Measurement of differential Z/gamma*+jet+X cross sections in proton anti-proton collisions at sqrt{s}=1.96 TeV

Abstract

We present new measurements of differential cross sections for Z/gamma*(->mumu)+jet+X production in a 1 fb-1 data sample collected with the D0 detector in proton anti-proton collisions at sqrt{s}=1.96 TeV. Results include the first measurements differential in the Z/gamma* transverse momentum and rapidity, as well as new measurements differential in the leading jet transverse momentum and rapidity. Next-to-leading order perturbative QCD predictions are compared to the measurements, and reasonable agreement is observed, except in the region of low Z/gamma* transverse momentum. Predictions from two event generators based on matrix elements and parton showers, and one pure parton shower event generator are also compared to the measurements. These show significant overall normalization differences to the data and have varied success in describing the shape of the distributions.

Figures (5)

• Figure 1: The migration matrix for leading $p_{T}^{\mathrm{jet}}$. Element $i,j$ is the probability for a particle jet in $p_{T}$ bin $i$ to be measured in $p_{T}$ bin $j$, represented by the area of each box. Each row sums to unity.
• Figure 2: (a) The measured cross section in bins of leading $p_{T}^{\mathrm{jet}}$ for $Z/\gamma^*$ + jet + $X$ events. Predictions from NLO pQCD and alpgen are compared to the data. (b) The ratio of data and predictions from NLO pQCD + corrections, sherpa, and pythia to the prediction from alpgen.
• Figure 3: (a) The measured cross section in bins of leading $|\hbox{$y^{\mathrm{jet}}$}|$ for $Z/\gamma^*$ + jet + $X$ events. Predictions from NLO pQCD and alpgen are compared to the data. (b) The ratio of data and predictions from NLO pQCD + corrections, sherpa, and pythia to the prediction from alpgen.
• Figure 4: (a) The measured cross section in bins of $p_{T}^{Z}$ for $Z/\gamma^*$ + jet + $X$ events. Predictions from NLO pQCD and alpgen are compared to the data. (b) The ratio of data and predictions from NLO pQCD + corrections, sherpa, and pythia to the prediction from alpgen.
• Figure 5: (a) The measured cross section in bins of $|\hbox{$y^Z$}|$ for $Z/\gamma^*$ + jet + $X$ events. Predictions from NLO pQCD and alpgen are compared to the data. (b) The ratio of data and predictions from NLO pQCD + corrections, sherpa, and pythia to the prediction from alpgen.