Search for a new scalar decaying into new spin-1 bosons in four-lepton final states with the ATLAS detector

Abstract

A search is conducted for a new scalar boson $S$, with a mass distinct from that of the Higgs boson, decaying into four leptons ($\ell =$ $e$, $\mu$) via an intermediate state containing two on-shell, promptly decaying new spin-1 bosons $Z_{\text{d}}$: $S\to Z_{\text{d}}{Z}_{\text{d}}\to 4\ell$, where the $Z_{\text{d}}$ 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 $\sqrt{s}=13$ 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, $\sigma (gg\to S)\times \mathcal{B}(S\to Z_{\text{d}}{Z}_{\text{d}}\to 4\ell )$, as a function of the mass of both particles, $m_S$ and $m_{Z\text{d}}$.

36 pages in total, author list starting page 19, 6 figures, 1 table, published in Phys. Lett. B. All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HDBS-2021-13

References in corpus (5)

• The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
• A parton shower algorithm based on Catani-Seymour dipole factorisation
• Illuminating Dark Photons with High-Energy Colliders
• Higgs boson decays to four fermions through an abelian hidden sector
• eHDECAY: an Implementation of the Higgs Effective Lagrangian into HDECAY

Cited by in corpus (1)

• Status of ${\mathbb{Z}}_3$-NMSSM featuring a light bino-dominated LSP and a light singlet-like scalar under the LZ Experiment