A combination of searches for the single production of vectorlike top quarks (๐) is presented. These analyses are based on proton-proton collisions at โ๐ =13โโTeV recorded in 2015โ2018 with the ATLAS detector at the Large Hadron Collider, corresponding to an integrated luminosity of 139โโfbโ1. The ๐ decay modes considered in this combination are into a top quark and either a Standard Model Higgs boson or a ๐ boson (๐ โ๐ปโก๐ก and ๐โ๐โข๐ก). The individual searches used in the combination are differentiated by the number of leptons (๐, ๐) in the final state. The observed data are found to be in good agreement with the Standard Model background prediction. Interpretations are provided for a range of masses and couplings of the vectorlike top quark for benchmark models and generalized representations in terms of 95% confidence level limits. For a benchmark signal prediction of a vectorlike top quark SU(2) singlet with electroweak coupling, ๐ , of 0.5, masses below 2.1 TeV are excluded, resulting in the most restrictive limits to date.
Combination of searches for singly produced vectorlike top quarks in ๐โข๐ collisions at โ๐ =13โโTeV with the ATLAS detector
Cristoforetti, M.;Di Luca, A.;
2025-01-01
Abstract
A combination of searches for the single production of vectorlike top quarks (๐) is presented. These analyses are based on proton-proton collisions at โ๐ =13โโTeV recorded in 2015โ2018 with the ATLAS detector at the Large Hadron Collider, corresponding to an integrated luminosity of 139โโfbโ1. The ๐ decay modes considered in this combination are into a top quark and either a Standard Model Higgs boson or a ๐ boson (๐ โ๐ปโก๐ก and ๐โ๐โข๐ก). The individual searches used in the combination are differentiated by the number of leptons (๐, ๐) in the final state. The observed data are found to be in good agreement with the Standard Model background prediction. Interpretations are provided for a range of masses and couplings of the vectorlike top quark for benchmark models and generalized representations in terms of 95% confidence level limits. For a benchmark signal prediction of a vectorlike top quark SU(2) singlet with electroweak coupling, ๐ , of 0.5, masses below 2.1 TeV are excluded, resulting in the most restrictive limits to date.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.