Kavli Affiliate: Mihoko M. Nojiri
| First 5 Authors: Iñaki Lara, Trygve Buanes, Rafał Masełek, Mihoko M. Nojiri, Krzysztof Rolbiecki
| Summary:
We study the monojet and dijet channels at the LHC as a tool for searching
for squarks and gluinos. We consider two separate R-parity conserving
supersymmetric scenarios. In the first scenario we postulate a large mass
hierarchy between squarks ($tilde q$) and winos ($widetilde W$), and
wino-like neutralino 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 is originated
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 only a few GeV heavier than the LSP 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 and dijet analyses and
find a non-trivial exclusion limit in the squark-gluino mass plane in this
scenario.
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