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Search for a CP-odd Higgs boson decaying into a heavy CP-even Higgs boson and a Z boson in the ℓ +ℓ −tt¯ and ννb¯ ¯b fnal states using 140 fb−1 of data collected with the ATLAS detector ATLAS Collaboration

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 ννb¯ ¯b fnal states and surpasses the reach of previous searches in diferent fnal states in the region with mH > 350 GeV and mA > 800 GeV. No signifcant 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(b ¯b) distributions in the ℓ +ℓ −tt¯ and ννb¯ ¯b channels, respectively. In addition, the results are interpreted in the context of two-Higgs-doublet models.

Item Metadata

Title
Search for a CP-odd Higgs boson decaying into a heavy CP-even Higgs boson and a Z boson in the ℓ +ℓ −tt¯ and ννb¯ ¯b fnal states using 140 fb−1 of data collected with the ATLAS detector
Creator
ATLAS Collaboration
Publisher
Springer Berlin Heidelberg
Date Issued
2024-02-26
Description
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 ννb¯ ¯b fnal states and surpasses the reach of previous searches in diferent fnal states in the region with mH > 350 GeV and mA > 800 GeV. No signifcant 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(b ¯b) distributions in the ℓ +ℓ −tt¯ and ννb¯ ¯b channels, respectively. In addition, the results are interpreted in the context of two-Higgs-doublet models.
Subject
Hadron-Hadron Scattering
Genre
Article
Type
Text
Language
eng
Date Available
2024-10-24
Provider
Vancouver : University of British Columbia Library
Rights
Attribution 4.0 International (CC BY 4.0)
DOI
10.14288/1.0447101
URI
http://hdl.handle.net/2429/89525
Affiliation
Science, Faculty of; TRIUMF; Non UBC; Physics and Astronomy, Department of
Citation
Journal of High Energy Physics. 2024 Feb 26;2024(2):197
Publisher DOI
10.1007/JHEP02(2024)197
Peer Review Status
Reviewed
Scholarly Level
Faculty
Copyright Holder
The Author(s)
Rights URI
http://creativecommons.org/licenses/by/4.0/
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Attribution 4.0 International (CC BY 4.0)