Utilize este identificador para referenciar este registo:
https://hdl.handle.net/1822/39882
Título: | Measurement of Spin Correlation in Top-Antitop Quark Events and Search for Top Squark Pair Production in pp Collisions at s√=8 TeV Using the ATLAS Detector |
Autor(es): | Onofre, A. Castro, Nuno Filipe Silva Fernandes ATLAS Collaboration |
Palavras-chave: | Flavor physics Top physics Experimental results |
Data: | 2015 |
Editora: | American Physical Society |
Revista: | Physical Review Letters |
Citação: | Aad, G., Abbott, B., Abdallah, J., Abdel Khalek, S., Abdinov, O., Aben, R., . . . Zwalinski, L. (2015). Measurement of spin correlation in top-antitop quark events and search for top squark pair production in pp collisions at s =8TeV using the ATLAS detector. Physical Review Letters, 114(14). doi: 10.1103/PhysRevLett.114.142001 |
Resumo(s): | A measurement of spin correlation in tt¯ production is presented using data collected with the ATLAS detector at the Large Hadron Collider in proton-proton collisions at a center-of-mass energy of 8 TeV, corresponding to an integrated luminosity of 20.3 fb−1. The correlation between the top and antitop quark spins is extracted from dilepton tt¯ events by using the difference in azimuthal angle between the two charged leptons in the laboratory frame. In the helicity basis the measured degree of correlation corresponds to Ahelicity=0.38±0.04, in agreement with the Standard Model prediction. A search is performed for pair production of top squarks with masses close to the top quark mass decaying to predominantly right-handed top quarks and a light neutralino, the lightest supersymmetric particle. Top squarks with masses between the top quark mass and 191 GeV are excluded at the 95% confidence level. |
Tipo: | Artigo |
URI: | https://hdl.handle.net/1822/39882 |
DOI: | 10.1103/PhysRevLett.114.142001 |
ISSN: | 0031-9007 |
Arbitragem científica: | yes |
Acesso: | Acesso aberto |
Aparece nas coleções: | LIP - Artigos/papers |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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ATLAS-20141216.pdf | 475,96 kB | Adobe PDF | Ver/Abrir |