  The presence of two light higgsinos nearly degenerate in mass is one of the
important characteristics of suspersymmetric models meeting the naturalness
criteria. Probing such higgsinos at the LHC is very challenging, in particular
when the mass-splitting between them is less than 5 GeV. In this study, we
analyze such a degenerate higgsino scenario by exploiting the high collinearity
between the two muons which originate from the decay of the heavier higgsino
into the lighter one and which are accompanied by a high-$p_T$ QCD jet. Using
our method, we can achieve a statistical significance $\sim 2.9\,\sigma$ as
well as a $S/B \sim 17\%$ with an integrated luminosity of 3000 fb$^{-1}$ at
the 14 TeV LHC, for the pair production of higgsinos with masses 124 GeV and
120 GeV. A good sensitivity can be achieved even for a smaller mass-splitting
when the higgsinos are lighter.
