A model-agnostic search for Beyond the Standard Model physics is presented, targeting final states with at least four light leptons (electrons or muons). The search regions are separated by event topology and unsupervised machine learning is used to identify anomalous events in the full 140 fb-1 of proton–proton collision data collected with the ATLAS detector during Run 2. No significant excess above the Standard Model background expectation is observed. Model-agnostic limits are presented in each topology, along with limits on several benchmark models including vector-like leptons, wino-like charginos and neutralinos, or smuons. Limits are set on the flavourful vector-like lepton model for the first time.

Zwalinski, L., Zormpa, O., Zorbas, T.G., Zografos, A., Zoch, K., Zoccoli, A., et al. (2026). Search for Beyond the Standard Model physics with anomaly dvetection in multilepton final states in pp collisions at √s=13 TeV with the ATLAS detector. THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS, 86(3) [10.1140/epjc/s10052-025-15218-2].

Search for Beyond the Standard Model physics with anomaly dvetection in multilepton final states in pp collisions at √s=13 TeV with the ATLAS detector

Cerri A.;
2026-01-01

Abstract

A model-agnostic search for Beyond the Standard Model physics is presented, targeting final states with at least four light leptons (electrons or muons). The search regions are separated by event topology and unsupervised machine learning is used to identify anomalous events in the full 140 fb-1 of proton–proton collision data collected with the ATLAS detector during Run 2. No significant excess above the Standard Model background expectation is observed. Model-agnostic limits are presented in each topology, along with limits on several benchmark models including vector-like leptons, wino-like charginos and neutralinos, or smuons. Limits are set on the flavourful vector-like lepton model for the first time.
2026
Zwalinski, L., Zormpa, O., Zorbas, T.G., Zografos, A., Zoch, K., Zoccoli, A., et al. (2026). Search for Beyond the Standard Model physics with anomaly dvetection in multilepton final states in pp collisions at √s=13 TeV with the ATLAS detector. THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS, 86(3) [10.1140/epjc/s10052-025-15218-2].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11365/1321734