Consistent Excesses in the Search for χ̃_2^ 0χ̃_1^± : Wino/bino vs. Higgsino Dark Matter
arxiv(2024)
Abstract
The quest for supersymmetric (SUSY) particles is among the main search
channels currently pursued at the LHC. Particularly, electroweak (EW) particles
with masses as low as a few hundred GeV are still viable. Recent searches for
the “golden channel”, pp →χ̃_2^ 0χ̃_1^±→χ̃_1^ 0 Z^(*) χ̃_1^ 0 W^± (*) show
consistent excesses between ATLAS and CMS in the 2 lepton, 3-lepton and
mono-jet searches, assuming m_χ̃_2^ 0≈ m_χ̃_1^±≳ 200 GeV and Δ m := m_χ̃_2^ 0 -
m_χ̃_1^ 0≈ 20 GeV. This mass configuration arises
naturally in SUSY scenarios with wino/bino Dark Matter (DM) or higgsino DM. In
these scenarios the lightest supersymmetric particle (LSP), assumed to be the
lightest neutralino, as a DM candidate, is in good agreement with the observed
limits on the DM content of the universe, as well as with negative results from
Direct Detection (DD) experiments. We analyze these two scenarios with respect
to the observed excesses, taking into account all relevant experimental
constraints. We show that in particular wino/bino DM with different signs of
the SU(2) and U(1) soft SUSY-breaking parameters can describe well the
experimental excesses, while being in agreement with all other constraints.
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