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

• Main Authors: Apyan, Aram (Contributor), Bauer, Gerry P. (Contributor), Busza, Wit (Contributor), Cali, Ivan Amos (Contributor), Chan, M. (Contributor), Di Matteo, Leonardo (Contributor), Dutta, V. (Contributor), Goncharov, Maxim (Contributor), Gulhan, Doga Can (Contributor), Kim, Y. (Contributor), Klute, Markus (Contributor), Lai, Yue Shi (Contributor), Levin, A. (Contributor), Luckey, P. David, Jr (Contributor), Ma, Teng (Contributor), Nahn, Steven (Contributor), Paus, Christoph M. E. (Contributor), Ralph, Duncan Kelley (Contributor), Roland, Christof E. (Contributor), Roland, Gunther M. (Contributor), Stephans, George S. F. (Contributor), Stockli, Fabian (Contributor), Sumorok, Konstanty C. (Contributor), Velicanu, Dragos Alexandru (Contributor), Wolf, R. (Contributor), Wyslouch, Boleslaw (Contributor), Yang, M. (Contributor), Yilmaz, Yetkin (Contributor), Yoon, A. S. (Contributor), Zanetti, Marco (Contributor), Zhukova, Victoria (Contributor), Gomez-Ceballos, Guillelmo (Contributor)
• Other Authors: Massachusetts Institute of Technology. Department of Physics (Contributor), Massachusetts Institute of Technology. Laboratory for Nuclear Science (Contributor), Massachusetts Institute of Technology. School of Science (Contributor)
• Format: Article
• Language: English
• Published: Springer-Verlag, 2014-09-11T17:39:55Z.
• Subjects: Article
• Online Access: Get fulltext

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.
United States. Dept. of Energy
National Science Foundation (U.S.)