Speaker
Alejandro de la Puente
(TRIUMF)
Description
We study the collider signatures of a long-lived massive colored scalar transforming trivially under the weak interaction and decaying within the inner sections of a detector such as ATLAS or CMS. In our study, we assume that the colored scalar couples at tree-level to a top quark and a stable fermion, possibly arising from a dark sector or from supersymmetric extensions of the Standard Model. After implementing the latest experimental searches for long-lived colored scalars, we observe a region of parameter space consistent with a colored electroweak-singlet scalar with mass between $100-200$ GeV and a lifetime between $0.1-10$ $\text{mm}/c$ together with a nearly degenerate dark fermion that may be probed at the $\sqrt{s}=13$ TeV LHC. We show that our simplified model may naturally arise from the light-stop window regime of the Minimal Supersymmetric Standard Model, where a light mostly right-handed stop has a mass slightly larger than the lightest neutralino and decays through a four-body process.
Author
Alejandro de la Puente
(TRIUMF)
