Event shapes and azimuthal correlations in $Z$ + jets events in $pp$ collisions at $\\sqrt{s}=7$ TeV
Journal
Physics Letters
Journal Volume
B722
Pages
238-261
Date Issued
2013-01
Abstract
Measurements of event shapes and azimuthal correlations are presented for events where a Z boson is produced in association with jets in proton-proton collisions. The data collected with the CMS detector at the CERN LHC at s = 7 TeV correspond to an integrated luminosity of 5.0 fb -1 . The analysis provides a test of predictions from perturbative QCD for a process that represents a substantial background to many physics channels. Results are presented as a function of jet multiplicity, for inclusive Z boson production and for Z bosons with transverse momenta greater than 150 GeV, and compared to predictions from Monte Carlo event generators that include leading-order multiparton matrix-element (with up to four hard partons in the final state) and next-to-leading-order simulations of Z + 1-jet events.
Type
journal article