Publicação
Search for R-parity violating supersymmetric decays of the top squark to a b-jet and a lepton in √s=13 TeV pp collisions with the ATLAS detector
| Resumo: | A search is presented for direct pair production of the stop, the supersymmetric partner of the top quark, in a decay through an \( R \)-parity violating coupling to a charged lepton and a \( b \)-quark. The dataset corresponds to an integrated luminosity of 140\,fb\(^{-1}\) of proton-proton collisions at a center-of-mass energy of \(\sqrt{s} = 13\) TeV collected between 2015 and 2018 by the ATLAS detector at the LHC. The final state has two charged leptons (electrons or muons) and two \( b \)-jets. The results of the search are interpreted in the context of a Minimal Supersymmetric Standard Model with an additional \( B - L \) gauge symmetry that is spontaneously broken. No significant excess is observed over the Standard Model background, and exclusion limits on stop pair production are set at 95\% confidence level. The corresponding lower limits on the stop mass for 100\% branching ratios to a \( b \)-quark and an electron, muon, or tau-lepton are 1.9 TeV, 1.8 TeV and 800 GeV, respectively, extending the reach of previous LHC searches. |
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| Autores principais: | Castro, Nuno Filipe |
| Outros Autores: | Onofre, A.; ATLAS Collaboration |
| Assunto: | Ciências Naturais::Ciências Físicas |
| Ano: | 2024 |
| País: | Portugal |
| Tipo de documento: | artigo |
| Tipo de acesso: | acesso aberto |
| Instituição associada: | Universidade do Minho |
| Idioma: | inglês |
| Origem: | RepositóriUM - Universidade do Minho |
| Resumo: | A search is presented for direct pair production of the stop, the supersymmetric partner of the top quark, in a decay through an \( R \)-parity violating coupling to a charged lepton and a \( b \)-quark. The dataset corresponds to an integrated luminosity of 140\,fb\(^{-1}\) of proton-proton collisions at a center-of-mass energy of \(\sqrt{s} = 13\) TeV collected between 2015 and 2018 by the ATLAS detector at the LHC. The final state has two charged leptons (electrons or muons) and two \( b \)-jets. The results of the search are interpreted in the context of a Minimal Supersymmetric Standard Model with an additional \( B - L \) gauge symmetry that is spontaneously broken. No significant excess is observed over the Standard Model background, and exclusion limits on stop pair production are set at 95\% confidence level. The corresponding lower limits on the stop mass for 100\% branching ratios to a \( b \)-quark and an electron, muon, or tau-lepton are 1.9 TeV, 1.8 TeV and 800 GeV, respectively, extending the reach of previous LHC searches. |
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