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Measurement of the production cross sections for a Z boson and one or more b jets in pp collisions at sqrt(s) = 7 TeV

Abstract : The production of a Z boson, decaying into two leptons and produced in association with one or more b jets, is studied using proton-proton collisions delivered by the LHC at a centre-of-mass energy of 7 TeV. The data were recorded in 2011 with the CMS detector and correspond to an integrated luminosity of 5 inverse femtobarns. The Z(ll)+b-jets cross sections (where ll = mu mu or ee) are measured for a Z boson produced with exactly one or at least two b jets. In addition, a cross section ratio is extracted for a Z boson produced with at least one b jet relative to a Z boson produced with at least one jet. The measured cross sections are compared to various theoretical predictions, and the data favour the predictions in the five-flavour scheme, where b quarks are assumed massless. The kinematic properties of the reconstructed particles are compared with the predictions from the MADGRAPH event generator using the PYTHIA parton shower simulation.
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http://hal.in2p3.fr/in2p3-00945588
Contributor : Sylvie Flores <>
Submitted on : Wednesday, February 12, 2014 - 3:38:01 PM
Last modification on : Wednesday, November 25, 2020 - 4:10:43 PM

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S. Chatrchyan, S. Baffioni, F. Beaudette, L. Benhabib, M. Bluj, et al.. Measurement of the production cross sections for a Z boson and one or more b jets in pp collisions at sqrt(s) = 7 TeV. Journal of High Energy Physics, Springer, 2014, 6, pp.120. ⟨10.1007/JHEP06(2014)120⟩. ⟨in2p3-00945588⟩

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