Search for nearly mass-degenerate higgsinos using low-momentum mildly-displaced tracks in pp collisions at √(s) = 13 TeV with the ATLAS detector
arxiv(2024)
摘要
Higgsinos with masses near the electroweak scale can solve the hierarchy
problem and provide a dark matter candidate, while detecting them at the LHC
remains challenging if their mass-splitting is 𝒪(1 GeV). This
Letter presents a novel search for nearly mass-degenerate higgsinos in events
with an energetic jet, missing transverse momentum, and a low-momentum track
with a significant transverse impact parameter using 140 fb^-1 of
proton-proton collision data at √(s) = 13 TeV collected by the ATLAS
experiment. For the first time since LEP, a range of mass-splittings between
the lightest charged and neutral higgsinos from 0.3 GeV to 0.9 GeV is excluded
at 95
higgsino mass.
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