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Measurement of high-mass t t ¯ ℓ + ℓ - production and lepton flavour universality-inspired effective field theory interpretations at s = 13   Te V with the ATLAS detector ATLAS Collaboration

Abstract

Measurements of t t ¯ ℓ + ℓ - production in the region of high dilepton invariant mass with effective field theory (EFT) interpretations are presented. They are performed using final states with three isolated leptons (electrons or muons) and are based on s = 13   Te V proton–proton collision data with an integrated luminosity of 140 fb - 1 , recorded from 2015 to 2018 with the ATLAS detector at the Large Hadron Collider. Measurements of the t t ¯ ℓ + ℓ - signal strength and cross-section upper-limits are performed inclusively in lepton flavour and separately for electrons and muons. The study also aims to probe anomalous four-fermion interactions including to test for possible lepton flavor universality violation. No significant deviations from the Standard Model predictions are observed and the measurements are interpreted through the EFT formalism to provide new constraints on the relevant operators.

Item Metadata

Title
Measurement of high-mass t t ¯ ℓ + ℓ - production and lepton flavour universality-inspired effective field theory interpretations at s = 13   Te V with the ATLAS detector
Creator
ATLAS Collaboration
Publisher
Springer Berlin Heidelberg
Date Issued
2025-12-18
Description
Measurements of t t ¯ ℓ + ℓ - production in the region of high dilepton invariant mass with effective field theory (EFT) interpretations are presented. They are performed using final states with three isolated leptons (electrons or muons) and are based on s = 13   Te V proton–proton collision data with an integrated luminosity of 140 fb - 1 , recorded from 2015 to 2018 with the ATLAS detector at the Large Hadron Collider. Measurements of the t t ¯ ℓ + ℓ - signal strength and cross-section upper-limits are performed inclusively in lepton flavour and separately for electrons and muons. The study also aims to probe anomalous four-fermion interactions including to test for possible lepton flavor universality violation. No significant deviations from the Standard Model predictions are observed and the measurements are interpreted through the EFT formalism to provide new constraints on the relevant operators.
Genre
Article
Type
Text
Language
eng
Date Available
2025-12-24
Provider
Vancouver : University of British Columbia Library
Rights
Attribution 4.0 International (CC BY 4.0)
DOI
10.14288/1.0451083
URI
http://hdl.handle.net/2429/93243
Affiliation
Science, Faculty of; TRIUMF; Non UBC; Physics and Astronomy, Department of
Citation
The European Physical Journal C. 2025 Dec 18;85(12):1434
Publisher DOI
10.1140/epjc/s10052-025-14695-9
Peer Review Status
Reviewed
Scholarly Level
Faculty; Researcher
Copyright Holder
CERN for the benefit of the ATLAS Collaboration
Rights URI
http://creativecommons.org/licenses/by/4.0/
Aggregated Source Repository
DSpace

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Attribution 4.0 International (CC BY 4.0)