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

Author(s)
CMS Collaboration; Apyan, Aram; Bauer, Gerry P; Busza, Wit; Cali, Ivan Amos; Chan, Matthew Hans; Di Matteo, Leonardo; Dutta, Valentina; Gomez-Ceballos, Guillelmo; Goncharov, Maxim; Gulhan, Doga Can; Kim, Yongsun; Klute, Markus; Lai, Yue Shi; Levin, Andrew Michael; Luckey Jr, P David; Ma, Teng; Nahn, Steven; Paus, Christoph M. E.; Ralph, Duncan Kelley; Roland, Christof E; Roland, Gunther M; Stephans, George S. F.; Stoeckli, Fabian; Sumorok, Konstanty C; Velicanu, Dragos Alexandru; Wolf, Roger; Wyslouch, Boleslaw; Yang, Ming; Yilmaz, Yetkin; Yoon, A. S.; Zanetti, Marco; Wyslouch, Victoria; ... Show more Show less
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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 fb[superscript -1]. The Z(ℓℓ) + b-jets cross sections (where ℓℓ = μμ or ee) are measured separately for a Z boson produced with exactly one b jet and with 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. [Figure not available: see fulltext.] Keywords: Jet physics; Hadron-Hadron Scattering
Date issued
2014-06
URI
http://hdl.handle.net/1721.1/116166
Department
Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science
Journal
Journal of High Energy Physics
Publisher
Springer Berlin Heidelberg
Citation
Chatrchyan, S. et al. “Measurement of the production cross sections for a Z boson and one or more b jets in pp collisions at √s = 7 TeV.” Journal of High Energy Physics 2014, 6 (June 2014): 120 © 2014 The Author(s)
Version: Final published version
ISSN
1029-8479

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