Jet Multiplicity in Top-Quark Pair Events at CMS

The normalised differential top quark-antiquark production cross section is measured as a function of the jet multiplicity. Using a procedure to associate jets to decay products of the top quarks, the differential cross section of the ttbar production is determined as a function of the additional jet multiplicity. The fraction of events with no additional jets is measured as a function of the threshold required for the transverse momentum of the additional jet. The measurements are compared with predictions from perturbative quantum chromodynamics and no significant deviations are observed.Comment: Poster shown at TOP2014 - 7th International Workshop on Top-Quark Physics Conference, Cannes (France

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