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| CMS-PAS-TOP-19-006 | ||
| Search for charged lepton flavor violation in top quark production and decay in proton-proton collisions at $\sqrt{s}= $ 13 TeV | ||
| CMS Collaboration | ||
| June 2021 | ||
| Abstract: The result of a search for charged lepton flavor violation (CLFV) through top quark production and decay in proton-proton collisions at a center-of-mass energy of 13 TeV is presented. The search is performed in events with an oppositely charged electron-muon pair in the final state along with at least one jet identified as originating from a bottom quark. The data correspond to an integrated luminosity of 137 fb$^{-1}$, collected by the CMS experiment at the CERN LHC in 2016-2018. The CLFV interactions of top quarks are parametrized using an effective field theory (EFT) approach. In this analysis, we emphasize the importance of single top quark production via CLFV interactions, in addition to the $ \mathrm{t}\rightarrow \mathrm{e}\mu \mathrm{q}$ (q = u, c) decays. No significant excess over the standard model expectation is observed. The results are interpreted in terms of scalar-, vector- and tensor-like CLFV four-fermion EFT interactions. Exclusion limits at 95% confidence level on the branching fractions of a top quark decaying to an e$\mu$ pair and an up (a charm) quark are found to be 0.12 $\times$ 10$^{-6}$ (1.59 $\times$ 10$^{-6}$), 0.24 $\times$ 10$^{-6}$ (2.55 $\times $ 10$^{-6}$), 0.46 $\times$ 10$^{-6}$ (4.62 $\times $ 10$^{-6}$) for the scalar, vector and tensor CLFV interaction types, respectively. | ||
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Links:
CDS record (PDF) ;
inSPIRE record ;
Physics Briefing ;
CADI line (restricted) ;
These preliminary results are superseded in this paper, JHEP 06 (2022) 082. The superseded preliminary plots can be found here. |
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Compact Muon Solenoid LHC, CERN |
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