jats:titleAjats:scbstract</jats:sc> </jats:title>jats:pSearches for electroweak production of wino-like chargino pairs, jats:inline-formulajats:alternativesjats:tex-math$$ {\overset{\sim }{\chi}}_1^{+}{\overset{\sim }{\chi}}_1^{-} $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> mml:msubsup mml:mover mml:miχ</mml:mi> mml:mo~</mml:mo> </mml:mover> mml:mn1</mml:mn> mml:mo+</mml:mo> </mml:msubsup> mml:msubsup mml:mover mml:miχ</mml:mi> mml:mo~</mml:mo> </mml:mover> mml:mn1</mml:mn> mml:mo−</mml:mo> </mml:msubsup> </mml:math></jats:alternatives></jats:inline-formula>, and of wino-like chargino and next-to-lightest neutralino, jats:inline-formulajats:alternativesjats:tex-math$$ {\overset{\sim }{\chi}}_1^{\pm }{\overset{\sim }{\chi}}_2^0 $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> mml:msubsup mml:mover mml:miχ</mml:mi> mml:mo~</mml:mo> </mml:mover> mml:mn1</mml:mn> mml:mo±</mml:mo> </mml:msubsup> mml:msubsup mml:mover mml:miχ</mml:mi> mml:mo~</mml:mo> </mml:mover> mml:mn2</mml:mn> mml:mn0</mml:mn> </mml:msubsup> </mml:math></jats:alternatives></jats:inline-formula>, are presented. The models explored assume that the charginos decay into a jats:italicW</jats:italic> boson and the lightest neutralino, jats:inline-formulajats:alternativesjats:tex-math$$ {\overset{\sim }{\chi}}_1^{\pm}\to {W}^{\pm }{\overset{\sim }{\chi}}_1^0 $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> mml:msubsup mml:mover mml:miχ</mml:mi> mml:mo~</mml:mo> </mml:mover> mml:mn1</mml:mn> mml:mo±</mml:mo> </mml:msubsup> mml:mo→</mml:mo> mml:msup mml:miW</mml:mi> mml:mo±</mml:mo> </mml:msup> mml:msubsup mml:mover mml:miχ</mml:mi> mml:mo~</mml:mo> </mml:mover> mml:mn1</mml:mn> mml:mn0</mml:mn> </mml:msubsup> </mml:math></jats:alternatives></jats:inline-formula>. The next-to-lightest neutralinos are degenerate in mass with the chargino and decay to jats:inline-formulajats:alternativesjats:tex-math$$ {\overset{\sim }{\chi}}_1^0 $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> mml:msubsup mml:mover mml:miχ</mml:mi> mml:mo~</mml:mo> </mml:mover> mml:mn1</mml:mn> mml:mn0</mml:mn> </mml:msubsup> </mml:math></jats:alternatives></jats:inline-formula> and either a jats:italicZ</jats:italic> or a Higgs boson, jats:inline-formulajats:alternativesjats:tex-math$$ {\overset{\sim }{\chi}}_2^0\to Z{\overset{\sim }{\chi}}_1^0 $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> mml:msubsup mml:mover mml:miχ</mml:mi> mml:mo~</mml:mo> </mml:mover> mml:mn2</mml:mn> mml:mn0</mml:mn> </mml:msubsup> mml:mo→</mml:mo> mml:miZ</mml:mi> mml:msubsup mml:mover mml:miχ</mml:mi> mml:mo~</mml:mo> </mml:mover> mml:mn1</mml:mn> mml:mn0</mml:mn> </mml:msubsup> </mml:math></jats:alternatives></jats:inline-formula> or jats:inline-formulajats:alternativesjats:tex-math$$ h{\overset{\sim }{\chi}}_1^0 $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> mml:mih</mml:mi> mml:msubsup mml:mover mml:miχ</mml:mi> mml:mo~</mml:mo> </mml:mover> mml:mn1</mml:mn> mml:mn0</mml:mn> </mml:msubsup> </mml:math></jats:alternatives></jats:inline-formula>. The searches exploit the presence of a single isolated lepton and missing transverse momentum from the jats:italicW</jats:italic> boson decay products and the lightest neutralinos, and the presence of jets from hadronically decaying jats:italicZ</jats:italic> or jats:italicW</jats:italic> bosons or from the Higgs boson decaying into a pair of jats:italicb</jats:italic>-quarks. The searches use 139 fbjats:supjats:italic−</jats:italic>1</jats:sup> of jats:inline-formulajats:alternativesjats:tex-math$$ \sqrt{s} $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> mml:msqrt mml:mis</mml:mi> </mml:msqrt> </mml:math></jats:alternatives></jats:inline-formula> = 13 TeV proton-proton collisions data collected by the ATLAS detector at the Large Hadron Collider between 2015 and 2018. No deviations from the Standard Model expectations are found, and 95% confidence level exclusion limits are set. Chargino masses ranging from 260 to 520 GeV are excluded for a massless jats:inline-formulajats:alternativesjats:tex-math$$ {\overset{\sim }{\chi}}_1^0 $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> mml:msubsup mml:mover mml:miχ</mml:mi> mml:mo~</mml:mo> </mml:mover> mml:mn1</mml:mn> mml:mn0</mml:mn> </mml:msubsup> </mml:math></jats:alternatives></jats:inline-formula> in chargino pair production models. Degenerate chargino and next-to-lightest neutralino masses ranging from 260 to 420 GeV are excluded for a massless jats:inline-formulajats:alternativesjats:tex-math$$ {\overset{\sim }{\chi}}_1^0 $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> mml:msubsup mml:mover mml:miχ</mml:mi> mml:mo~</mml:mo> </mml:mover> mml:mn1</mml:mn> mml:mn0</mml:mn> </mml:msubsup> </mml:math></jats:alternatives></jats:inline-formula> for jats:inline-formulajats:alternativesjats:tex-math$$ {\overset{\sim }{\chi}}_2^0\to Z{\overset{\sim }{\chi}}_1^0 $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> mml:msubsup mml:mover mml:miχ</mml:mi> mml:mo~</mml:mo> </mml:mover> mml:mn2</mml:mn> mml:mn0</mml:mn> </mml:msubsup> mml:mo→</mml:mo> mml:miZ</mml:mi> mml:msubsup mml:mover mml:miχ</mml:mi> mml:mo~</mml:mo> </mml:mover> mml:mn1</mml:mn> mml:mn0</mml:mn> </mml:msubsup> </mml:math></jats:alternatives></jats:inline-formula>. For decays through an on-shell Higgs boson and for mass-splitting between jats:inline-formulajats:alternativesjats:tex-math$$ {\overset{\sim }{\chi}}_1^{\pm }/{\overset{\sim }{\chi}}_2^0 $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> mml:msubsup mml:mover mml:miχ</mml:mi> mml:mo~</mml:mo> </mml:mover> mml:mn1</mml:mn> mml:mo±</mml:mo> </mml:msubsup> mml:mo/</mml:mo> mml:msubsup mml:mover mml:miχ</mml:mi> mml:mo~</mml:mo> </mml:mover> mml:mn2</mml:mn> mml:mn0</mml:mn> </mml:msubsup> </mml:math></jats:alternatives></jats:inline-formula> and jats:inline-formulajats:alternativesjats:tex-math$$ {\overset{\sim }{\chi}}_1^0 $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> mml:msubsup mml:mover mml:miχ</mml:mi> mml:mo~</mml:mo> </mml:mover> mml:mn1</mml:mn> mml:mn0</mml:mn> </mml:msubsup> </mml:math></jats:alternatives></jats:inline-formula> as small as the Higgs boson mass, mass limits are improved by up to 40 GeV in the range of 200–260 GeV and 280–470 GeV compared to previous ATLAS constraints.</jats:p>