학술논문
Search for a CP-odd Higgs boson decaying into a heavy CP-even Higgs boson and a Z boson in the ℓ+ℓ−tt¯νν¯bb¯ and ℓ+ℓ−tt¯νν¯bb¯ final states using 140 fb−1 of data collected with the ATLAS detector
Document Type
Original Paper
Author
Source
Journal of High Energy Physics. 2024(2)
Subject
Language
English
ISSN
1029-8479
Abstract
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 sℓ+ℓ−tt¯νν¯bb¯tt¯bb¯ℓ+ℓ−tt¯νν¯bb¯ = 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 sℓ+ℓ−tt¯νν¯bb¯tt¯bb¯ℓ+ℓ−tt¯νν¯bb¯ and sℓ+ℓ−tt¯νν¯bb¯tt¯bb¯ℓ+ℓ−tt¯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(sℓ+ℓ−tt¯νν¯bb¯tt¯bb¯ℓ+ℓ−tt¯νν¯bb¯) and m(sℓ+ℓ−tt¯νν¯bb¯tt¯bb¯ℓ+ℓ−tt¯νν¯bb¯) distributions in the sℓ+ℓ−tt¯νν¯bb¯tt¯bb¯ℓ+ℓ−tt¯νν¯bb¯ and sℓ+ℓ−tt¯νν¯bb¯tt¯bb¯ℓ+ℓ−tt¯νν¯bb¯ channels, respectively. In addition, the results are interpreted in the context of two-Higgs-doublet models.