Combination of the searches for pair-produced vectorlike partners of the third-generation quarks at √s =13 TeV with the ATLAS detector

• Autores: Alconada Verzini, María Josefina; 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: 2018
• Idioma: inglés
• Tipo de recurso: artículo
• Materia: Física
• Institución: Universidad Nacional de La Plata

A combination of the searches for pair-produced vectorlike partners of the top and bottom quarks in various decay channels (T → Zt=Wb=Ht, B → Zb=Wt=Hb) is performed using 36.1 fb−1 of pp collision data at √s p ¼ 13 TeV with the ATLAS detector at the Large Hadron Collider. The observed data are found to be in good agreement with the standard model background prediction in all individual searches. Therefore, combined 95% confidence-level upper limits are set on the production cross section for a range of vectorlike quark scenarios, significantly improving upon the reach of the individual searches. Modelindependent limits are set assuming the vectorlike quarks decay to standard model particles. A singlet T is excluded for masses below 1.31 TeV and a singlet B is excluded for masses below 1.22 TeV. Assuming a weak isospin ðT;BÞ doublet and |VTb| ≪ |VtB|, T and B masses below 1.37 TeV are excluded.
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Instituto de Física La Plata