Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Second Stop and Sbottom Searches with a Stealth Stop   The top squarks (stops) may be the most wanted particles after the Higgs
boson discovery. The searches for the lightest stop have put strong constraints
on its mass. However, there is still a search gap in the low mass region if the
spectrum of the stop and the lightest neutralino is compressed. In that case,
it may be easier to look for the second stop since naturalness requires both
stops to be close to the weak scale. The current experimental searches for the
second stop are based on the simplified model approach with the decay modes
$\tilde{t}_2 \to \tilde{t}_1 Z$ and $\tilde{t}_2 \to \tilde{t}_1 h$. However,
in a realistic supersymmetric spectrum there is always a sbottom lighter than
the second stop, hence the decay patterns are usually more complicated than the
simplified model assumptions. In particular, there are often large branching
ratios of the decays $\tilde{t}_2 \to \tilde{b}_1 W$ and $\tilde{b}_1 \to
\tilde{t}_1 W$ as long as they are open. The decay chains can be even more
complex if there are intermediate states of additional charginos and
neutralinos in the decays. By studying several MSSM benchmark models at the 14
TeV LHC, we point out the importance of the multi-$W$ final states in the
second stop and the sbottom searches, such as the same-sign dilepton and
multilepton signals, aside from the traditional search modes. The observed
same-sign dilepton excesses at LHC Run 1 and Run 2 may be explained by some of
our benchmark models. We also suggest that the vector boson tagging and a new
kinematic variable may help to suppress the backgrounds and increase the signal
significance for some search channels. Due to the complex decay patterns and
lack of the dominant decay channels, the best reaches likely require a
combination of various search channels at the LHC for the second stop and the
lightest sbottom.

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The categories of this paper are: solv-int
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The categories of this paper are: gr-qc
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The categories of this paper are: hep-lat
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The categories of this paper are: acc-phys
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The categories of this paper are: nucl-th
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The categories of this paper are: math
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The categories of this paper are: cs
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The categories of this paper are: ao-sci
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The categories of this paper are: quant-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: dg-ga
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The categories of this paper are: hep-th
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The categories of this paper are: nlin
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The categories of this paper are: mtrl-th
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The categories of this paper are: patt-sol
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The categories of this paper are: plasm-ph