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Search for new physics in top quark production in dilepton final states in proton-proton collisions at $\sqrt{s} =$ 13 TeV
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abstract
A search for new physics in top quark production is performed in proton-proton collisions at 13 TeV. The data set corresponds to an integrated luminosity of 35.9 fb$^{-1}$ collected in 2016 with the CMS detector. Events with two opposite-sign isolated leptons (electrons or muons), and 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 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 tW from $\mathrm{t}\bar{\mathrm{t}}$ events and exploiting the specific sensitivity of the tW process to new physics.
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Cited by 1 Pith paper
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Separation of left-handed and anomalous right-handed vector operators contributions into the Wtb vertex for single and double resonant top quark production processes using a neural network
A two-stage neural network that separates single and double resonant top production improves the expected 95% CL limit on the right-handed Wtb coupling f_R^V from 0.21 to 0.17.
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