Search for quantum black hole production in lepton+jet final states using proton-proton collisions at $\sqrt{s}$ = 13 TeV with the ATLAS detector

Abstract

A search for quantum black holes in electron+jet and muon+jet invariant mass spectra is performed with 140 fb${}^{-1}$ of data collected by the ATLAS detector in proton-proton collisions at $\sqrt{s}$ = 13 TeV at the Large Hadron Collider. The observed invariant mass spectrum of lepton+jet pairs is consistent with Standard Model expectations. Upper limits are set at 95% confidence level on the production cross-sections times branching fractions for quantum black holes decaying into a lepton and a quark in a search region with invariant mass above 2.0 TeV. The resulting quantum black hole lower mass threshold limit is 8.8 TeV in the Arkani-Hamed-Dimopoulos-Dvali model, and 6.3 TeV in the Randall-Sundrum model.

41 pages, author list starting page 24, 4 figures, 5 tables, published in Phys. Rev. D, All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/EXOT-2018-14/. This version takes into account the changes published in the erratum Phys. Rev. D 114 (2026) 039901

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