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

A search for direct pair production of scalar partners of the top quark (top squarks or scalar third-generation up-type leptoquarks) in the all-hadronic tt ¯plus missing transverse momentum final state is presented. The analysis of 139 fb−1 of √s = 13 TeV proton–proton collision data collected using...

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Autores principales: Alonso, Francisco, Arduh, Francisco Anuar, Dova, María Teresa, Hoya, Joaquín, Monticelli, Fernando Gabriel, Orellana, Gonzalo Enrique, Wahlberg, Hernán Pablo, The ATLAS Collaboration
Formato: Articulo
Lenguaje:Inglés
Publicado: 2020
Materias:
Física
Particle physics
Supersymmetry
Physics
Energy (signal processing)
Hadron
Top quark
Neutralino
Leptoquark
Pair production
Standard model
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/125374
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-125374
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Física
Particle physics
Supersymmetry
Physics
Energy (signal processing)
Hadron
Top quark
Neutralino
Leptoquark
Pair production
Standard model
spellingShingle Física
Particle physics
Supersymmetry
Physics
Energy (signal processing)
Hadron
Top quark
Neutralino
Leptoquark
Pair production
Standard model
Alonso, Francisco
Arduh, Francisco Anuar
Dova, María Teresa
Hoya, Joaquín
Monticelli, Fernando Gabriel
Orellana, Gonzalo Enrique
Wahlberg, Hernán Pablo
The ATLAS Collaboration
Search for a scalar partner of the top quark in the all-hadronic tt‾ plus missing transverse momentum final state at √s=13 TeV with the ATLAS detector
topic_facet Física
Particle physics
Supersymmetry
Physics
Energy (signal processing)
Hadron
Top quark
Neutralino
Leptoquark
Pair production
Standard model
description A search for direct pair production of scalar partners of the top quark (top squarks or scalar third-generation up-type leptoquarks) in the all-hadronic tt ¯plus missing transverse momentum final state is presented. The analysis of 139 fb−1 of √s = 13 TeV proton–proton collision data collected using the ATLAS detector at the LHC yields no significant excess over the Standard Model background expectation. To interpret the results, a supersymmetric model is used where the top squark decays via t ˜ → t(∗) χ˜ 0 1 , with t(∗) denoting an on-shell (off-shell) top quark and χ˜ 0 1 the lightest neutralino. Three specific event selections are optimised for the following scenarios. In the scenario where mt ˜ > mt + mχ˜ 0 1 , top squark masses are excluded in the range 400–1250 GeV for χ˜ 0 1 masses below 200 GeV at 95% confidence level. In the situation where mt ˜ ∼ mt +mχ˜ 0 1 , top squark masses in the range 300–630 GeV are excluded, while in the case where mt ˜ < mW + mb + mχ˜ 0 1 (with mt ˜ − mχ˜ 0 1 ≥ 5 GeV), considered for the first time in an ATLAS all-hadronic search, top squark masses in the range 300–660 GeV are excluded. Limits are also set for scalar third-generation up-type leptoquarks, excluding leptoquarks with masses below 1240 GeV when considering only leptoquark decays into a top quark and a neutrino.
format Articulo
Articulo
author Alonso, Francisco
Arduh, Francisco Anuar
Dova, María Teresa
Hoya, Joaquín
Monticelli, Fernando Gabriel
Orellana, Gonzalo Enrique
Wahlberg, Hernán Pablo
The ATLAS Collaboration
author_facet Alonso, Francisco
Arduh, Francisco Anuar
Dova, María Teresa
Hoya, Joaquín
Monticelli, Fernando Gabriel
Orellana, Gonzalo Enrique
Wahlberg, Hernán Pablo
The ATLAS Collaboration
author_sort Alonso, Francisco
title Search for a scalar partner of the top quark in the all-hadronic tt‾ plus missing transverse momentum final state at √s=13 TeV with the ATLAS detector
title_short Search for a scalar partner of the top quark in the all-hadronic tt‾ plus missing transverse momentum final state at √s=13 TeV with the ATLAS detector
title_full Search for a scalar partner of the top quark in the all-hadronic tt‾ plus missing transverse momentum final state at √s=13 TeV with the ATLAS detector
title_fullStr Search for a scalar partner of the top quark in the all-hadronic tt‾ plus missing transverse momentum final state at √s=13 TeV with the ATLAS detector
title_full_unstemmed Search for a scalar partner of the top quark in the all-hadronic tt‾ plus missing transverse momentum final state at √s=13 TeV with the ATLAS detector
title_sort search for a scalar partner of the top quark in the all-hadronic tt‾ plus missing transverse momentum final state at √s=13 tev with the atlas detector
publishDate 2020
url http://sedici.unlp.edu.ar/handle/10915/125374
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