Search for charged-lepton flavor violation in top quark production and decay in pp collisions at $\sqrt{s}$ = 13 TeV

The CMS collaboration
JHEP 06 (2022) 082, 2022.

Abstract
Results are presented from a search for charged-lepton flavor violating (CLFV) interactions in top quark production and decay in pp collisions at a center-of-mass energy of 13 TeV. The events are required to contain one 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 138 fb$^{-1}$, collected by the CMS experiment at the LHC. This analysis includes both the production (q $\to$ e$\mu$t) and decay (t $\to$ e$\mu$q) modes of the top quark through CLFV interactions, with q referring to a u or c quark. These interactions are parametrized using an effective field theory approach. With no significant excess over the standard model expectation, the results are interpreted in terms of vector-, scalar-, and tensor-like CLFV four-fermion effective interactions. Finally, observed exclusion limits are set at 95% confidence levels on the respective branching fractions of a top quark to an e$\mu$ pair and an up (charm) quark of 0.13 $\times$ 10$^{-6}$ (1.31 $\times$ 10$^{-6}$), 0.07 $\times$ 10$^{-6}$ (0.89 $\times$ 10$^{-6}$), and 0.25 $\times$ 10$^{-6}$ (2.59 $\times$ 10$^{-6}$) for vector, scalar, and tensor CLFV interactions, respectively.

  • Table 3.1

    Values from Table 3.

    10.17182/hepdata.106000.v1/t1

    The expected and observed upper limits on the signal cross sections.

  • Table 3.2

    Values from Table 3.

    10.17182/hepdata.106000.v1/t2

    The expected and observed upper limits on CLFV Wilson coefficients. The Limits on the Wilson coefficients are extracted from the...

  • Table 3.3

    Values from Table 3

    10.17182/hepdata.106000.v1/t3

    The expected and observed upper limits on top quark CLFV branching fractions. The Limits on the top quark CLFV branching...

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