PoS - Proceedings of Science
Volume 314 - The European Physical Society Conference on High Energy Physics (EPS-HEP2017) - Higgs and New Physics (Poster Session). Scientific Secretary: Luciano Canton.
Searches for direct top squark pair production in compressed Supersymmetry scenarios with the ATLAS detector
S.D. Jones*  on behalf of the ATLAS Collaboration
Full text: pdf
Pre-published on: February 03, 2018
Published on: March 20, 2018
Abstract
If Supersymmetry is to stabilise the Higgs boson mass, naturalness arguments suggest the mass of the scalar partner of the top quark (the stop) to be below around 1 TeV. The decay of the stop depends in part on the mass difference $\Delta m = m_{\tilde{t}}-m_{\tilde{\chi}^0_1}$ between the stop and the lightest neutralino, assumed to be stable. For $\Delta m < m_W + m_b$ the process $\tilde{t}\rightarrow c+\tilde{\chi}^0_1$ may dominate. This contribution presents a summary of stop searches targeting this region of parameter space. Conducted using a newly developed tagger for the identification of charm quarks, and using 36.5 fb$^{-1}$ of proton-proton collisions collected by the ATLAS detector at a centre-of-mass energy of $\sqrt{s}=13$ TeV, these searches significantly extend the exclusion limits in the $(m_{\tilde{\chi}^0_1}, m_{\tilde{t}})$ parameter space made by ATLAS during Run 1 of the LHC.
DOI: https://doi.org/10.22323/1.314.0704
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