Search for light long-lived neutral particles produced in pp collisions at √s=13TeV and decaying into collimated leptons or light hadrons with the ATLAS detector

G Aad; B Abbott; DC Abbott; AA Abud; K Abeling; DK Abhayasinghe; SH Abidi; OS AbouZeid; NL Abraham; H Abramowicz; H Abreu; Y Abulaiti; BS Acharya; B Achkar; S Adachi; L Adam; CA Bourdarios; L Adamczyk; L Adamek; J Adelman; M Adersberger; A Adiguzel; S Adorni; T Adye; AA Affolder; Y Afik; C Agapopoulou; MN Agaras; A Aggarwal; C Agheorghiesei; JA Aguilar-Saavedra; F Ahmadov; WS Ahmed; X Ai; G Aielli; S Akatsuka; TPA Åkesson; E Akilli; AV Akimov; KA Khoury; GL Alberghi; J Albert; MJA Verzini; S Alderweireldt; M Aleksa; IN Aleksandrov; C Alexa; D Alexandre; T Alexopoulos; A Alfonsi; M Alhroob; B Ali; G Alimonti; J Alison; SP Alkire; C Allaire; BMM Allbrooke; BW Allen; PP Allport; A Aloisio; A Alonso; F Alonso; C Alpigiani; AA Alshehri; MA Estevez; DÁ Piqueras; MG Alviggi; YA Coutinho; A Ambler; L Ambroz; C Amelung; D Amidei; SPAD Santos; S Amoroso; CS Amrouche; F An; C Anastopoulos; N Andari; T Andeen; CF Anders; JK Anders; A Andreazza; V Andrei; CR Anelli; S Angelidakis; A Angerami; AV Anisenkov; A Annovi; C Antel; MT Anthony; M Antonelli; DJA Antrim; F Anulli; M Aoki; JAA Pozo; LA Bella; G Arabidze; JP Araque; VA Ferraz; RA Pereira

Journal article

Search for light long-lived neutral particles produced in pp collisions at √s=13TeV and decaying into collimated leptons or light hadrons with the ATLAS detector

G Aad, B Abbott, DC Abbott, AA Abud, K Abeling, DK Abhayasinghe, SH Abidi, OS AbouZeid, NL Abraham, H Abramowicz, H Abreu, Y Abulaiti, BS Acharya, B Achkar, S Adachi, L Adam, CA Bourdarios, L Adamczyk, L Adamek, J Adelman Show all

European Physical Journal C | Published : 2020

DOI: 10.1140/epjc/s10052-020-7997-4

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Abstract

Several models of physics beyond the Standard Model predict the existence of dark photons, light neutral particles decaying into collimated leptons or light hadrons. This paper presents a search for long-lived dark photons produced from the decay of a Higgs boson or a heavy scalar boson and decaying into displaced collimated Standard Model fermions. The search uses data corresponding to an integrated luminosity of 36.1 fb- 1 collected in proton–proton collisions at s=13 Te recorded in 2015–2016 with the ATLAS detector at the Large Hadron Collider. The observed number of events is consistent with the expected background, and limits on the production cross section times branching fraction as a..

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University of Melbourne Researchers

Prof Elisabetta Barberio Author

DR Jafar Shojaii Author

Prof G. N. Taylor Author

Prof Phillip Urquijo Author

Grants

Awarded by Departamento Administrativo de Ciencia, Tecnología e Innovación (COLCIENCIAS)

Funding Acknowledgements

We thank CERN for the very successful operation of the LHC, as well as the support staff from our institutions without whom ATLAS could not be operated efficiently.r We acknowledge the support of ANPCyT, Argentina; YerPhI, Armenia; ARC, Australia; BMWFW and FWF, Austria; ANAS, Azerbaijan; SSTC, Belarus; CNPq and FAPESP, Brazil; NSERC, NRC and CFI, Canada; CERN; CONICYT, Chile; CAS, MOST and NSFC, China; COLCIENCIAS, Colombia; MSMTCR, MPOCR and VSCCR, Czech Republic; DNRF and DNSRC, Denmark; IN2P3-CNRS, CEADRF/IRFU, France; SRNSFG, Georgia; BMBF, HGF, and MPG, Germany; GSRT, Greece; RGC, HongKong SAR, China; ISF and Benoziyo Center, Israel; INFN, Italy; MEXT and JSPS, Japan; CNRST, Morocco; NWO, Netherlands; RCN, Norway; MNiSW and NCN, Poland; FCT, Portugal; MNE/IFA, Romania; MES of Russia and NRC KI, Russian Federation; JINR; MESTD, Serbia; MSSR, Slovakia; ARRS andMIZS, Slovenia; DST/NRF, South Africa; MINECO, Spain; SRC and Wallenberg Foundation, Sweden; SERI, SNSF and Cantons of Bern and Geneva, Switzerland; MOST, Taiwan; TAEK, Turkey; STFC, United Kingdom; DOE and NSF, USA. In addition, individual groups and members have received support from BCKDF, CANARIE, CRC and Compute Canada, Canada; COST, ERC, ERDF, Horizon 2020, and Marie Sklodowska-Curie Actions, European Union; Investissements d' Avenir Labex and Idex, ANR, France; DFG and AvH Foundation, Germany; Herakleitos, Thales and Aristeia programmes co-financed by EU-ESF and the Greek NSRF, Greece; BSF-NSF and GIF, Israel; CERCA Programme Generalitat de Catalunya, Spain; The Royal Society and Leverhulme Trust, United Kingdom. The crucial computing support from allWLCG partners is acknowledged gratefully, in particular from CERN, theATLAS Tier-1 facilities at TRIUMF (Canada), NDGF(Denmark, Norway, Sweden), CC-IN2P3 (France), KIT/GridKA (Germany), INFN-CNAF (Italy), NL-T1 (Netherlands), PIC (Spain), ASGC (Taiwan), RAL (UK) and BNL (USA), the Tier-2 facilities worldwide and large non-WLCG resource providers. Major contributors of computing resources are listed in Ref. [100].