Observation and measurement of forward proton scattering in association with lepton pairs produced via the photon fusion mechanism at ATLAS

Abstract

The observation of forward proton scattering in association with lepton pairs ($e^{+}{e}^{-}+p$ or ${\mu }^{+}{\mu }^{-}+p$) produced via photon fusion is presented. The scattered proton is detected by the ATLAS Forward Proton spectrometer while the leptons are reconstructed by the central ATLAS detector. Proton-proton collision data recorded in 2017 at a center-of-mass energy of $\sqrt{s}=13$ TeV are analyzed, corresponding to an integrated luminosity of 14.6 fb${}^{-1}$. A total of 57 (123) candidates in the $ee+p$ ($\mu \mu +p$) final state are selected, allowing the background-only hypothesis to be rejected with a significance exceeding five standard deviations in each channel. Proton-tagging techniques are introduced for cross-section measurements in the fiducial detector acceptance, corresponding to ${\sigma }_{ee+p}$ = 11.0 $\pm$ 2.6 (stat.) $\pm$ 1.2 (syst.) $\pm$ 0.3 (lumi.) fb and ${\sigma }_{\mu \mu +p}$ = 7.2 $\pm$ 1.6 (stat.) $\pm$ 0.9 (syst.) $\pm$ 0.2 (lumi.) fb in the dielectron and dimuon channel, respectively.

arXiv comment31 pages in total, author list starting page 15, 3 figures, 1 table, submitted to Phys. Rev. Lett. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/STDM-2018-16/

References in corpus (59)

• Asymptotic formulae for likelihood-based tests of new physics
• Herwig++ Physics and Manual
• The ATLAS Simulation Infrastructure
• Herwig 7.0 / Herwig++ 3.0 Release Note
• Magnetars
• 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
• The Physics of Ultraperipheral Collisions at the LHC
• Production and Integration of the ATLAS Insertable B-Layer
• Electron-positron pairs in physics and astrophysics: from heavy nuclei to black holes
• Performance of electron and photon triggers in ATLAS during LHC Run 2
• ATLAS data quality operations and performance for 2015-2018 data-taking
• Performance of the ATLAS muon triggers in Run 2
• HistFitter software framework for statistical data analysis
• Search for electroweak production of charginos and sleptons decaying into final states with two leptons and missing transverse momentum in $\sqrt{s}=13$ TeV $pp$ collisions using the ATLAS detector
• Prospects for New Physics observations in diffractive processes at the LHC and Tevatron
• The Extragalactic Background Light and the Gamma-ray Opacity of the Universe
• Electron reconstruction and identification in the ATLAS experiment using the 2015 and 2016 LHC proton-proton collision data at $\sqrt{s}$ = 13 TeV
• Evidence for light-by-light scattering and searches for axion-like particles in ultraperipheral PbPb collisions at $\sqrt{s_{\mathrm{NN}}}=$ 5.02 TeV
• Searches for electroweak production of supersymmetric particles with compressed mass spectra in $\sqrt{s}=13$ TeV $pp$ collisions with the ATLAS detector
• Pair production in laser fields oscillating in space and time
• Performance of the ATLAS Track Reconstruction Algorithms in Dense Environments in LHC Run 2
• Observation of light-by-light scattering in ultraperipheral Pb+Pb collisions with the ATLAS detector
• Photoproduction of J/psi and of high mass e+e- in ultra-peripheral Au+Au collisions at sqrt(s_NN) = 200 GeV
• Tagging Two-Photon Production at the LHC
• The FP420 R&D Project: Higgs and New Physics with forward protons at the LHC
• Consequences of Dirac Theory of the Positron
• Coherent J/$\psi$ photoproduction at forward rapidity in ultra-peripheral Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV
• Central exclusive production of $J/\psi$ and $\psi (2S)$ mesons in $pp$ collisions at $\sqrt{s}=13$TeV
• Exclusive photon-photon production of muon pairs in proton-proton collisions at sqrt(s) = 7 TeV
• Evidence for exclusive gamma gamma to W+W- production and constraints on anomalous quartic gauge couplings in pp collisions at sqrt(s) = 7 and 8 TeV
• Studying the MSSM Higgs sector by forward proton tagging at the LHC
• Observation of centrality-dependent acoplanarity for muon pairs produced via two-photon scattering in Pb+Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV with the ATLAS detector
• Search for exclusive or semi-exclusive photon pair production and observation of exclusive and semi-exclusive electron pair production in pp collisions at sqrt(s) = 7 TeV
• Searching for axion-like particles with proton tagging at the LHC
• Exclusive physics at the LHC with SuperChic 2
• Diffraction at the LHC
• The photon PDF in events with rapidity gaps
• A new approach to modelling elastic and inelastic photon-initiated production at the LHC: SuperChic 4
• Anomalous electromagnetic moments of $\tau$ lepton in $\gamma \gamma \to {\tau }^{+}{\tau }^{-}$ reaction in Pb+Pb collisions at the LHC
• Observation of proton-tagged, central (semi)exclusive production of high-mass lepton pairs in pp collisions at 13 TeV with the CMS-TOTEM precision proton spectrometer
• Measurement of the exclusive $\gamma \gamma \to {\mu }^{+}{\mu }^{-}$ process in proton--proton collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• The role of finite-size effects on the spectrum of equivalent photons in proton-proton collisions at the LHC
• Measurement of exclusive $\gamma \gamma \to {\ell }^{+}{\ell }^{-}$ production in proton-proton collisions at $\sqrt{s}=7$ TeV with the ATLAS detector
• New physics and tau $g-2$ using LHC heavy ion collisions
• LHC Searches for Dark Matter in Compressed Mass Scenarios: Challenges in the Forward Proton Mode
• Letter of Intent for the LUXE Experiment
• Detecting Higgs bosons in the bb decay channel using forward proton tagging at the LHC
• Photon collider search strategy for sleptons and dark matter at the LHC
• High Energy Two-Photon Interactions at the LHC
• Beam tests of an integrated prototype of the ATLAS Forward Proton detector
• 3D silicon pixel detectors for the ATLAS Forward Physics experiment
• Measuring the masses of a pair of semi-invisibly decaying particles in central exclusive production with forward proton tagging
• Module production of the one-arm AFP 3D pixel tracker
• Transport Simulation and Diffractive Event Reconstruction at the LHC
• Pinning down the gauge boson couplings in $WW\gamma$ production using forward proton tagging
• On the Possibility of Measuring the Single-tagged Exclusive Jets at the LHC
• High energy photon interactions at the LHC
• Alignment-related Effects in Forward Proton Experiments at the LHC

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• The ALICE experiment: a journey through QCD
• gamma-UPC: Automated generation of exclusive photon-photon processes in ultraperipheral proton and nuclear collisions with varying form factors
• Observation of the $\gamma \gamma \to \tau \tau$ process in Pb+Pb collisions and constraints on the $\tau$-lepton anomalous magnetic moment with the ATLAS detector
• Opportunities for new physics searches with heavy ions at colliders
• Elastic photon-initiated production at the LHC: the role of hadron-hadron interactions
• Challenging exclusive top quark pair production at low and high luminosity LHC
• A new calculation of semi-exclusive axion-like particle production at the LHC
• Proton reconstruction with the CMS-TOTEM Precision Proton Spectrometer
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• Modelling $W^{+}{W}^{-}$ production with rapidity gaps at the LHC
• Electroweak, QCD and flavour physics studies with ATLAS data from Run 2 of the LHC
• Exclusive doubly charged Higgs boson pair production in $pp$ collisions at the LHC
• Exclusive photon-fusion production of even-spin resonances and exotic QED atoms in high-energy hadron collisions
• Strategy to measure tau $g-2$ via photon fusion in LHC proton collisions
• Non-exclusive particle production by $\gamma \gamma$ interactions in $pp$ collisions at the LHC
• Physics perspectives of a CMS near-beam proton spectrometer at the HL-LHC
• Photoproduction of lepton pair in ultra-relativistic heavy-ion collisions
• Search for noncommutative interactions in $\gamma \gamma \to \gamma \gamma$ process at the LHC
• Physics with high-luminosity proton-nucleus collisions at the LHC
• Semiexclusive dilepton production in proton-proton collisions with one forward proton measurement at the LHC
• Probing Geometry of Ion-Ion Collisions with Roman Pot Detectors
• Weak interaction corrections to muon pair production via the photon fusion at the LHC