Search for new physics in top quark production in dilepton final states in proton-proton collisions at $\sqrt{s}$ = 13 TeV
(2019) European Physical Journal C. Particles and Fields — Vol. C79, p. 886 (2019)
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- A search for new physics in top quark production is performed in proton-proton collisions at $13\,\text {TeV} $ . The data set corresponds to an integrated luminosity of $35.9{\,\text {fb}^{-1}} $ collected in 2016 with the CMS detector. Events with two opposite-sign isolated leptons (electrons or muons), and $\mathrm{b}$ 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 $\mathrm{W}$ 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 $\mathrm{t}\mathrm{W}$ from $\mathrm{t}{\bar{\mathrm{t}}}$ events and exploiting the specific sensitivity of the $\mathrm{t}\mathrm{W}$ process to new physics.
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Bakhshiansohi, H., Bondu, O., Bruno, G., Caputo, C., David, P., Delaere, C., Delcourt, M., Giammanco, A., Krintiras, G., Lemaitre, V., Magitteri, A., Piotrzkowski, K., Saggio, A., Vidal Marono, M., Vischia, P., Zobec, J., CMS Collaboration, & et al. (2019). Search for new physics in top quark production in dilepton final states in proton-proton collisions at $\sqrt{s}$ = 13 TeV. European Physical Journal C. Particles and Fields, C79, 886. https://doi.org/10.1140/epjc/s10052-019-7387-y (Original work published 2019)