Search for new phenomena in events with two opposite-charge leptons, jets and missing transverse momentum in pp collisions at √s = 13 TeV with the ATLAS detector
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Fecha
2021-04
Profesor/a Guía
Facultad/escuela
Idioma
en
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Título del volumen
Editor
Springer Science and Business Media Deutschland GmbH
Nombre de Curso
Licencia CC
Licencia CC
Resumen
The results of a search for direct pair production of top squarks and for dark matter in events with two opposite-charge leptons (electrons or muons), jets and missing transverse momentum are reported, using 139 fb−1 of integrated luminosity from proton-proton collisions at s = 13 TeV, collected by the ATLAS detector at the Large Hadron Collider during Run 2 (2015–2018). This search considers the pair production of top squarks and is sensitive across a wide range of mass differences between the top squark and the lightest neutralino. Additionally, spin-0 mediator dark-matter models are considered, in which the mediator is produced in association with a pair of top quarks. The mediator subsequently decays to a pair of dark-matter particles. No significant excess of events is observed above the Standard Model background, and limits are set at 95% confidence level. The results exclude top squark masses up to about 1 TeV, and masses of the lightest neutralino up to about 500 GeV. Limits on dark-matter production are set for scalar (pseudoscalar) mediator masses up to about 250 (300) GeV. [Figure not available: see fulltext.] © 2021, The Author(s).
Notas
Indexación Scopus
Palabras clave
Top Quark, Partons, Higgs Bosons
Citación
Journal of High Energy Physics, Volume 2021, Issue 4, April 2021, Article number 165
DOI
10.1007/JHEP04(2021)165