Search for charged-lepton flavour violation in top quark interactions with an up-type quark, a muon, and a τ lepton in proton-proton collisions at √s = 13 TeV
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13130_2025_Article_27767.pdf
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Author(s)
Hayrapetyan, A.
Tumasyan, A.
Adam, W.
Andrejkovic, J. W.
Benato, L.
Bergauer, T.
Chatterjee, S.
Damanakis, K.
Dragicevic, M.
Hussain, P. S.
Date Issued
December 10, 2025
Journal
Journal of High Energy Physics
Publisher
Springer Berlin Heidelberg
Citation
The CMS collaboration., Hayrapetyan, A., Tumasyan, A. et al. Search for charged-lepton flavour violation in top quark interactions with an up-type quark, a muon, and a τ lepton in proton-proton collisions at √s = 13 TeV. J. High Energ. Phys. 2025, 65 (2025).
Version
Final published version
Abstract
A search for charged-lepton flavour violation (CLFV) in top quark (t) production
and decay is presented. The search uses proton-proton collision data corresponding to 138 fb−1
collected with the CMS experiment at √
s = 13 TeV. The signal consists of the production
of a single top quark via a CLFV interaction or top quark pair production followed by a
CLFV decay. The analysis selects events containing a hadronically decaying τ lepton and
a muon of opposite electric charge, as well as at least three jets, one of which is identified
as originating from the fragmentation of a bottom quark. Machine learning classification
techniques are used to distinguish signal from standard model background events. The results
of this search are consistent with the standard model expectations. The upper limits at 95%
confidence level on the branching fraction B for CLFV top quark decays to a muon, a τ
lepton, and an up or a charm quark are set at B(t → µτu) < (0.04, 0.08, and 0.12) × 10−6
,
and B(t → µτ c) < (0.81, 1.71, and 2.05) × 10−6
for scalar, vector, and tensor-like operators,
respectively.
MIT Department
Massachusetts Institute of Technology. Laboratory for Nuclear Science
Massachusetts Institute of Technology. Department of Brain and Cognitive Sciences
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1007/JHEP12(2025)065
