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CDF_2008_S7541902

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Measurement of the cross section for W boson production in association with jets in pˉp collisions at s=1.96 TeV. The analysis uses 320 pb1 of data collected with the CDF II detector. W bosons are identified in their eν decay channel and jets are reconstructed using an R<0.4 cone algorithm. For each W+ n-jet sample (where n = 1--4) a measurement of dσ(pˉpW+ n jet)/dET(nth-jet) × BR(Weν) is made, where dET(nth-jet) is the Et of the nth-highest Et jet above 20 GeV. A measurement of the total cross section, σ(pˉpW+ n-jet) × BR(Weν) with ET(nthjet)>25 GeV is also made. Both measurements are made for jets with |η|<2 and for a limited region of the Weν decay phase space; |ηe|<1.1, peT>20 GeV, pνT>30 GeV and MT>20 GeV. The cross sections are corrected for all detector effects and can be directly compared to particle level W + jet(s) predictions. These measurements can be used to test and tune QCD predictions for the number of jets in and kinematics of W + jets events.

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