Measurement of the cross section of high transverse momentum Z -> b(b)over-bar production in proton-proton collisions at root s=8 TeV with the ATLAS detector

ATLAS Collaboration

Research output: Contribution to journalArticlepeer-review

Abstract

This Letter reports the observation of a high transverse momentum Z -{\textgreater} b (b) over bar signal in proton-proton collisions at root s = 8TeVand 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 -{\textgreater} b (b) over bar 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) {\textgreater} 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 sigma(fid)(Z -{\textgreater} b (b) over bar) = 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. Published by Elsevier B.V.
Original language English 25-43 Physics Letters B 738 https://doi.org/10.1016/j.physletb.2014.09.020 Published - 10 Nov 2014

Keywords

• LHC
• Boosted b(b)over-bar topologies

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