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Search for Higgs boson decays into a pair of pseudoscalar particles in the γγτhadτhad fnal state using pp collisions at √s = 13 TeV with the ATLAS detector ATLAS Collaboration

Abstract

A search for exotic decays of the 125 GeV Higgs boson into a pair of new spin-0 particles, H → aa, where one decays into a photon pair and the other into a τ -lepton pair, is presented. Hadronic decays of the τ -leptons are considered and reconstructed using a dedicated tagger for collimated τ -lepton pairs. The search uses 140 fb−1 of proton-proton collision data at a centre-of-mass energy of √ s = 13 TeV recorded between 2015 and 2018 by the ATLAS experiment at the Large Hadron Collider. The search is performed in the mass range of the a boson between 10 GeV and 60 GeV. No signifcant excess of events is observed above the Standard Model background expectation. Model-independent upper limits at 95% confdence level are set on the branching ratio of the Higgs boson to the γγτ τ fnal state, B(H → aa → γγτ τ ), ranging from 0.2% to 2%, depending on the a-boson mass hypothesis.

Item Metadata

Title
Search for Higgs boson decays into a pair of pseudoscalar particles in the γγτhadτhad fnal state using pp collisions at √s = 13 TeV with the ATLAS detector
Creator
ATLAS Collaboration
Publisher
Springer Berlin Heidelberg
Date Issued
2025-03-25
Description
A search for exotic decays of the 125 GeV Higgs boson into a pair of new spin-0 particles, H → aa, where one decays into a photon pair and the other into a τ -lepton pair, is presented. Hadronic decays of the τ -leptons are considered and reconstructed using a dedicated tagger for collimated τ -lepton pairs. The search uses 140 fb−1 of proton-proton collision data at a centre-of-mass energy of √ s = 13 TeV recorded between 2015 and 2018 by the ATLAS experiment at the Large Hadron Collider. The search is performed in the mass range of the a boson between 10 GeV and 60 GeV. No signifcant excess of events is observed above the Standard Model background expectation. Model-independent upper limits at 95% confdence level are set on the branching ratio of the Higgs boson to the γγτ τ fnal state, B(H → aa → γγτ τ ), ranging from 0.2% to 2%, depending on the a-boson mass hypothesis.
Subject
Hadron-Hadron Scattering
Genre
Article
Type
Text
Language
eng
Date Available
2025-07-15
Provider
Vancouver : University of British Columbia Library
Rights
Attribution 4.0 International (CC BY 4.0)
DOI
10.14288/1.0449402
URI
http://hdl.handle.net/2429/91618
Affiliation
Science, Faculty of; TRIUMF; Non UBC; Physics and Astronomy, Department of
Citation
Journal of High Energy Physics. 2025 Mar 25;2025(3):190
Publisher DOI
10.1007/JHEP03(2025)190
Peer Review Status
Reviewed
Scholarly Level
Faculty; Researcher
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)