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

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<sup>-1</sup> of √s = 13 TeV proton-proton collisions collected using the ATLAS detector at the LHC yields no significan...

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Bibliographic Details
Authors: Alconada Verzini, María Josefina, Alonso, Francisco, Arduh, Francisco Anuar, Dova, María Teresa, Hoya, Joaquín, Monticelli, Fernando Gabriel, Wahlberg, Hernán Pablo, The ATLAS Collaboration
Format: article
Status:Published version
Publication Date:2017
Country:Argentina
Institution:Universidad Nacional de La Plata
Repository:SEDICI (UNLP)
Language:English
OAI Identifier:oai:sedici.unlp.edu.ar:10915/82147
Online Access:http://sedici.unlp.edu.ar/handle/10915/82147
Access Level:Open access
Keyword:Ciencias Exactas
Física
hadron-hadron scattering
top quark
supersymmetry
Description
Summary: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<sup>-1</sup> 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<sub>1</sub> → t(*) ~X<sup>0</sup><sub>1</sub> and ~t<sub>1</sub> → b~X<sup>±</sup><sub>1</sub> → bW(*) ~X<sup>0</sup><sub>1</sub>, where ~X<sup>0</sup><sub>1</sub> (~X<sup>±</sup><sub>1</sub>) 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 ~X<sup>0</sup><sub>1</sub>, top-squark masses in the range 450-1000 GeV are excluded for ~X<sup>0</sup><sub>1</sub> masses below 160 GeV. In the case where m<sub>~t<sub>1</sub></sub> ~ m<sub>t</sub> +m<sub>~X<sup>0</sup><sub>1</sub></sub> , top-squark masses in the range 235-590 GeV are excluded.

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