Measurements of tt¯ cross sections in association with b jets and inclusive jets and their ratio using dilepton final states in pp collisions at s=13TeV

• Main Authors: Sirunyan, A. M., Tumasyan, A. R., Adam, Wolfgang, Asilar, Ece, Bergauer, Thomas, Md. Ali, Mohd. Adli
• Format: Article
• Language: English; English
• Published: Elsevier BV 2018
• Subjects: QC Physics
• Online Access: http://irep.iium.edu.my/64873/1/64873_Measurements%20of%20tt%20cross%20%C2%AF%20sections%20in%20association_article.pdf; http://irep.iium.edu.my/64873/2/64873_Measurements%20of%20tt%20cross%20%C2%AF%20sections%20in%20association_scopus.pdf; http://irep.iium.edu.my/64873/; https://reader.elsevier.com/reader/sd/545DA63AAC482BE198EC948865C03E219BAC236EAA5E9E0C5C986F0845F997B96A1B39A564FB6DB26551198F1592216F

The cross sections for the production of tt¯bb¯ and tt¯jj events and their ratio σtt¯bb¯/σtt¯jj are measured using data corresponding to an integrated luminosity of 2.3 fb−1collected in pp collisions at s=13 TeV with the CMS detector at the LHC. Events with two leptons (e or μ) and at least four reconstructed jets, including at least two identified as b quark jets, in the final state are selected. In the full phase space, the measured ratio is 0.022±0.003(stat)±0.006(syst), the cross section σtt¯bb¯ is 4.0±0.6(stat)±1.3(syst) pb and σtt¯jj is 184±6(stat)±33(syst) pb. The measurements are compared with the standard model expectations obtained from a POWHEG simulation at next-to-leading-order interfaced with PYTHIA.