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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 ofτ -leptons with the ATLAS detector
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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 ofτ -leptons with the ATLAS detector

Georges Aad, Braden Keim Abbott, Kira Abeling, Nils Julius Abicht, Haider Abidi, Asmaa Aboulhorma, Halina Abramowicz, Henso Abreu, Yiming Abulaiti, Bobby Samir Acharya, …
JHEP, 卷.10(10), 頁.9
03/10/2023
DOI: https://doi.org/10.1007/JHEP10(2023)009
Web of Science ID: WOS:001090914900001

摘要

High Energy Physics - Experiment Physics
A search for a new heavy scalar particleXdecaying into a Standard Model (SM) Higgs boson and a new singlet scalar particleSis presented. The search uses a proton-proton ( pp ) collision data sample with an integrated luminosity of 140 fb ⁻¹recorded at a centre-of-mass energy of√s̅ = 13TeV with the ATLAS detector at the Large Hadron Collider. The exploredXmasses range from 500 to 1500 GeV, with the correspondingSmass in the range 200-500 GeV. The search selects events with two hadronically decayingτ -lepton candidates fromH→ τ⁺τ⁻decays and one or two light leptons ( ℓ=e, μ ) fromS→ VV( V = W, Z ) decays. 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-sectionσ(pp→ X→ SH)assuming the same SM-Higgs boson-like decay branching ratios for theS→ VVdecay. Upper limits on the visible cross-sectionsσ(pp→ X→ SH → WWττ)andσ(pp→ X→ SH → ZZττ)are also set in the ranges 3-26 fb and 6-33 fb, respectively.

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