Kavli Affiliate: Mihoko M. Nojiri
| First 5 Authors: Iñaki Lara, Trygve Buanes, Rafał Masełek, Mihoko M. Nojiri, Krzysztof Rolbiecki
| Summary:
In this paper, we study the monojet and dijet channels at the LHC as a tool
for searching for squarks and gluinos. We consider two separate scenarios. In
the first scenario we postulate a large mass hierarchy between the squarks
($tilde q$) and the wino ($widetilde W$), which is assumed to be the lightest
supersymmetric particle (LSP). The associated squark-wino production, $pp to
tilde q widetilde W$, then leads to a monojet-like signature, where the high
$p_T$ jet originates from the squark decay, $tilde q to q + widetilde W$. We
demonstrate that this associated production, as well as the $pp to widetilde
W widetilde W + {rm jets}$ production, have a significant impact on the
exclusion limit in the squark-neutralino mass plane. The second scenario
postulates that the lighter of the squark and gluino is almost mass degenerate
with the lightest neutralino. The associated squark-gluino production, $pp to
tilde q tilde g$, then leads to a distinctive monojet signature, where the
high $p_T$ jet is produced from the decay of the heavier coloured particle into
the lighter one ($tilde q to q + tilde g$ for $m_{tilde q} > m_{tilde g}$
and $tilde g to q + tilde q$ for $m_{tilde g} > m_{tilde q}$). The lighter
coloured particle is effectively regarded as an invisible particle since the
decay products are soft due to the approximate mass degeneracy. We recast
existing monojet-type analyses and find a non-trivial exclusion limit in the
squark-gluino mass plane in this scenario.
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