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

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Horváth ,A A Bin Anuar,M Flechl,N Godinović ,P E Karchin,Wan Ahmad Tajuddin Wan Abdullah ,S M A Ghiasi Shirazi,A G Stahl Leiton,M Guchait,R I Rabadán Trejo ,E Ayala

doi:10.1140/epjc/s10052-019-7387-y

Abstract

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.

Highlights

Because of its large mass, close to the electroweak (EW) symmetry breaking scale, the top quark is predicted to play an important role in several new physics scenarios
If the new physics scale is in the available energy range of the CERN LHC, the existence of new physics could be directly observed via the production of new particles
The effective field theory (EFT) approach is followed to search for new physics in the top quark sector in the dilepton final states

Summary

Introduction

Because of its large mass, close to the electroweak (EW) symmetry breaking scale, the top quark is predicted to play an important role in several new physics scenarios. The new physics terms due to the CuG and CcG effective couplings do not interfere with the SM tW process, and the kinematic distributions of final-state particles are determined by the new physics terms independently of the SM prediction. In this analysis, we use the rates of tW and tt production to probe the C(φ3q), CtW, CtG, and CG effective couplings. We use the rates of tW and tt production to probe the C(φ3q), CtW, CtG, and CG effective couplings Variations in both rate and kinematic distributions of final-state particles are employed to probe the CuG and CcG effective couplings.

The CMS detector and event simulation

Event selection and background estimation

Signal extraction using neural networks tools

Systematic uncertainties

Constraints on the effective couplings

Exclusion limits on the CG effective coupling

Exclusion limits on the CuG and CcG effective couplings

Summary

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Journal: Zeitschrift für Physik C: Particles and Fields	Publication Date: Nov 1, 2019
Citations: 50	License type: open-access

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

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

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