TY - JOUR
T1 - 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
AU - ATLAS Collaboration
AU - Allport, Phil
AU - Auriol, Adrien
AU - Bellos, Panagiotis
AU - Bracinik, Juraj
AU - Charlton, David
AU - Chisholm, Andrew
AU - Cooke, Harry
AU - Dimitrievska, Aleksandra
AU - George, Will
AU - Gonella, Laura
AU - Gonnella, Francesco
AU - Hawkes, Chris
AU - Hillier, Stephen
AU - Krizka, Karol
AU - Liu, Eric
AU - Lomas, Josh
AU - Marinescu, Mihaela
AU - Neep, Thomas
AU - Newman, Paul
AU - Nikolopoulos, Konstantinos
AU - Skorda, Eleni
AU - Stampekis, Alexis
AU - Thomas, Jurgen
AU - Thompson, Paul
AU - Virdee, Gov
AU - Ward, Robert
AU - Watson, Alan
AU - Watson, Miriam
AU - Wu, C.
PY - 2024/7/25
Y1 - 2024/7/25
N2 - 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.
AB - 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.
UR - https://journals.aps.org/prd/accepted/8b07fQ3bD7f1e33c93cc5fa3d77a1dd98a1407bfc
U2 - 10.1103/PhysRevD.110.012014
DO - 10.1103/PhysRevD.110.012014
M3 - Article
SN - 1550-7998
VL - 110
JO - Physical Review D - Particles, Fields, Gravitation and Cosmology
JF - Physical Review D - Particles, Fields, Gravitation and Cosmology
M1 - 012014
ER -