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

Franconi, Laura; Haug, Sigve; Weber, Michele; Anders, John Kenneth; Beck, Hans Peter; Ereditato, Antonio; Miucci, Antonio; Merlassino, Claudia; Weston, Thomas Daniel (2020). Search for light long-lived neutral particles produced in pp collisions at \sqrts = 13 TeV and decaying into collimated leptons or light hadrons with the ATLAS detector. European physical journal. C - particles and fields, 80(5) EDP Sciences 10.1140/epjc/s10052-020-7997-4

Preview

Text Aad2020_Article_SearchForLightLong-livedNeutra.pdf - Published Version Available under License Creative Commons: Attribution (CC-BY). Download (1MB) | Preview

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.

Interest & Impact

Downloads

42 since deposited on 02 Jun 2021
21 in the past 12 months

Citations

5 Citations in Web of Science ®
6 Citations in Scopus

Search

in Google Scholar™

Services

Actions (login required)

Edit item

Actions (login required)

Edit item