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

Allbrooke, B M M, Asquith, L, Cerri, A, Chavez Barajas, C A, De Santo, A, Salvatore, F, Santoyo Castillo, I, Suruliz, K, Sutton, M R, Vivarelli, I and The ATLAS Collaboration, et al. (2017) Search for a scalar partner of the top quark in the jets plus missing transverse momentum final state at √s=13 TeV with the ATLAS detector. Journal of High Energy Physics. ISSN 1126-6708 (Accepted)

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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 √ 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 t˜1 → t (∗)χ˜ 0 1 and t˜1 → bχ˜ ± 1 → bW(∗)χ˜ 0 1, where χ˜ 0 1 (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 tχ˜ 0 1, top-squark masses in the range 450−950 GeV are excluded for χ˜ 0 1 masses below 160 GeV. In the case where mt˜1 ∼ mt + mχ˜ 0 1 , top-squark masses in the range 235−590 GeV are excluded.

Item Type: Article
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Subjects: Q Science > QC Physics
Depositing User: Billy Wichaidit
Date Deposited: 14 Sep 2017 13:32
Last Modified: 14 Sep 2017 13:32
URI: http://sro.sussex.ac.uk/id/eprint/70193

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Project NameSussex Project NumberFunderFunder Ref
ATLASG0275STFC-SCIENCE AND TECHNOLOGY FACILITIES COUNCILST/I006048/1