Search for supersymmetry in final states with charm jets and missing transverse momentum in 13 TeV $pp$ collisions with the ATLAS detector
2018.
The collaboration

Abstract (data abstract)
A search for supersymmetric partners of top quarks decaying as $\tilde{t}_1\rightarrow c\tilde{\chi}_1^0$ and supersymmetric partners of charm quarks decaying as $\tilde{c}_1\rightarrow c\tilde{\chi}_1^0$, where $\tilde{\chi}_1^0$ is the lightest neutralino, is presented. The search uses 36.1 fb$^{-1}$ $pp$ collision data at a centre-of-mass energy of 13 TeV collected by the ATLAS experiment at the Large Hadron Collider and is performed in final states with jets identified as containing charm hadrons. Assuming a 100% branching ratio to $c\tilde{\chi}_1^0$, top and charm squarks with masses up to 850 GeV are excluded at 95% confidence level for a massless lightest neutralino. For $m_{\tilde{t}_1,\tilde{c}_1}-m_{\tilde{\chi}_1^0} < 100$ GeV, top and charm squark masses 1 up to 500 GeV are excluded.

Version 3 modifications: Fix an issue with the detector efficiency numbers.