlichung
• (where): Freiburg
• (who): Universität
• (when): 2024
• Creator: ATLAS Collaboration CERN, [Study Group] ; Argyropoulos, Spyridon ; Becherer, Fabian ; Böhler, Michael ; Burlayenko, Oleksandr ; Diehl, Leena ; Froch, Alexander ; Gurdasani, Simran Sunil ; Heidegger, Constantin ; Heidegger, Kim K. ; Herten, Gregor ; Jain, Prasham ; Jakobs, Karl ; Jenni, Peter ; Kalaitzidou, Ilia ; Karentzos, Efstathios ; Köneke, Karsten ; Küsters, Roman ; Kuprash, Oleg ; Landgraf, Ulrich ; Lang, Valerie ; Moskalets, Tetiana ; Öncel, Ömer Ogul ; Parzefall, Ulrich ; Plesanovs, Vladislavs ; Pretel, Jose ; Rafanoharana, Dimbiniaina ; Rodríguez Rodríguez, Arturo ; Rossini, Lorenzo ; Rottler, Benjamin ; Rúriková, Zuzana ; Sammel, Dirk ; Sauerburger, Frank ; Schleicher, Katharina E. ; Scholer, Patrick ; Schumacher, Markus ; Solovieva, Ksenia ; Sperlich, Dennis ; Weiser, Christian ; Winter, Benedict T. ; Zanzi, Daniele ; et al
• Contributor: Experimentelle Teilchenphysik

Further information

• DOI: 10.1007/jhep10(2023)009
• URN: urn:nbn:de:bsz:25-freidok-2543462
• Rights: Open Access; Der Zugriff auf das Objekt ist unbeschränkt möglich.
• Last update: 25.03.2025, 1:49 PM CET