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Measurement of jet multiplicity distributions in ttU+207B production in pp collisions at U+221As=7TeV

Journal Contribution - Journal Article

Subtitle:Measurement of jet multiplicity distributions in t(t)over-bar production in pp collisions at root s=7TeV
The normalised differential top quark-antiquark production cross section is measured as a function of the jet multiplicity in proton-proton collisions at a centre-of-mass energy of 7 TeV at the LHC with the CMS detector. The measurement is performed in both the dilepton and lepton+jets decay channels using data corresponding to an integrated luminosity of 5.0 fb(-1). Using a procedure to associate jets to decay products of the top quarks, the differential cross section of the t (t) over bar production is determined as a function of the additional jet multiplicity in the lepton+jets channel. Furthermore, the fraction of events with no additional jets is measured in the dilepton channel, as a function of the threshold on the jet transverse momentum. The measurements are compared with predictions from perturbative quantum chromodynamics and no significant deviations are observed.
Journal: European Physical Journal C -- Particles & Fields
ISSN: 1434-6044
Issue: 8
Volume: 74
Number of pages: 1
Publication year:2014
Keywords:Particle & nuclear physics