Search for New Phenomena in Final States with Two Leptons and One or No <i>b</i>-Tagged Jets at √<i>S</i>=13 TeV Using the ATLAS Detector



Aad, G, Abbott, B, Abbott, DC, Abud, A Abed, Abeling, K, Abhayasinghe, DK, Abidi, SH, Abramowicz, H, Abreu, H, Abulaiti, Y
et al (show 2860 more authors) (2021) Search for New Phenomena in Final States with Two Leptons and One or No <i>b</i>-Tagged Jets at √<i>S</i>=13 TeV Using the ATLAS Detector. PHYSICAL REVIEW LETTERS, 127 (14). 141801-.

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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 sqrt[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. Inspired by the B-meson decay anomalies, a four-fermion contact interaction between two quarks (b, s) and two leptons (ee or μμ) is used as a benchmark signal model, which 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 that is favored by the B-meson decay anomalies. Model-independent limits are set as a function of the minimum dilepton invariant mass, which allow the results to be reinterpreted in various signal scenarios.

Item Type: Article
Additional Information: 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/
Uncontrolled Keywords: ATLAS Collaboration
Divisions: Faculty of Science and Engineering > School of Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 12 Jan 2022 14:43
Last Modified: 06 Oct 2023 10:11
DOI: 10.1103/PhysRevLett.127.141801
Open Access URL: https://doi.org/10.1103/PhysRevLett.127.141801
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3143760

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