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
- Autores
- Alonso, Francisco; Arduh, Francisco Anuar; Dova, María Teresa; Hoya, Joaquín; Monticelli, Fernando Gabriel; Orellana, Gonzalo Enrique; Wahlberg, Hernán Pablo; The ATLAS Collaboration
- Año de publicación
- 2020
- Idioma
- inglés
- Tipo de recurso
- artículo
- Estado
- versión publicada
- Descripción
- 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.
La lista completa de autores puede verse al final del archivo asociado.
Instituto de Física La Plata - Materia
-
Física
Particle physics
Supersymmetry
Physics
Energy (signal processing)
Hadron
Top quark
Neutralino
Leptoquark
Pair production
Standard model - Nivel de accesibilidad
- acceso abierto
- Condiciones de uso
- http://creativecommons.org/licenses/by/4.0/
- Repositorio
.jpg)
- Institución
- Universidad Nacional de La Plata
- OAI Identificador
- oai:sedici.unlp.edu.ar:10915/125374
Ver los metadatos del registro completo
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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 detectorAlonso, FranciscoArduh, Francisco AnuarDova, María TeresaHoya, JoaquínMonticelli, Fernando GabrielOrellana, Gonzalo EnriqueWahlberg, Hernán PabloThe ATLAS CollaborationFísicaParticle physicsSupersymmetryPhysicsEnergy (signal processing)HadronTop quarkNeutralinoLeptoquarkPair productionStandard modelA 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.La lista completa de autores puede verse al final del archivo asociado.Instituto de Física La Plata2020-08-13info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfhttp://sedici.unlp.edu.ar/handle/10915/125374enginfo:eu-repo/semantics/altIdentifier/issn/1434-6044info:eu-repo/semantics/altIdentifier/issn/1434-6052info:eu-repo/semantics/altIdentifier/doi/10.1140/epjc/s10052-020-8102-8info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by/4.0/Creative Commons Attribution 4.0 International (CC BY 4.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2025-09-29T11:29:54Zoai:sedici.unlp.edu.ar:10915/125374Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-09-29 11:29:54.549SEDICI (UNLP) - Universidad Nacional de La Platafalse |
| dc.title.none.fl_str_mv |
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 |
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 |
| spellingShingle |
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 Alonso, Francisco Física Particle physics Supersymmetry Physics Energy (signal processing) Hadron Top quark Neutralino Leptoquark Pair production Standard model |
| 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 |
| dc.creator.none.fl_str_mv |
Alonso, Francisco Arduh, Francisco Anuar Dova, María Teresa Hoya, Joaquín Monticelli, Fernando Gabriel Orellana, Gonzalo Enrique Wahlberg, Hernán Pablo The ATLAS Collaboration |
| author |
Alonso, Francisco |
| 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_role |
author |
| author2 |
Arduh, Francisco Anuar Dova, María Teresa Hoya, Joaquín Monticelli, Fernando Gabriel Orellana, Gonzalo Enrique Wahlberg, Hernán Pablo The ATLAS Collaboration |
| author2_role |
author author author author author author author |
| dc.subject.none.fl_str_mv |
Física Particle physics Supersymmetry Physics Energy (signal processing) Hadron Top quark Neutralino Leptoquark Pair production Standard model |
| topic |
Física Particle physics Supersymmetry Physics Energy (signal processing) Hadron Top quark Neutralino Leptoquark Pair production Standard model |
| dc.description.none.fl_txt_mv |
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. La lista completa de autores puede verse al final del archivo asociado. Instituto de Física La Plata |
| 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. |
| publishDate |
2020 |
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2020-08-13 |
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eng |
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