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

This Letter reports the observation of a high transverse momentum Z → bb¯ signal in proton–proton collisions at View the MathML source and the measurement of its production cross section. The data analyzed 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-k t jet algorithm with R=0.4, that have low angular separation and form a dijet with p T > 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. As a result, the fiducial cross section is determined to be σ fid Z → bb¯ = 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.
Authors:
 [1] ;  [2] ;  [3]
  1. Aix-Marseille Univ. and CNRS/IN2P3, Marseille (France)
  2. Univ. of Oklahoma, Norman, OK (United States)
  3. Academia Sinica, Taipei (Taiwan). et al.
Publication Date:
Report Number(s):
BNL-107280-2014-JA
Journal ID: ISSN 0370-2693; KA1101021
Grant/Contract Number:
AC02-98CH10886; AC02-06CH11357; AC02-05CH11231; SC00112704; AC03-76SF00515
Type:
Published Article
Journal Name:
Physics Letters. Section B
Additional Journal Information:
Journal Volume: 738; Journal Issue: C; Journal ID: ISSN 0370-2693
Publisher:
Elsevier
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States); Argonne National Lab. (ANL), Argonne, IL (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Contributing Orgs:
ATLAS Collaboration
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; LHC; boosted bb¯ topologies
OSTI Identifier:
1213866
Alternate Identifier(s):
OSTI ID: 1166971; OSTI ID: 1223325