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Searches for electroweak production of chargino pairs,$\tilde{\chi}^{+}_{1}\tilde{\chi}^{-}_{1}$, and of chargino andnext-to-lightest neutralino, $\tilde{\chi}^{\pm}_{1}\tilde{\chi}^{0}_{2}$, arepresented. The models explored assume that the charginos decay into a $W$ bosonand the lightest neutralino, $\tilde{\chi}^{\pm}_1 \rightarrow W^{\pm}\tilde{\chi}^{0}_{1}$. The next-to-lightest neutralinos are degenerate in masswith the chargino and decay to $\tilde{\chi}^{0}_{1}$ and either a $Z$ or aHiggs boson, $\tilde{\chi}^{0}_{2} \rightarrow Z \tilde{\chi}^{0}_{1}$ or $h\tilde{\chi}^{0}_{1}$. The searches exploit the presence of a single isolatedlepton and missing transverse momentum from the $W$ boson decay products andthe lightest neutralinos, and the presence of jets from hadronically decaying$Z$ or $W$ bosons or from the Higgs boson decaying into a pair of $b$-quarks.The searches use 139 fb$^{-1}$ of $\sqrt{s}= 13$ TeV proton-proton collisionsdata collected by the ATLAS detector at the Large Hadron Collider between 2015and 2018. No deviations from the Standard Model expectations are found, and 95%confidence level exclusion limits are set. Chargino masses ranging from 260 to520 GeV are excluded for a massless $\tilde{\chi}^{0}_{1}$ in chargino pairproduction models. Degenerate chargino and next-to-lightest neutralino massesranging from 260 to 420 GeV are excluded for a massless $\tilde{\chi}^{0}_{1}$for $\tilde{\chi}^{0}_{2} \rightarrow Z \tilde{\chi}^{0}_{1}$. For decaysthrough an on-shell Higgs boson and for mass-splitting between$\tilde{\chi}^{\pm}_{1} / \tilde{\chi}^{0}_{2}$ and $\tilde{\chi}^{0}_{1}$ assmall as the Higgs boson mass, mass limits are improved by up to 40 GeV in therange of 200-260 GeV and 280-470 GeV compared to previous ATLAS constraints.

Search for direct production of electroweakinos in final states with one  lepton, jets and missing transverse momentum in pp collisions at  $\sqrt{s}=13$ TeV with the ATLAS detector