A search for long-lived, massive particles predicted by many theories beyond the Standard Model is presented. The search targets final states with large missing transverse momentum and at least one high-mass displaced vertex with five or more tracks, and uses $32.8{\mathrm{fb}}^{-1}$ of $\sqrt{s}=13\mathrm{TeV}$ $pp$ collision data collected by the ATLAS detector at the LHC. The observed yield is consistent with the expected background. The results are used to extract 95% C.L. exclusion limits on the production of long-lived gluinos with masses up to 2.37 TeV and lifetimes of $\mathcal{O}({10}^{-2})-\mathcal{O}(10)\mathrm{ns}$ in a simplified model inspired by split supersymmetry.

• Received 13 October 2017

DOI:https://doi.org/10.1103/PhysRevD.97.052012

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© 2018 CERN, for the ATLAS Collaboration