Search for a scalar partner of the top quark in the all-hadronic t ¯t plus missing transverse momentum final state at √ s = 13 TeV with the ATLAS detector
Autor(a) principal: | |
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Data de Publicação: | 2020 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10316/106037 https://doi.org/10.1140/epjc/s10052-020-8102-8 |
Resumo: | 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 t ¯t 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 m˜t > mt + m ˜χ 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 m˜t ∼ mt +m ˜χ 0 1 , top squarkmasses in the range 300–630 GeV are excluded, while in the case where m˜t < mW + mb + m ˜χ 0 1 (with m˜t − m ˜χ 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. |
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Search for a scalar partner of the top quark in the all-hadronic t ¯t plus missing transverse momentum final state at √ s = 13 TeV with the ATLAS detectorA 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 t ¯t 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 m˜t > mt + m ˜χ 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 m˜t ∼ mt +m ˜χ 0 1 , top squarkmasses in the range 300–630 GeV are excluded, while in the case where m˜t < mW + mb + m ˜χ 0 1 (with m˜t − m ˜χ 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.We thankCERNfor the very successful operation of the LHC, as well as the support staff from our institutions without whom ATLAS could not be operated efficiently. We acknowledge the support of ANPCyT, Argentina; YerPhI, Armenia; ARC, Australia; BMWFW and FWF, Austria; ANAS, Azerbaijan; SSTC, Belarus; CNPq and FAPESP, Brazil; NSERC, NRC and CFI, Canada; CERN; CONICYT, Chile; CAS, MOST and NSFC, China; COLCIENCIAS, Colombia; MSMT CR, MPO CR and VSC CR, Czech Republic; DNRF and DNSRC, Denmark; IN2P3-CNRS and CEA-DRF/IRFU, France; SRNSFG, Georgia; BMBF, HGF and MPG, Germany; GSRT, Greece; RGC and Hong Kong SAR, China; ISF and Benoziyo Center, Israel; INFN, Italy; MEXT and JSPS, Japan; CNRST, Morocco; NWO, Netherlands; RCN, Norway; MNiSW and NCN, Poland; FCT, Portugal;MNE/IFA, Romania;MES of Russia and NRC KI, Russia Federation; JINR; MESTD, Serbia; MSSR, Slovakia; ARRS andMIZŠ, Slovenia; DST/NRF, South Africa; MINECO, Spain; SRC and Wallenberg Foundation, Sweden; SERI, SNSF and Cantons of Bern and Geneva, Switzerland; MOST, Taiwan; TAEK, Turkey; STFC, United Kingdom; DOE and NSF, United States of America. In addition, individual groups and members have received support from BCKDF, CANARIE, Compute Canada and CRC, Canada; ERC, ERDF, Horizon 2020, Marie Skłodowska-Curie Actions and COST, European Union; Investissements d’Avenir Labex, Investissements d’Avenir Idex and ANR, France; DFG and AvH Foundation, Germany; Herakleitos, Thales and Aristeia programmes co-financed by EU-ESF and the Greek NSRF, Greece; BSF-NSF and GIF, Israel; CERCA Programme Generalitat de Catalunya and PROMETEO Programme Generalitat Valenciana, Spain; Göran Gustafssons Stiftelse, Sweden; The Royal Society and Leverhulme Trust, United Kingdom. The crucial computing support from all WLCG partners is acknowledged gratefully, in particular from CERN, the ATLAS Tier-1 facilities at TRIUMF (Canada), NDGF (Denmark, Norway, Sweden), CC-IN2P3 (France), KIT/GridKA (Germany), INFN-CNAF (Italy), NL-T1 (Netherlands), PIC (Spain), ASGC (Taiwan), RAL (UK) and BNL (USA), the Tier-2 facilities worldwide and large non-WLCG resource providers. Major contributors of computing resources are listed in Ref. [137].Springer Nature2020info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://hdl.handle.net/10316/106037http://hdl.handle.net/10316/106037https://doi.org/10.1140/epjc/s10052-020-8102-8engFiolhais, M. C. N.Gonçalo, R.Veloso, F.Wolters, H.ATLAS Collaborationinfo:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-03-16T21:35:22Zoai:estudogeral.uc.pt:10316/106037Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T21:22:29.933042Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Search for a scalar partner of the top quark in the all-hadronic t ¯t 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 t ¯t 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 t ¯t plus missing transverse momentum final state at √ s = 13 TeV with the ATLAS detector Fiolhais, M. C. N. |
title_short |
Search for a scalar partner of the top quark in the all-hadronic t ¯t 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 t ¯t 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 t ¯t 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 t ¯t 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 t ¯t plus missing transverse momentum final state at √ s = 13 TeV with the ATLAS detector |
author |
Fiolhais, M. C. N. |
author_facet |
Fiolhais, M. C. N. Gonçalo, R. Veloso, F. Wolters, H. ATLAS Collaboration |
author_role |
author |
author2 |
Gonçalo, R. Veloso, F. Wolters, H. ATLAS Collaboration |
author2_role |
author author author author |
dc.contributor.author.fl_str_mv |
Fiolhais, M. C. N. Gonçalo, R. Veloso, F. Wolters, H. ATLAS Collaboration |
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 t ¯t 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 m˜t > mt + m ˜χ 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 m˜t ∼ mt +m ˜χ 0 1 , top squarkmasses in the range 300–630 GeV are excluded, while in the case where m˜t < mW + mb + m ˜χ 0 1 (with m˜t − m ˜χ 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 |
dc.date.none.fl_str_mv |
2020 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10316/106037 http://hdl.handle.net/10316/106037 https://doi.org/10.1140/epjc/s10052-020-8102-8 |
url |
http://hdl.handle.net/10316/106037 https://doi.org/10.1140/epjc/s10052-020-8102-8 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.publisher.none.fl_str_mv |
Springer Nature |
publisher.none.fl_str_mv |
Springer Nature |
dc.source.none.fl_str_mv |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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RCAAP |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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