Measurement of t t-bar production with additional jet activity, including b quark jets, in the dilepton channel using pp collisions at sqrt(s) = 8 TeV

Understand

Jet multiplicity distributions in top quark pair (t t-bar) events are measured in pp collisions at a centre-of-mass energy of 8 TeV with the CMS detector at the LHC using a data set corresponding to an integrated luminosity of 19.7 inverse femtobarns.

• The measurement is performed in the dilepton decay channels (e+ e-, mu+ mu-, and e+/- mu-/+).
• The absolute and normalized differential cross sections for t t-bar production are measured as a function of the jet multiplicity in the event for different jet transverse momentum thresholds and the kinematic properties of the leading additional jets.
• The differential t t-bar b and t t-bar b b-bar cross sections are presented for the first time as a function of the kinematic properties of the leading additional b jets.