Search for a scalar partner of the top quark in the jets plus missing transverse momentum final state at $\sqrt{s}$=13 TeV with the ATLAS detector

Abstract

A search for pair production of a scalar partner of the top quark in events with four or more jets plus missing transverse momentum is presented. An analysis of 36.1 fb${}^{-1}$ of $\sqrt{s}$=13 TeV proton-proton collisions collected using the ATLAS detector at the LHC yields no significant excess over the expected Standard Model background. To interpret the results a simplified supersymmetric model is used where the top squark is assumed to decay via ${\tilde{t}}_1\to t^{(\ast )}{\tilde{\chi }}_1^0$ and ${\tilde{t}}_1\to b{\tilde{\chi }}_1^{\pm }\to b{W}^{(\ast )}{\tilde{\chi }}_1^0$, where ${\tilde{\chi }}_1^0$ (${\chi }_1^{\pm }$) denotes the lightest neutralino (chargino). Exclusion limits are placed in terms of the top-squark and neutralino masses. Assuming a branching ratio of 100% to $t{\tilde{\chi }}_1^0$, top-squark masses in the range 450-950 GeV are excluded for ${\tilde{\chi }}_1^0$ masses below 160 GeV. In the case where $m_{{\tilde{t}}_1}\sim m_t+m_{{\tilde{\chi }}_1^0}$, top-squark masses in the range 235-590 GeV are excluded.

57 pages in total, author list starts on page 40, 12 figures, 14 tables, submitted to JHEP, all figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/SUSY-2016-15

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