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Event shapes and azimuthal correlations in Z + jets events in pp collisions at sqrt(s) =7 TeV

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 sqrt(s) = 7 TeV correspond to an integrated luminosity of 5.0 inverse femtobarns. 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.
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http://hal.in2p3.fr/in2p3-00771595
Contributor : Sylvie Flores <>
Submitted on : Wednesday, January 9, 2013 - 8:26:05 AM
Last modification on : Wednesday, November 25, 2020 - 4:10:43 PM

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S. Chatrchyan, M. Besançon, S. Choudhury, M. Dejardin, D. Denegri, et al.. Event shapes and azimuthal correlations in Z + jets events in pp collisions at sqrt(s) =7 TeV. Physics Letters B, Elsevier, 2013, 722, pp.238-261. ⟨10.1016/j.physletb.2013.04.025⟩. ⟨in2p3-00771595⟩

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