Search for a CP-odd Higgs boson decaying into a heavy CP-even Higgs boson and a Z boson in the ℓ + ℓ − t t ¯ and ν ν ¯ b b ¯ final states using 140 fb − 1 of data collected with the ATLAS detector
Journal of High Energy Physics Springer 2024:2 (2024) 197
Abstract:
A search for a heavy CP-odd Higgs boson, A, decaying into a Z boson and a heavy CP-even Higgs boson, H, is presented. It uses the full LHC Run 2 dataset of pp collisions at s = 13 TeV collected with the ATLAS detector, corresponding to an integrated luminosity of 140 fb−1. The search for A → ZH is performed in the ℓ+ℓ−tt¯ and νν¯bb¯ final states and surpasses the reach of previous searches in different final states in the region with mH > 350 GeV and mA > 800 GeV. No significant deviation from the Standard Model expectation is found. Upper limits are placed on the production cross-section times the decay branching ratios. Limits with less model dependence are also presented as functions of the reconstructed m(tt¯) and m(bb¯) distributions in the ℓ+ℓ−tt¯ and νν¯bb¯ channels, respectively. In addition, the results are interpreted in the context of two-Higgs-doublet models.Search for high-mass resonances in final states with a $τ$-lepton and missing transverse momentum with the ATLAS detector
ArXiv 2402.16576 (2024)
Search for invisible particles produced in association with single top quarks in proton-proton collisions at $\sqrt{s}$=13 TeV with the ATLAS detector
ArXiv 2402.16561 (2024)
Studies of the energy dependence of diboson polarization fractions and the Radiation Amplitude Zero effect in WZ production with the ATLAS detector
ArXiv 2402.16365 (2024)
Study of Z→llγ decays at s = 8 TeV with the ATLAS detector
European Physical Journal C Springer Nature 84:2 (2024) 195