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

A search for supersymmetric partners of top quarks decaying as ${\tilde{t}}_1\to c{\tilde{\chi }}_1^0$ and supersymmetric partners of charm quarks decaying as ${\tilde{c}}_1\to c{\tilde{\chi }}_1^0$, where ${\tilde{\chi }}_1^0$ is the lightest neutralino, is presented. The search uses 36.1 ${\mathrm{f}\mathrm{b}}^{-1}$ $pp$ 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 up to 500 GeV are excluded.