Search for a new scalar decaying into new spin-1 bosons in four-lepton final states with the ATLAS detector
Date
2025
Authors
Aad, G.
Abbott, B.
Abeling, K.
Abicht, N.J.
Abidi, S.H.
Aboulhorma, A.
Abramowicz, H.
Abreu, H.
Abulaiti, Y.
Abusleme Hoffman, A.C.
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Journal article
Citation
Physics Letters B, 2025; 865:139472-1-139472-24
Statement of Responsibility
The ATLAS Collaboration
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Abstract
A search is conducted for a new scalar boson 𝑆, with a mass distinct from that of the Higgs boson, decaying promptly into four leptons (𝓁 = 𝑒, 𝜇) via an intermediate state containing two on-shell, promptly decaying new spin-1 bosons 𝑍(d): 𝑆 →𝑍(d)𝑍(d) →4𝓁, where the 𝑍(d) boson has a mass between 15 and 300 GeV, and the 𝑆 boson has a mass between either 30 and 115 GeV or 130 and 800 GeV. The search uses proton–proton collision data collected with the ATLAS detector at the Large Hadron Collider with an integrated luminosity of 139 fb(−1) at a centre-of-mass energy of √ 𝑠 = 13 TeV. No significant excess above the Standard Model background expectation is observed. Upper limits at 95% confidence level are set on the production cross-section times branching ratio, 𝜎(𝑔𝑔 →𝑆) × Β(𝑆 →𝑍(d)𝑍(d) →4𝓁), as a function of the mass of both particles, 𝑚(𝑆) and 𝑚(𝑍)(d).
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© 2025 CERN for the benefit of the ATLAS Collaboration. Published by Elsevier B.V. Funded by SCOAP³. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).