Measurement of associated production of Z bosons with charm quark jets in ppbar collisions at sqrt(s)=1.96 TeV

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We present the first measurements of the ratios of cross sections, \sigma(ppbar -> Z+c jet)/\sigma(ppbar -> Z+jet) and \sigma(ppbar -> Z+c jet)/\sigma(ppbar -> Z+b jet) for the associated production of a Z boson with at least one charm or bottom quark jet.

• Jets have transverse momentum p_{T}>20 GeV and pseudorapidity |\eta|<2.5.
• These cross section ratios are measured differentially as a function of jet and $Z$ boson transverse momenta, based on 9.7 fb^{-1} of ppbar collisions collected with the D0 detector at the Fermilab Tevatron Collider at sqrt(s) = 1.96 TeV.
• The measurements show significant deviations from perturbative QCD calculations and predictions from various event generators.