Аннотация
Light top squarks (stops) and light higgsinos are the key features of natural
SUSY, where the higgsinos $\chi^\pm_1$ and $\chi^0_1,2$
are nearly degenerate and act as the missing transverse energy ($E^miss_T$)
at the LHC. Besides the strong production, the stop can be produced via the
electroweak interaction. The determination of the electroweak properties of the
stop is an essential task for the LHC and future colliders. So in this paper,
we investigate the single stop ($t_1$) production $pp t_1+
E^miss_T$ in the natural SUSY at the LHC, which gives the monotop signature
$t+ E^miss_T$ from $t_1t \chi^0_1,2$ or the monobottom
signature $b+ E^miss_T$ from $t_1 b \chi^+_1$. We
perform Monte Carlo simulations for these signatures and obtain the results:
(1) The signal $b+ E^miss_T$ has a better sensitivity than $t+ E^miss_T$
for probing natural SUSY; (2) The parameter region with a higgsino mass 100
GeV$łesssim$ 225 GeV and stop mass $m_t_1 łesssim$ 620
GeV, can be probed through the single stop production with $S/B > 3$ and
$4\% S/B łesssim19\%$ at 14 TeV HL-LHC with an integrated luminosity
of 3000 fb$^-1$.
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