Abstract

The associated production of jets and vector bosons allows for stringent tests of perturbative QCD calculations and is sensitive to the possible presence of new physics beyond the Standard Model. Measurements of jet production rates in association with W, Z or photons, in protonproton collisions at a 7 TeV center-of-mass energy are presented, using data collected with the CMS detector. In particular, we compare data to the theory predictions on jet rates, dijet invariant mass, angular correlations and event shapes distributions.

Highlights

  • Measurements of jet production rates in association with W, Z or photons, in protonproton collisions at a 7 TeV center-of-mass energy are presented, using data collected with the CMS detector

  • The precision of the NLO predictions is limited by the uncertainties on parton density functions (PDF): it can vary from 10% up to 30%

  • Studies are performed as a function of the jet multiplicity for the Z boson inclusive production and for a boosted system in which the Z boson has transverse momentum greater than 150

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Summary

Rates of Jets Produced in Association with W and Z Bosons in pp Collisions at

The study of jet production in association with W and Z bosons (V+jets) in proton-proton collisions at s = 7 TeV, using the full 2010 dataset collected by CMS is presented [2]. This process is an important test of perturbative QCD calculation, given the availability of “Nextto-leading order” (NLO) predictions up to four (three) jets for the Z (W) boson. If the second leading lepton is found, a Z boson candidate is acquired: the invariant mass between the two leptons is calculated and it must lie within the window 60-120 GeV. Same cuts are applied as for the first one

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