Search for long-lived particles in final states with displaced dimuon vertices in <i>pp</i> collisions at √<i>s</i>=13 TeV with the ATLAS detector



Aaboud, M, Aad, G, Abbott, B, Abdinov, O, Abeloos, B, Abhayasinghe, DK, Abidi, SH, AbouZeid, OS, Abraham, NL, Abramowicz, H
et al (show 2900 more authors) (2019) Search for long-lived particles in final states with displaced dimuon vertices in <i>pp</i> collisions at √<i>s</i>=13 TeV with the ATLAS detector. PHYSICAL REVIEW D, 99 (1). 012001-.

Access the full-text of this item by clicking on the Open Access link.
[img] Text
1808.03057v1.pdf - Submitted version

Download (1MB)

Abstract

A search is performed for a long-lived particle decaying into a final state that includes a pair of muons of opposite-sign electric charge, using proton-proton collision data collected at $\sqrt{s}=$ 13 TeV by the ATLAS detector at the Large Hadron Collider corresponding to an integrated luminosity of 32.9 fb$^{-1}$. No significant excess over the Standard Model expectation is observed. Limits at 95% confidence level on the lifetime of the long-lived particle are presented in models of new phenomena including gauge-mediated supersymmetry or decay of the Higgs boson, $H$, to a pair of dark photons, $Z_D$. Lifetimes in the range c$\tau$ = 1-2400 cm are excluded, depending on the parameters of the model. In the supersymmetric model, the lightest neutralino is the next-to-lightest supersymmetric particle, with a relatively long lifetime due to its weak coupling to the gravitino, the lightest supersymmetric particle. The lifetime limits are determined for very light gravitino mass and various assumptions for the neutralino mass in the range 300 GeV to 1000 GeV. In the dark photon model, the lifetime limits are interpreted as exclusion contours in the plane of the coupling between the $Z_D$ and the Standard Model $Z$ boson versus the $Z_D$ mass (in the range 20-60 GeV), for various assumptions for the $H\rightarrow Z_D Z_D$ branching fraction.

Item Type: Article
Additional Information: 48 pages in total, author list starting page 32, 9 figures, 11 tables, published in Physical Review D. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/EXOT-2017-03
Uncontrolled Keywords: hep-ex, hep-ex
Depositing User: Symplectic Admin
Date Deposited: 10 Sep 2018 15:32
Last Modified: 17 Oct 2023 04:14
DOI: 10.1103/PhysRevD.99.012001
Open Access URL: https://journals.aps.org/prd/pdf/10.1103/PhysRevD....
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3026029