Aad, G;
Abbott, B;
Abbott, DC;
Abud, AA;
Abeling, K;
Abhayasinghe, DK;
Abidi, SH;
... et al, .; + view all
(2020)
Search for light long-lived neutral particles produced in pp collisions at √s = 13 TeV and decaying into collimated leptons or light hadrons with the ATLAS detector.
European Physical Journal C
, 80
(5)
, Article 450. 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 TeV 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.
| Type: | Article |
|---|---|
| Title: | Search for light long-lived neutral particles produced in pp collisions at √s = 13 TeV and decaying into collimated leptons or light hadrons with the ATLAS detector |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1140/epjc/s10052-020-7997-4 |
| Publisher version: | https://doi.org/10.1140/epjc/s10052-020-7997-4 |
| Language: | English |
| Additional information: | © 2020 Springer Nature. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/). |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10100596 |
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