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CMS-SUS-13-014 ; CERN-PH-EP-2013-226
Search for stop and higgsino production using diphoton Higgs boson decays
Phys. Rev. Lett. 112 (2014) 161802
Abstract: Results are presented of a search for a "natural" supersymmetry scenario with gauge mediated symmetry breaking. It is assumed that only the supersymmetric partners of the top-quark (stop) and the Higgs boson (higgsino) are accessible. Events are examined in which there are two photons forming a Higgs boson candidate, and at least two b-quark jets. In 19.7 inverse femtobarns of proton-proton collision data at $\sqrt{s}$ = 8 TeV, recorded in the CMS experiment, no evidence of a signal is found and lower limits at the 95% confidence level are set, excluding the stop mass below 360 to 410 GeV, depending on the higgsino mass.
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Figures

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Figure 1-a:
Example Feynman diagram of strong (a) and electroweak (b) higgsino production. The jets or leptons resulting from transitions between higgsinos are extremely soft in both diagrams due to the near mass degeneracy among the higgsinos.

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Figure 1-b:
Example Feynman diagram of strong (a) and electroweak (b) higgsino production. The jets or leptons resulting from transitions between higgsinos are extremely soft in both diagrams due to the near mass degeneracy among the higgsinos.

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Compact Muon Solenoid
LHC, CERN