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=7TeV correspond to an integrated luminosity of 5.0fb-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. The experimental results are corrected for detector effects, and can be compared directly with other QCD models. © 2013 CERN
Martelli, A. (2013). Event shapes and azimuthal correlations in Z+jets events in pp collisions at √s=7TeV. PHYSICS LETTERS. SECTION B, 722(4-5), 238-261 [10.1016/j.physletb.2013.04.025].
Event shapes and azimuthal correlations in Z+jets events in pp collisions at √s=7TeV
MARTELLI, ARABELLA
2013
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=7TeV correspond to an integrated luminosity of 5.0fb-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. The experimental results are corrected for detector effects, and can be compared directly with other QCD models. © 2013 CERNI documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.