Search for new physics in top quark production in dilepton final states in proton-proton collisions at $$\sqrt{s} = 13\,\text {TeV} $$s=13TeV

• Main Authors: Sirunyan, A. M (Author), Tumasyan, A. (Author), Adam, W. (Author), Ambrogi, F. (Author), Asilar, E. (Author), Bergauer, T. (Author), Brandstetter, J. (Author), Dragicevic, M. (Author), Erö, J. (Author), Del Valle, A. E (Author), Flechl, M. (Author), Frühwirth, R. (Author), Ghete, V. M (Author), Hrubec, J. (Author), Jeitler, M. (Author), Krammer, N. (Author), Krätschmer, I. (Author), Liko, D. (Author), Madlener, T. (Author), Mikulec, I. (Author)
• Format: Article
• Language: English
• Published: Springer Berlin Heidelberg, 2021-09-20T17:29:27Z.
• Subjects: Article
• Online Access: Get fulltext

Abstract A search for new physics in top quark production is performed in proton-proton collisions at $$13\,\text {TeV} $$13TeV. The data set corresponds to an integrated luminosity of $$35.9{\,\text {fb}^{-1}} $$35.9fb-1 collected in 2016 with the CMS detector. Events with two opposite-sign isolated leptons (electrons or muons), and $$\mathrm{b}$$b quark jets in the final state are selected. The search is sensitive to new physics in top quark pair production and in single top quark production in association with a $$\mathrm{W}$$W boson. No significant deviation from the standard model expectation is observed. Results are interpreted in the framework of effective field theory and constraints on the relevant effective couplings are set, one at a time, using a dedicated multivariate analysis. This analysis differs from previous searches for new physics in the top quark sector by explicitly separating $$\mathrm{t}\mathrm{W}$$tW from $$\mathrm{t}{\bar{\mathrm{t}}}$$tt¯ events and exploiting the specific sensitivity of the $$\mathrm{t}\mathrm{W}$$tW process to new physics.