Search for new phenomena in final states with two leptons and one or no b-tagged jets at √s = 13 TeV using the ATLAS detector

ATLAS Collaboration

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Abstract

A search for new phenomena is presented in final states with two leptons and one or no b-tagged jets. The event selection requires the two leptons to have opposite charge, the same flavor (electrons or muons), and a large invariant mass. The analysis is based on the full Run-2 proton-proton collision dataset recorded at a center-of-mass energy of √s = 13 TeV by the ATLAS experiment at the LHC, corresponding to an integrated luminosity of 139 fb−1. No significant deviation from the expected background is observed in the data. A four-fermion contact interaction between two quarks (b,s) and two leptons (ee or μμ), inspired by the B-meson decay anomalies, is used as a benchmark signal model. This model is characterized by the energy scale and coupling, Λ and g∗ respectively. Contact interactions with Λ/g∗ lower than 2.0 (2.4) TeV are excluded for electrons (muons) at the 95% confidence level, still far below the value which is favored by the B-meson decay anomalies. In addition, model-independent limits are set as a function of the selection on the dilepton invariant mass, which allows the results to be reinterpreted in other signal scenarios.
Original languageEnglish
Article number141801
JournalPhysical Review Letters
Volume127
DOIs
Publication statusPublished - 1 Oct 2021

Bibliographical note

32 pages in total, author list starting page 12, 4 figures, 1 table, submitted to PRL. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/EXOT-2018-16/

Keywords

  • hep-ex

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