Abstract
A search is presented for the direct pair production of a chargino and a neutralino pprightarrow tilde{chi }_1^pm tilde{chi }_2^0, where the chargino decays to the lightest neutralino and the W boson, tilde{chi }_1^pm rightarrow tilde{chi }_1^0(W^{pm }rightarrow ell ^{pm }nu ), while the neutralino decays to the lightest neutralino and the 125 GeV Higgs boson, tilde{chi }_2^0rightarrow tilde{chi }_1^0(hrightarrow bb/gamma gamma /ell ^{pm }nu qq). The final states considered for the search have large missing transverse momentum, an isolated electron or muon, and one of the following: either two jets identified as originating from bottom quarks, or two photons, or a second electron or muon with the same electric charge. The analysis is based on 20.3 mathrm {fb}^{-1} of sqrt{s}=8{mathrm { TeV}} proton–proton collision data delivered by the Large Hadron Collider and recorded with the ATLAS detector. Observations are consistent with the Standard Model expectations, and limits are set in the context of a simplified supersymmetric model.
Highlights
In SUSY scenarios where the masses of the pseudoscalar Higgs boson and the superpartners of the leptons are larger than those of the produced chargino and neutralino, the chargino decays to the lightest neutralino and the W boson, while the next-to-lightest neutralino decays to the lightest neutralino and the Standard Model (SM)-like Higgs or Z boson
Observations are consistent with the Standard Model expectations, and limits are set in the context of a simplified supersymmetric model
This paper focuses on SUSY scenarios where the decay to the Higgs boson is the dominant one
Summary
In SUSY scenarios where the masses of the pseudoscalar Higgs boson and the superpartners of the leptons are larger than those of the produced chargino and neutralino, the chargino decays to the lightest neutralino and the W boson, while the next-to-lightest neutralino decays to the lightest neutralino and the SM-like Higgs or Z boson. This paper focuses on SUSY scenarios where the decay to the Higgs boson is the dominant one. The Higgs boson mass is set to 125 GeV, which is consistent with the measured value [20], and its branching fractions are assumed to be the same as in the SM The latter assumption is motivated by those SUSY models in which the mass of the pseudoscalar Higgs boson is much larger than the Z boson mass. The results of this paper are combined with those of the ATLAS search using the three-lepton and missing transverse momentum final state, performed with the same dataset [21].
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