Search for displaced vertices of oppositely charged leptons from decays of long-lived particles in $pp$ collisions at $\sqrt{s}$ = 13 TeV with the ATLAS detector

Abstract

A search for long-lived particles decaying into an oppositely charged lepton pair, $\mu \mu$, $ee$, or $e\mu$, is presented using 32.8 fb${}^{-1}$ of $pp$ collision data collected at $\sqrt{s}=13$ TeV by the ATLAS detector at the LHC. Candidate leptons are required to form a vertex, within the inner tracking volume of ATLAS, displaced from the primary $pp$ interaction region. No lepton pairs with an invariant mass greater than 12 GeV are observed, consistent with the background expectations derived from data. The detection efficiencies for generic resonances with lifetimes ($c\tau$) of 100-1000 mm decaying into a dilepton pair with masses between 0.1-1.0 TeV are presented as a function of $p_T$ and decay radius of the resonances to allow the extraction of upper limits on the cross sections for theoretical models. The result is also interpreted in a supersymmetric model in which the lightest neutralino, produced via squark-antisquark production, decays into ${\ell }^{+}{\ell }^{{}^{\prime }-}\nu$ ($\ell ,{\ell }^{{}^{\prime }}=e$, $\mu$) with a finite lifetime due to the presence of R-parity violating couplings. Cross-section limits are presented for specific squark and neutralino masses. For a 700 GeV squark, neutralinos with masses of 50-500 GeV and mean proper lifetimes corresponding to $c\tau$ values between 1 mm to 6 m are excluded. For a 1.6 TeV squark, $c\tau$ values between 3 mm to 1 m are excluded for 1.3 TeV neutralinos.

arXiv comment34 pages in total, author list starting page 18, 5 figures, 2 tables, published in PLB. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/SUSY-2017-04/

References in corpus (40)

• PYTHIA 6.4 Physics and Manual
• PYTHIA 6.2 Physics and Manual
• The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
• An Introduction to PYTHIA 8.2
• A Brief Introduction to PYTHIA 8.1
• Parton distributions for the LHC
• Parton distributions for the LHC Run II
• New parton distributions for collider physics
• Event generation with SHERPA 1.1
• Parton distributions with LHC data
• The ATLAS Simulation Infrastructure
• PDF4LHC recommendations for LHC Run II
• R-parity violating supersymmetry
• Performance of the ATLAS Trigger System in 2015
• Muon reconstruction performance of the ATLAS detector in proton--proton collision data at $\sqrt{s}$=13 TeV
• Production and Integration of the ATLAS Insertable B-Layer
• Squark and Gluino Production at Hadron Colliders
• Threshold resummation for squark-antisquark and gluino-pair production at the LHC
• Soft gluon resummation for the production of gluino-gluino and squark-antisquark pairs at the LHC
• Soft-gluon resummation for squark and gluino hadroproduction
• HistFitter software framework for statistical data analysis
• Phenomenology of Hidden Valleys at Hadron Colliders
• Measurement of the Inelastic Proton-Proton Cross Section at $\sqrt{s}=13$ TeV with the ATLAS Detector at the LHC
• Matching Tree-Level Matrix Elements with Interleaved Showers
• Phenomenology of the minimal B-L extension of the Standard model: Z' and neutrinos
• Electron reconstruction and identification in the ATLAS experiment using the 2015 and 2016 LHC proton-proton collision data at $\sqrt{s}$ = 13 TeV
• Search for massive, long-lived particles using multitrack displaced vertices or displaced lepton pairs in pp collisions at $\sqrt{s}$ = 8 TeV with the ATLAS detector
• NNLL-fast: predictions for coloured supersymmetric particle production at the LHC with threshold and Coulomb resummation
• An Introduction to Explicit R-Parity Violation
• Search for long-lived, massive particles in events with displaced vertices and missing transverse momentum in $\sqrt{s}$ = 13 TeV $pp$ collisions with the ATLAS detector
• Search for long-lived particles that decay into final states containing two electrons or two muons in proton-proton collisions at sqrt(s) = 8 TeV
• Measurement of the photon identification efficiencies with the ATLAS detector using LHC Run 2 data collected in 2015 and 2016
• Search for long-lived neutral particles decaying into lepton jets in proton--proton collisions at $\sqrt{s}$ = 8 TeV with the ATLAS detector
• NNLL resummation for squark and gluino production at the LHC
• NNLL resummation for squark-antisquark pair production at the LHC
• Search for Displaced Supersymmetry in events with an electron and a muon with large impact parameters
• Towards NNLL resummation: hard matching coefficients for squark and gluino hadroproduction
• Search for long-lived particles in final states with displaced dimuon vertices in $pp$ collisions at $\sqrt{s}=$ 13 TeV with the ATLAS detector
• Performance of the reconstruction of large impact parameter tracks in the inner detector of ATLAS
• A measurement of material in the ATLAS tracker using secondary hadronic interactions in 7 TeV pp collisions

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• Higher-spin particles at high-energy colliders
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• An alternative method for searching for dimuon displaced vertices in the short-range region with ATLAS and CMS
• Long-lived Light Mediators in a Higgs Portal Model at the FCC-ee
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• Production and signatures of multi-flavour dark matter scenarios with t-channel mediators