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| CMS-PAS-TOP-22-011 | ||
| Search for lepton flavour violation in top quark interactions with an up-type quark, a muon, and a $ \tau $ lepton | ||
| CMS Collaboration | ||
| 5 August 2024 | ||
| Abstract: We present a search for charged-lepton flavour violation (CLFV) in the top quark (t) sector using 138 fb$ ^{-1} $ of proton-proton collision data collected with the CMS experiment at a centre-of-mass energy of 13 TeV. The analysis focuses on events containing a single muon ($ \mu $) and a hadronically decaying $ \tau $ lepton. Machine learning multiclass classification techniques are used to distinguish signal from standard model background events. The CLFV 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 results of this search are consistent with the standard model expectations. The upper limits at 95% confidence level on the branching fraction $ \mathcal{B} $ for CLFV top quark decays to an up (u) or a charm (c) quark, a muon and a $ \tau $ lepton are $ \mathcal{B}(\mathrm{t} \to \mu\tau\mathrm{u}) < $ 0.04, 0.078, and 0.118 $ \times$ 10$^{-6} $, and $ \mathcal{B}(\mathrm{t} \to \mu\tau\mathrm{c}) < $ 0.81, 1.71, and 2.05 $ \times$ 10$^{-6} $ for scalar, vector, and tensor-like operators, respectively. | ||
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Links:
CDS record (PDF) ;
CADI line (restricted) ;
These preliminary results are superseded in this paper, Submitted to JHEP. The superseded preliminary plots can be found here. |
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Compact Muon Solenoid LHC, CERN |
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