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Article
Report number arXiv:2403.06742 ; CERN-EP-2024-061
Title Search for charged-lepton-flavour violating μτqtμτqt interactions in top-quark production and decay in pppp collisions at s=13s=13 TeV with the ATLAS detector at the LHC
Author(s) ATLAS Collaboration  Prikaži svih 2957 autora
Corporate Author(s) ATLAS Collaboration
Publication 2024-07-01
Imprint 12 Mar 2024
Number of pages 35
Note 54 pages in total, author list starting page 37, 7 figures, 9 tables. All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/TOPQ-2023-23
In: Phys. Rev. D 110 (2024) 012014
DOI 10.1103/PhysRevD.110.012014 (publication)
Subject category Particle Physics - Experiment
Accelerator/Facility, Experiment CERN LHC ; ATLAS
Free keywords exotics ; particle and resonance production ; experimental results ; Top lepton flavour violation search
Abstract A search for charged-lepton-flavour violating μτqtμτqt (q=u,cq=u,c) interactions is presented, considering both top-quark production and decay. The data analysed correspond to 140 fb1fb1 of proton-proton collisions at a centre-of-mass energy of s=s=13 TeV recorded with the ATLAS detector at the Large Hadron Collider. The analysis targets events containing two muons with the same electric charge, a hadronically decaying ττ-lepton and at least one jet, with exactly one bb-tagged jet, produced by a μτqtμτqt interaction. Agreement with the Standard Model expectation within 1.6σ1.6σ is observed, and limits are set at the 95% CL on the charged-lepton-flavour violation branching ratio of B(tμτq)<8.7×107B(tμτq)<8.7×107. An Effective Field Theory interpretation is performed yielding 95% CL limits on Wilson coefficients, dependent on the flavour of the associated light quark and the Lorentz structure of the coupling. These range from |c3(2313)lequ|/Λ2<0.10 TeV2 for μτut to |c1(2323)lequ|/Λ2<1.8 TeV2 for μτct. An additional interpretation is performed for scalar leptoquark production inducing charged lepton flavour violation, with fixed inter-generational couplings. Upper limits on leptoquark coupling strengths are set at the 95% CL, ranging from λLQ=1.3 to λLQ=3.7 for leptoquark masses between 0.5 and 2.0 TeV.
Related document supersedes: ATLAS-CONF-2023-001
Copyright/License Preprint: © 2024-2025 CERN (License: CC-BY-4.0)
Publication: © 2024-2025 CERN (License: CC BY 4.0), sponsored by SCOAP³



Corresponding record in: Inspire
Email contact: tatjana.lenz@cern.ch


 Zapis kreiran 2024-03-12, zadnja izmjena 2025-01-18


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