Search for new physics in top quark production in dilepton final states in proton-proton collisions at root s=13 TeV
EUROPEAN PHYSICAL JOURNAL C, vol.79, no.11, 2019 (SCI-Expanded, Scopus)
- Publication Type: Article / Article
- Volume: 79 Issue: 11
- Publication Date: 2019
- Doi Number: 10.1140/epjc/s10052-019-7387-y
- Journal Name: EUROPEAN PHYSICAL JOURNAL C
- Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
- Middle East Technical University Affiliated: Yes
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 t (t) over bar events and exploiting the specific sensitivity of the tW process to new physics.