Search for light long-lived neutral particles from Higgs boson decays via vector-boson-fusion production from pp collisions at √s=13 TeV with the ATLAS detector

ATLAS Collaboration

Research output: Contribution to journalArticlepeer-review

Abstract

A search is reported for long-lived dark photons with masses between 0.1 GeV and 15 GeV, from exotic decays of Higgs bosons produced via vector-boson-fusion. Events that contain displaced collimated Standard Model fermions reconstructed in the calorimeter or muon spectrometer are probed. This search uses the full LHC Run 2 (2015–2018) data sample collected in proton–proton collisions at s=13 TeV, corresponding to an integrated luminosity of 139 fb-1. Dominant backgrounds from Standard Model processes and non-collision sources are estimated using data-driven techniques. The observed event yields in the signal regions are consistent with the expected background. Upper limits on the Higgs boson to dark photon branching fraction are reported as a function of the dark photon mean proper decay length or of the dark photon mass and the coupling between the Standard Model and the potential dark sector. This search is combined with previous ATLAS searches obtained in the gluon–gluon fusion and WH production modes. A branching fraction above 10% is excluded at 95% CL for a 125 GeV Higgs boson decaying into two dark photons for dark photon mean proper decay lengths between 173 and 1296 mm and mass of 10 GeV.

Original languageEnglish
Article number719
JournalEuropean Physical Journal C
Volume84
Issue number7
DOIs
StatePublished - Jul 2024

Funding

FundersFunder number
BSF-NSF
Australian Research Council
DRAC
La Caixa Banking Foundation
BMWFW
Centre National pour la Recherche Scientifique et Technique
Fundação para a Ciência e a Tecnologia
Investissements d’Avenir Labex
National Science Foundation
Norwegian Financial Mechanism
CEA-DRF
Science and Technology Facilities Council
Horizon 2020, ICSC-NextGenerationEU
H2020 Marie Skłodowska-Curie Actions
HORIZON EUROPE Marie Sklodowska-Curie Actions
INFN-CNAF
Nederlandse Organisatie voor Wetenschappelijk Onderzoek
Ministry of Science and Technology, Taiwan
Israel Science Foundation
Wallenberg Foundation
Leverhulme Trust
Baden-Württemberg Stiftung
PROMETEO
Neubauer Family Foundation
Staatssekretariat für Bildung, Forschung und Innovation
The Slovenian Research and Innovation Agency
Generalitat de Catalunya
Austrian Science Fund
Agencia Nacional de Investigación y Desarrollo
Bundesministerium für Bildung und Forschung
Canada Foundation for Innovation
Helmholtz-Gemeinschaft
Danmarks Grundforskningsfond
Conselho Nacional de Desenvolvimento Científico e Tecnológico
Karlsruhe Institute of Technology
Canarie
GridKA
Göran Gustafssons Stiftelser
MIZŠ
European Commission
Ministarstvo Prosvete, Nauke i Tehnološkog Razvoja
U.S. Department of Energy
European Cooperation in Science and Technology
EU-ESF
International Council of Shopping Centers
RGC
Fundação de Amparo à Pesquisa do Estado de São Paulo
Institutul de Fizică Atomică
Natural Sciences and Engineering Research Council of Canada
Nella and Leon Benoziyo Center for Neurological Diseases, Weizmann Institute of Science
GenT Programmes Generalitat Valenciana, Spain
Irish Rugby Football Union
Cantons of Bern and Geneva
Chinese Academy of Sciences
Defence Science Institute
CRC Health Group
MNE
Agencia Nacional de Promoción Científica y Tecnológica
Royal Society
Minerva Foundation
National Research Foundation
Generalitat Valenciana
CERN
Ministerstvo Školství, Mládeže a Tělovýchovy
National Research Council Canada
Brookhaven National Laboratory
Alexander von Humboldt-Stiftung
Multiple Sclerosis Scientific Research Foundation
British Columbia Knowledge Development Fund
Ministry of Education, Culture, Sports, Science and Technology
Narodowa Agencja Wymiany AkademickiejPPN/PPO/2020/1/00002/U/00001
Fundación BBVALEO22-1-603
H2020 MSC IF101033496
Center for Advancing Research Impact in SocietyJ1-3010
Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen ForschungRPG-2020-004, SNSF-PCEFP2_194658
Knut och Alice Wallenbergs StiftelseKAW 2018.0157, KAW 2017.0100, KAW 2018.0458, KAW 2019.0447
European Regional Development FundIDIFEDER/2018/048, LCF/BQ/PI20/11760025
Ministerio de Ciencia e InnovaciónRYC2020-030254-I, RYC2019-028510-I
Deutsche ForschungsgemeinschaftDFG-CR 312/5-1
DNSRCIN2P3-CNRS
Agence Nationale de la RechercheANR-20-CE31-0013, ANR-21-CE31-0013, ANR-11-LABX-0012, ANR-21-CE31-0022
Narodowe Centrum NaukiUMO-2020/37/B/ST2/01043, UMO-2019/34/E/ST2/00393, 2021/42/E/ST2/00350, 2022/47/B/ST2/03059, UMO-2021/40/C/ST2/00187
Horizon 2020 Framework ProgrammeMUCCA-CHIST-ERA-19-XAI-00
Japan Society for the Promotion of Science22H01227, JP21H05085, JP22H04944
European Research CouncilERC-948254
Instituto Nazionale di Fisica Nucleare754496
UNCESCI/013
GenT Programmes Generalitat ValencianaCIDEGENT/2019/023, CIDEGENT/2019/027
Fondo Nacional de Desarrollo Científico y Tecnológico1230987, 1190886, 1210400
CERN-CZ21/SCI/017
North Dakota Game and Fish DepartmentCC-IN2P3
VetenskapsrådetVR 2018-00482, VR 2022-04683, VR 2022-03845
Norges ForskningsrådRCN-314472
National Natural Science Foundation of China12275265, NSFC-12175119

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