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Measurement of the cross-section for b-jets produced in association with a Z boson at √s=7 TeV with the ATLAS detector

CollaborationWith : Abdelalim Aly, Ahmed Aly / Alexandre, Gauthier / Backes, Moritz / Barone, Gaetano / Bell, Paul / Bell, William / Berglund, Frida Elina / Blondel, Alain / Bucci, Francesca / Clark, Allan Geoffrey / Dao, Valerio / Ferrere, Didier / Gadomski, Szymon / Garcia Navarro, Jose Enrique / Gaumer, Olivier / Gonzalez Sevilla, Sergio / Goulette, Marc / Hamilton, Andrew / Iacobucci, Giuseppe / Leger, Annie / Lister, Alison / Martin Dit Latour, Bertrand / Mora Herrera, Maria Clemencia Rosario / Nektarijevic, Snezana / Nikolics, Katalin / Pasztor, Arpad / Pohl, Martin / Robichaud-Veronneau, Andrée / Rosbach, Kilian / Rosselet, Laurent / Wu, Xin
Published in Physics letters. B. 2012, vol. 706, no. 4-5, p. 295-313
Abstract A measurement is presented of the inclusive cross-section for b-jet production in association with a Z boson in pp collisions at a centre-of-mass energy of √s=7 TeV. The analysis uses the data sample collected by the ATLAS experiment in 2010, corresponding to an integrated luminosity of approximately 36 pb−1. The event selection requires a Z boson decaying into high pTpT electrons or muons, and at least one b-jet, identified by its displaced vertex, with transverse momentum pT>25 GeVpT>25 GeV and rapidity |y|<2.1|y|<2.1. After subtraction of background processes, the yield is extracted from the vertex mass distribution of the candidate b-jets. The ratio of this cross-section to the inclusive Z cross-section (the average number of b-jets per Z event) is also measured. Both results are found to be in good agreement with perturbative QCD predictions at next-to-leading order.
Keywords Standard ModelZ bosonB-JetCross-section
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ATLAS COLLABORATION. Measurement of the cross-section for b-jets produced in association with a Z boson at √s=7 TeV with the ATLAS detector. In: Physics letters. B, 2012, vol. 706, n° 4-5, p. 295-313. doi: 10.1016/j.physletb.2011.11.059 https://archive-ouverte.unige.ch/unige:40524

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Deposited on : 2014-09-26

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