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
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Authors
Aad, G
Abbott, B
Abbott, DC
Abud, AA
Abeling, K
Abhayasinghe, DK
Abidi, SH
AbouZeid, OS
Abraham, NL
Abramowicz, H
Abreu, H
Abulaiti, Y
Acharya, BS
Achkar, B
Adachi, S
Adam, L
Bourdarios, CA
Adamczyk, L
Adamek, L
Adelman, J
Adersberger, M
Adiguzel, A
Adorni, S
Adye, T
Affolder, AA
Afik, Y
Agapopoulou, C
Agaras, MN
Aggarwal, A
Agheorghiesei, C
Aguilar-Saavedra, JA
Ahmadov, F
Ahmed, WS
Ai, X
Aielli, G
Akatsuka, S
Åkesson, TPA
Akilli, E
Akimov, AV
Khoury, KA
Alberghi, GL
Albert, J
Verzini, MJA
Alderweireldt, S
Aleksa, M
Aleksandrov, IN
Alexa, C
Alexandre, D
Alexopoulos, T
Alfonsi, A
Alhroob, M
Ali, B
Alimonti, G
Alison, J
Alkire, SP
Allaire, C
Allbrooke, BMM
Allen, BW
Allport, PP
Aloisio, A
Alonso, A
Alonso, F
Alpigiani, C
Alshehri, AA
Estevez, MA
Piqueras, DÁ
Alviggi, MG
Coutinho, YA
Ambler, A
Ambroz, L
Amelung, C
Amidei, D
Santos, SPAD
Amoroso, S
Amrouche, CS
An, F
Anastopoulos, C
Andari, N
Andeen, T
Anders, CF
Anders, JK
Andreazza, A
Andrei, V
Anelli, CR
Angelidakis, S
Angerami, A
Anisenkov, AV
Annovi, A
Antel, C
Anthony, MT
Antonelli, M
Antrim, DJA
Anulli, F
Aoki, M
Pozo, JAA
Bella, LA
Arabidze, G
Araque, JP
Ferraz, VA
Pereira, RA
Journal Title
The European Physical Journal C - Particles and Fields
ISSN
1124-1861
Publisher
Springer Nature
Volume
80
Issue
5
Number
450
Type
Article
This Version
VoR
Metadata
Show full item recordCitation
Aad, G., Abbott, B., Abbott, D., Abud, A., Abeling, K., Abhayasinghe, D., Abidi, S., et al. (2020). 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. The European Physical Journal C - Particles and Fields, 80 (5. 450)https://doi.org/10.1140/epjc/s10052-020-7997-4
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 function of the proper decay length of the dark photon are reported. A cross section times branching fraction above 4 pb is excluded for a Higgs boson decaying into two dark photons for dark-photon decay lengths between 1.5 mm and 307 mm.
Sponsorship
SCIENCE & TECHNOLOGY FACILITIES COUNCIL (ST/N000234/1)
Funder references
SCIENCE & TECHNOLOGY FACILITIES COUNCIL (ST/N000234/1)
Identifiers
External DOI: https://doi.org/10.1140/epjc/s10052-020-7997-4
This record's URL: https://www.repository.cam.ac.uk/handle/1810/305980