Search for charged-lepton-flavour violating μτqt interactions in top-quark production and decay in pp collisions at √s = 13 TeV with the ATLAS detector at the LHC

ATLAS Collaboration, Phil Allport, Adrien Auriol, Panagiotis Bellos, Juraj Bracinik, David Charlton, Andrew Chisholm, Harry Cooke, Aleksandra Dimitrievska, Will George, Laura Gonella, Francesco Gonnella, Chris Hawkes, Stephen Hillier, Karol Krizka, Eric Liu, Josh Lomas, Mihaela Marinescu, Thomas Neep, Paul NewmanKonstantinos Nikolopoulos, Eleni Skorda, Alexis Stampekis, Jurgen Thomas, Paul Thompson, Gov Virdee, Robert Ward, Alan Watson, Miriam Watson, C. Wu

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Abstract

A search for charged-lepton-flavour violating μτqt (q=u,c) interactions is presented, considering both top-quark production and decay. The data analysed correspond to 140 fb−1 of proton-proton collisions at a centre-of-mass energy of √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 τ-lepton and at least one jet, with exactly one b-tagged jet, produced by a μτqt interaction. Agreement with the Standard Model expectation within 1.6σ is observed, and limits are set at the 95% CL on the charged-lepton-flavour violation branching ratio of B(t→μτq)<8.7×10−7. 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 TeV−2 for μτut to |c1(2323)lequ|/Λ2<1.8 TeV−2 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.
Original languageEnglish
Article number012014
Number of pages35
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume110
DOIs
Publication statusPublished - 25 Jul 2024

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