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

Allbrooke, Benedict, Asquith, Lily, Cerri, Alessandro, DeSanto, Antonella, Salvatore, Fabrizio, Suruliz, Kerim, Sutton, Mark, Vivarelli, Iacopo and The ATLAS Collaboration, (2017) 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. Journal of High Energy Physics, 2017 (85). ISSN 1126-6708

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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 t̃ 1→t(∗)χ̃ 01 and t̃ 1→bχ̃ ±1→bW(∗)χ̃ 01, where χ̃ 01 (χ±1) 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 tχ̃ 01, top-squark masses in the range 450--950 GeV are excluded for χ̃ 01 masses below 160 GeV. In the case where mt̃ 1∼mt+mχ̃ 01, top-squark masses in the range 235--590 GeV are excluded.

Item Type: Article
Keywords: LHC, ATLAS, supersymmetry, stop
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Subjects: Q Science > QC Physics > QC0770 Nuclear and particle physics. Atomic energy. Radioactivity > QC0793 Elementary particle physics
Depositing User: Iacopo Vivarelli
Date Deposited: 18 Dec 2017 09:58
Last Modified: 06 Jun 2018 13:52
URI: http://sro.sussex.ac.uk/id/eprint/72226

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