Search for light neutral particles decaying promptly into collimated pairs of electrons or muons in $pp$ collisions at $\sqrt{s}$ = 13 TeV with the ATLAS detector

Abstract

A search for a dark photon, a new light neutral particle, which decays promptly into collimated pairs of electrons or muons is presented. The search targets dark photons resulting from the exotic decay of the Standard Model Higgs boson, assuming its production via the dominant gluon-gluon fusion mode. The analysis is based on 140 fb${}^{-1}$ of data collected with the ATLAS detector at the Large Hadron Collider from proton-proton collisions at a center-of-mass energy of 13 TeV. Events with collimated pairs of electrons or muons are analysed and background contributions are estimated using data-driven techniques. No significant excess in the data above the Standard Model background is observed. Upper limits are set at 95% confidence level on the branching ratio of the Higgs boson decay into dark photons between 0.001% and 5%, depending on the assumed dark photon mass and signal model.

arXiv comment44 pages in total, author list starting page 27, 8 figures, 3 tables, published by EPJC. All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/EXOT-2018-55/

References in corpus (90)

• The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
• The anti-k_t jet clustering algorithm
• An Introduction to PYTHIA 8.2
• A Brief Introduction to PYTHIA 8.1
• FastJet user manual
• Asymptotic formulae for likelihood-based tests of new physics
• A general framework for implementing NLO calculations in shower Monte Carlo programs: the POWHEG BOX
• A New Method for Combining NLO QCD with Shower Monte Carlo Algorithms
• Matching NLO QCD computations with Parton Shower simulations: the POWHEG method
• Parton distributions for the LHC Run II
• Parton distributions with LHC data
• The ATLAS Simulation Infrastructure
• Scattering Amplitudes with Open Loops
• A parton shower algorithm based on Catani-Seymour dipole factorisation
• A Positive-Weight Next-to-Leading-Order Monte Carlo for Heavy Flavour Hadroproduction
• Better Jet Clustering Algorithms
• QCD Matrix Elements + Parton Showers
• Comix, a new matrix element generator
• Event Generation with Sherpa 2.2
• QCD matrix elements + parton showers: The NLO case
• High-precision QCD at hadron colliders: electroweak gauge boson rapidity distributions at NNLO
• Performance of the ATLAS Trigger System in 2015
• Secluded U(1) below the weak scale
• QCD matrix elements and truncated showers
• Collier: a fortran-based Complex One-Loop LIbrary in Extended Regularizations
• New Fixed-Target Experiments to Search for Dark Gauge Forces
• A critical appraisal of NLO+PS matching methods
• Production and Integration of the ATLAS Insertable B-Layer
• OpenLoops 2
• Search for a dark photon in e+e- collisions at BABAR
• Performance of pile-up mitigation techniques for jets in $pp$ collisions at $\sqrt{s}=8$ TeV using the ATLAS detector
• Electron and photon performance measurements with the ATLAS detector using the 2015-2017 LHC proton-proton collision data
• Supernova 1987A Constraints on Sub-GeV Dark Sectors, Millicharged Particles, the QCD Axion, and an Axion-like Particle
• A detailed map of Higgs boson interactions by the ATLAS experiment ten years after the discovery
• Illuminating Dark Photons with High-Energy Colliders
• Jet energy scale measurements and their systematic uncertainties in proton-proton collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• Performance of electron and photon triggers in ATLAS during LHC Run 2
• Muon reconstruction and identification efficiency in ATLAS using the full Run 2 $pp$ collision data set at $\sqrt{s}=13$ TeV
• ATLAS data quality operations and performance for 2015-2018 data-taking
• Performance of the ATLAS muon triggers in Run 2
• Search for a new gauge boson in the $A^{\prime }$ Experiment (APEX)
• Non-Abelian Dark Sectors and Their Collider Signatures
• Kinetic Mixing of the Photon with Hidden U(1)s in String Phenomenology
• LHC Signals for a SuperUnified Theory of Dark Matter
• Probing a Secluded U(1) at B-factories
• New Exclusion Limits on Dark Gauge Forces from Proton Bremsstrahlung in Beam-Dump Data
• Search for $A^{\prime }\to {\mu }^{+}{\mu }^{-}$ decays
• Measurement of the Inelastic Proton-Proton Cross Section at $\sqrt{s}=13$ TeV with the ATLAS Detector at the LHC
• New Exclusion Limits for Dark Gauge Forces from Beam-Dump Data
• Searching for the light dark gauge boson in GeV-scale experiments
• Discovering New Light States at Neutrino Experiments
• Search for Dimuon Decays of a Light Scalar Boson in Radiative Transitions Upsilon -> gamma A0
• Constraints on sub-GeV hidden sector gauge bosons from a search for heavy neutrino decays
• Limit on the production of a light vector gauge boson in phi meson decays with the KLOE detector
• Luminosity determination in $pp$ collisions at $\sqrt{s}=13$ TeV using the ATLAS detector at the LHC
• Search for Light Gauge Bosons of the Dark Sector at the Mainz Microtron
• Search for hidden-sector bosons in $B^0\to K^{\ast 0}{\mu }^{+}{\mu }^{-}$ decays
• Search for a vector gauge boson in phi meson decays with the KLOE detector
• Search for a dark photon in the ${\pi }^0\to e^{+}{e}^{-}\gamma$ decay
• Dark Side of Higgs Diphoton Decays and Muon g-2
• Constraints on Hidden Photon Models from Electron g-2 and Hydrogen Spectroscopy
• Hidden Higgs Decaying to Lepton Jets
• A search for pair production of new light bosons decaying into muons
• Supernova Constraints on MeV Dark Sectors from e+ e- Annihilations
• A Search for Dark Higgs Bosons
• Search for a non-standard-model Higgs boson decaying to a pair of new light bosons in four-muon final states
• Discovering Higgs Decays to Lepton Jets at Hadron Colliders
• Search for the dark photon and the dark Higgs boson at Belle
• Search for Long-Lived Particles in $e^{+}{e}^{-}$ Collisions
• Search for Dark Photons with the FASER detector at the LHC
• Dark Photon Search in the Mass Range Between 1.5 and 3.4 GeV/$c^2$
• A search for prompt lepton-jets in $pp$ collisions at $\sqrt{s}=$ 8 TeV with the ATLAS detector
• The ATLAS Inner Detector Trigger performance in pp collisions at 13 TeV during LHC Run 2
• Search for long-lived particles in final states with displaced dimuon vertices in $pp$ collisions at $\sqrt{s}=$ 13 TeV with the ATLAS detector
• Search for Light Resonances Decaying into Pairs of Muons as a Signal of New Physics
• Search for dark Higgsstrahlung in e+ e- -> mu+ mu- and missing energy events with the KLOE experiment
• Exotic Higgs decays in the golden channel
• Measurement of $\mathcal{B}(J/\psi \to {\eta }^{\prime }{e}^{+}{e}^{-}$) and search for a dark photon
• Search for boosted diphoton resonances in the 10 to 70 GeV mass range using 138 fb${}^{-1}$ of 13 TeV $pp$ collisions with the ATLAS detector
• Search for low-mass dilepton resonances in Higgs boson decays to four-lepton final states in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• Search for long-lived particles decaying into muon pairs in proton-proton collisions at $\sqrt{s}=$ 13 TeV collected with a dedicated high-rate data stream
• Search for Higgs bosons decaying into new spin-0 or spin-1 particles in four-lepton final states with the ATLAS detector with 139 fb${}^{-1}$ of $pp$ collision data at $\sqrt{s}=13$ TeV
• Search for WH production with a light Higgs boson decaying to prompt electron-jets in proton-proton collisions at sqrt(s)=7 TeV with the ATLAS detector
• Search for a dark photon and an invisible dark Higgs boson in ${\mu }^{+}{\mu }^{-}$ and missing energy final states with the Belle II experiment
• Search for light long-lived neutral particles that decay to collimated pairs of leptons or light hadrons in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• Search for a dark vector gauge boson decaying to ${\pi }^{+}{\pi }^{-}$ using $\eta \to {\pi }^{+}{\pi }^{-}\gamma$ decays
• Search for direct production of GeV-scale resonances decaying to a pair of muons in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• Search for long-lived particles decaying to final states with a pair of muons in proton-proton collisions at $\sqrt{s}$ = 13.6 TeV
• Search for light long-lived neutral particles from Higgs boson decays via vector-boson-fusion production from $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• Search for the dark photon in $B^0\to A^{\prime }{A}^{\prime }$, $A^{\prime }\to e^{+}{e}^{-}$, ${\mu }^{+}{\mu }^{-}$, and ${\pi }^{+}{\pi }^{-}$ decays at Belle

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