Abstract
A search for new phenomena is presented in final states with two leptons and one or no -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 by the ATLAS experiment at the LHC, corresponding to an integrated luminosity of . No significant deviation from the expected background is observed in the data. Inspired by the -meson decay anomalies, a four-fermion contact interaction between two quarks (, ) and two leptons ( or ) is used as a benchmark signal model, which is characterized by the energy scale and coupling, and , respectively. Contact interactions with 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 -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.
- Received 1 June 2021
- Accepted 30 July 2021
DOI:https://doi.org/10.1103/PhysRevLett.127.141801
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© 2021 CERN, for the ATLAS Collaboration