Searches for anomalous $tqZ$ couplings from the trilepton signal of $tZ$ associated production at the 14 TeV LHC

Abstract

We investigate the observability of the top anomalous $tqZ$ couplings via the trilepton signatures at the Large Hadron Collider~(LHC) with the center-of-mass energy of 14 TeV. We focus on signals of the $tZ$ associated production with the decay mode $t\to W^{+}b\to b{\ell }^{+}{\nu }_{\ell }$, $Z\to {\ell }^{+}{\ell }^{-}$, and $t\bar{t}$ production with the decay mode $\bar{t}\to Z(\to {\ell }^{+}{\ell }^{-})\bar{q}$ and $t\to b{\ell }^{+}{\nu }_{\ell }$, where $\ell =e,\mu$ and $q$ reflects up and charm quarks. It is shown that at $3\sigma$ level, the FCNC top quark decay branching ratios can be probed at, respectively, about $Br(t\to uZ)\le 1.3\times 10^{-4}$ and $Br(t\to cZ)\le 4.2\times 10^{-4}$ with the integrated luminosity of 100 fb${}^{-1}$, and probed down to $Br(t\to uZ)\le 2.2\times 10^{-5}$ and $Br(t\to cZ)\le 8\times 10^{-5}$ for the high-luminosity LHC with 3000 fb${}^{-1}$.

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