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=13 TeV

Authors

S. Chatrchyan
Ekaterina Avdeeva, University of Nebraska-LincolnFollow
Kenneth Bloom, University of Nebraska-LincolnFollow
S. Bose, University of Nebraska - LincolnFollow
Jamila Butt, University of Nebraska - Lincoln
Daniel R. Claes, University of Nebraska-LincolnFollow
Aaron Dominguez, University of Nebraska-LincolnFollow
M. Eads, University of Nebraska-Lincoln, Lincoln,Follow
R. Gonzalez Suarez, University of Nebraska - Lincoln
P. Jindal, University of Nebraska - Lincoln
J. Keller, University of Nebraska - LincolnFollow
D. Knowlton, University of Nebraska-LincolnFollow
Ilya Kravchenko, University of Nebraska-LincolnFollow
Jose Lazo-Flores, University of Nebraska-LincolnFollow
Helena Malbouisson, University of Nebraska - Lincoln
Sudhir Malik, University of Nebraska - LincolnFollow
F. Meier, University of Nebraska-Lincoln, Lincoln,Follow
Gregory Snow, University of Nebraska - LincolnFollow

Date of this Version

2018

Citation

Physics Letters B 776 (2018) 355–378

Comments

© 2017 The Author.

Open access

https://doi.org/10.1016/j.physletb.2017.11.043

Abstract

The cross sections for the production of ttbb and ttjj events and their ratio σ_ttbb/σ_ttjj are measured using data corresponding to an integrated luminosity of 2.3fb⁻¹ collected 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 σ_ttbb is 4.0 ± 0.6(stat) ±1.3(syst) pb and σ_ttjj 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.