Search for short- and long-lived axion-like particles in H→aa→4γ decays with the ATLAS experiment at the LHC

ATLAS Collaboration [email protected]

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

Presented is the search for anomalous Higgs boson decays into two axion-like particles (ALPs) using the full Run 2 data set of 140fb-1 of proton-proton collisions at a centre-of-mass energy of 13TeV recorded by the ATLAS experiment. The ALPs are assumed to decay into two photons, providing sensitivity to recently proposed models that could explain the (g-2)μ discrepancy. This analysis covers an ALP mass range from 100 to 62GeV and ALP-photon couplings in the range 10-7TeV-1<Caγγ/Λ<1TeV-1, and therefore includes signatures with significantly displaced vertices and highly collinear photons. No significant excess of events above the Standard Model background is observed. Upper limits at 95% confidence level are placed on the branching ratio of the Higgs boson to two ALPs in the four-photon final state, and are in the range of 10-5 to 3×10-2, depending on the hypothesized ALP mass and ALP-photon coupling strength.

Original languageEnglish
Article number742
JournalEuropean Physical Journal C
Volume84
Issue number7
DOIs
StatePublished - Jul 2024

Funding

FundersFunder number
BSF-NSF
DRAC
La Caixa Banking Foundation
BMWFW
NAWA
Investissements d’Avenir Labex
SERI
FAPESP
ANPCyT
CEA-DRF
Horizon 2020, ICSC-NextGenerationEU
H2020 Marie Skłodowska-Curie Actions
CFI
CAS
Nederlandse Organisatie voor Wetenschappelijk Onderzoek
Ministry of Science and Innovation
Wallenberg Foundation
ISF
Leverhulme Trust
Baden-Württemberg Stiftung
PROMETEO
Neubauer Family Foundation
Javna Agencija za Raziskovalno Dejavnost RS
NCN
Generalitat de Catalunya
IFA
FCT
BCKDF
MSSR
ERDF
Agencia Nacional de Investigación y Desarrollo
CNRST
NSF
Canarie
ERC
Horizon 2020 Framework Programme
Göran Gustafssons Stiftelser
MIZŠ
NRF
European Commission
NSFC
MESTD
DOE
EU-ESF
COST
CRC
RGC
SNSF
JSPS
ARC
ARRS
MEXT
ICSC
ANR
HGF
FWF
STFC
MEYS CR
NSERC
Nella and Leon Benoziyo Center for Neurological Diseases, Weizmann Institute of Science
GenT Programmes Generalitat Valenciana, Spain
DNRF
BMBF
ANID
Cantons of Bern and Geneva
NRC
MICINN
MNE
Royal Society
Minerva Foundation
NWO
MoST
IRFU
Generalitat Valenciana
CERN
DFG
AvH Foundation
DSI
INFN
CNPq
H2020 MSC IF101033496
NextGenEUPCI2022-135018-2
Knut och Alice Wallenbergs StiftelseKAW 2018.0157, KAW 2017.0100, KAW 2018.0458, KAW 2019.0447
MICINPID2021-125273NB, RYC20 19-028510-I, RYC2020-030254-I
National Natural Science Foundation of China12275265, NSFC-12175119, NSFC-12075060
Norwegian Financial Mechanism2014-2021
Instituto Nazionale di Fisica Nucleare754496
Deutsche ForschungsgemeinschaftDFG-CR 312/5-1
MUCCACHIST-ERA-19-XAI-00
FEDERIDIFEDER/2018/048, LCF/BQ/PI20/1 1760025
UNCESCI/013
Swedish Research CouncilVR 2018-00482, 2021-03651, VR 2022-04683, VR 2022-03845
ARISJ1-3010
Japan Society for the Promotion of ScienceJP21H05085, JP22H04944, JP22H01227
Polish National Agency for Academic ExchangePPN/PPO/2020/1/00002/U/00001
CERN-CZ21/SCI/017
Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen ForschungRPG-2020-004, SNSF-PCEFP2_194658
Polish National Science CentreUMO-2020/37/B/ST2/01043, UMO-2019/34/E/ST2/00393, 2021/42/E/ST2/00350, UMO-2021/40/C/ST2/00187
FONDECYT1230987, 1190886, 1210400
GenT Programmes Generalitat ValencianaCIDEGENT/2019/023, CIDEGENT/2019/027
European Research Council948254
Norges ForskningsrådRCN-314472
DNSRCIN2P3-CNRS
Agence Nationale de la RechercheANR-20-CE31-0013, ANR-21-CE31-0013, ANR-11-LABX-0012, ANR-21-CE31-0022
Fundación BBVALEO22-1-603

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