Speaker
Haipeng An
(Tsinghua University)
Description
Light top quark superpartners are the key ingredients for supersymmetric models to solve the electroweak hierarchy problem. The compressed region of the parameter space that $m_{\tilde t_1} \approx m_{\chi^0_1}$ is notoriously difficult to search. In this region, if the LSP neutralino is pure bino, $\tilde t_1$ can be long-lived, which produces displaced vertices in detectors. We propose to use the monojet trigger plus the analysis of displaced vertices to cover this region. We apply this method to the 8 TeV CMS Open Data with a luminosity of 11.6~fb$^{-1}$, and find that using this method the $2\sigma$ limit of $m_{\tilde t}$ in the region $m_{\tilde t} - m_{\chi^0} \approx 15-30$ GeV is about $m_{\tilde t} > 350$ GeV.
Authors
Haipeng An
(Tsinghua University)
Zhen Hu
(Tsinghua University (CN))
Zhen Liu
(U of Maryland)
Daneng Yang
(Department of Physics, Tsinghua University (CN))
