Abstract
The results of a search for electroweakino pair production pp rightarrow tilde{chi }^pm _1 tilde{chi }^0_2 in which the chargino (tilde{chi }^pm _1) decays into a W boson and the lightest neutralino (tilde{chi }^0_1), while the heavier neutralino (tilde{chi }^0_2) decays into the Standard Model 125 GeV Higgs boson and a second tilde{chi }^0_1 are presented. The signal selection requires a pair of b-tagged jets consistent with those from a Higgs boson decay, and either an electron or a muon from the W boson decay, together with missing transverse momentum from the corresponding neutrino and the stable neutralinos. The analysis is based on data corresponding to 139 mathrm {fb}^{-1} of sqrt{s}=13 TeV pp collisions provided by the Large Hadron Collider and recorded by the ATLAS detector. No statistically significant evidence of an excess of events above the Standard Model expectation is found. Limits are set on the direct production of the electroweakinos in simplified models, assuming pure wino cross-sections. Masses of tilde{chi }^{pm }_{1}/tilde{chi }^{0}_{2} up to 740 GeV are excluded at 95% confidence level for a massless tilde{chi }^{0}_{1}.
Highlights
The Standard Model (SM) is a remarkably successful theory, yet it is clear that this theory is not a complete description of nature
Limits are set on the direct production of the electroweakinos in simplified models, assuming pure wino cross-sections
Masses of χ1±/χ20 up to 740 GeV are excluded at 95% confidence level for a massless χ10
Summary
The Standard Model (SM) is a remarkably successful theory, yet it is clear that this theory is not a complete description of nature. The lightest chargino and next-to-lightest neutralino can decay via χ1± → W χ10 and χ20 → h/Z χ10 respectively [20,21,22] in scenarios where the lepton superpartners are heavier than the electroweakinos In this case the decay via the Higgs boson is dominant for many choices of SUSY parameters, as long as m(χ20) − m(χ10) > m(h). This paper presents a search for direct production of electroweakinos√in the LHC at s proton–proton ( pp) collisions produced = 13 TeV This analysis is designed to at be sensitive to direct production of a chargino and a neutralino that promptly decay as χ1± → W χ10 and χ20 → hχ. Because of increased integrated luminosity and an improved twodimensional fit procedure, the search presented here significantly extends the SUSY parameter space sensitivity beyond that of the previously published 13 TeVATLAS search [25] for the same final state
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