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Measurement of the cross section of high transverse momentum Z→bb production in proton-proton collisions at √s=8 TeV with the ATLAS detector
Journal article   Peer reviewed

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

G. Aad, B. Abbott, J. Abdallah, S. Abdel Khalek, O. Abdinov, R. Aben, B. Abi, M. Abolins, O.S. AbouZeid, H. Abramowicz, …
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, Vol.738, pp.25-43
2014

Abstract

Boosted bb topologies LHC
This Letter reports the observation of a high transverse momentum Z→bb signal in proton-proton col-lisions at √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 19.5fb <sup>-1</sup> . The Z→bb decay is reconstructed from a pair of b-tagged jets, clustered with the anti-k <sub>t</sub> jet algorithm with R =0.4, that have low angular separation and form a dijet with p <sub>T</sub> > 200GeV. The signal yield is extracted from a fit to the dijet invariant mass distribution, with the dominant, multi-jet back-ground 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 σ <sup>fid</sup> <sub>Z→bb</sub> =2.02±0.20(stat.) ±0.25(syst.) ±0.06(lumi.) pb=2.02±0.33pb, in good agreement with next-to-leading-order theoretical predictions.
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https://doi.org/10.1016/j.physletb.2014.09.020View
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