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Scientific article
Open access
English

Measurement of the cross section of high transverse momentum Z→bb¯ production in proton–proton collisions at √s=8 TeV with the ATLAS detector

ContributorsATLAS Collaboration
Published inPhysics letters. B, vol. 738, p. 25-43
Collection
  • Open Access - SCOAP3
Publication date2014
Abstract

This Letter reports the observation of a high transverse momentum Z→bb¯ signal in proton–proton collisions at s=8 TeV and the measurement of its production cross section. The data analysed were collected in 2012 with the ATLAS detector at the LHC and correspond to an integrated luminosity of 19.5 fb −1 . The Z→bb¯ decay is reconstructed from a pair of b -tagged jets, clustered with the anti- kt jet algorithm with R=0.4 , that have low angular separation and form a dijet with pT>200 GeV . The signal yield is extracted from a fit to the dijet invariant mass distribution, with the dominant, multi-jet background mass shape estimated by employing a fully data-driven technique that reduces the dependence of the analysis on simulation. The fiducial cross section is determined to be σZ→bb¯fid=2.02±0.20 (stat.) ±0.25 (syst.)±0.06 (lumi.) pb=2.02±0.33 pb, in good agreement with next-to-leading-order theoretical predictions.

Keywords
  • LHC
  • Boosted bb¯ topologies
Citation (ISO format)
ATLAS Collaboration. Measurement of the cross section of high transverse momentum Z→bb¯ production in proton–proton collisions at √s=8 TeV with the ATLAS detector. In: Physics letters. B, 2014, vol. 738, p. 25–43. doi: 10.1016/j.physletb.2014.09.020
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Article (Published version)
Identifiers
ISSN of the journal0370-2693
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