Abstract
We present recent results on the jet production rates in association with weak vector bosons and their properties using proton-proton collision data collected with the CMS detector. Azimuthal correlations and events shapes in Z + jets events are also shown. A first measurement of the electroweak production cross section of a Z boson with 2 jets is presented, including measurements of the hadronic activity between the two associated jets.
Highlights
The study of jet production in association with a W or Z boson allows for tests of perturbative QCD calculations
Electron candidates are required to be in the fiducial region of the electromagnetic calorimeter with pseudorapidity |η| < 2.5, with the exclusion of 1.44 < |η| < 1.57
Z bosons are reconstructed if a second lepton of the same flavour is found, which fullfills looser quality requirements and pT > 10 GeV, and the dilepton invariant mass falls between 60 GeV and 120 GeV
Summary
The study of jet production in association with a W or Z boson allows for tests of perturbative QCD calculations. Events are selected if they have at least one lepton (electron or muon) with transverse momentum pT > 20 GeV, and satisfying quality and isolation requirements. Z bosons are reconstructed if a second lepton of the same flavour is found, which fullfills looser quality requirements and pT > 10 GeV, and the dilepton invariant mass falls between 60 GeV and 120 GeV. Jets constituents are reconstructed with the particle flow (PF) algorithm and are clustered using the anti-kT algorithm with size parameter of 0.5. These jets are accepted if they have pT > 30 GeV, |η| < 2.4 and fullfill standard quality identification criteria. We see again a good agreement between data and simulation
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