Observation and measurements of the production of prompt and non-prompt J/ψ mesons in association with a Z boson in pp collisions at √s = 8 TeV with the ATLAS detector
Author(s)
Taylor, Frank E.
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The production of a Z boson in association with a J/ψ meson in proton–proton collisions probes the production mechanisms of quarkonium and heavy flavour in association with vector bosons, and allows studies of multiple parton scattering. Using 20.3 fb[superscript −1] of data collected with the ATLAS experiment at the LHC in pp collisions at √s = 8 TeV, the first measurement of associated Z + J/ψ production is presented for both prompt and non-prompt J/ψ production, with both signatures having a significance in excess of 5σ. The inclusive production cross-sections for Z boson production (analysed in μ[superscript +]μ[superscript −] or e[superscript +]e[superscript −] decay modes) in association with prompt and non-prompt J/ψ(→ μ[superscript +]μ[superscript −]) are measured relative to the inclusive production rate of Z bosons in the same fiducial volume to be (36.8 ± 6.7 ± 2.5) × 10[superscript −7] and (65.8 ± 9.2 ± 4.2) × 10[superscript −7] respectively. Normalised differential production cross-section ratios are also determined as a function of the Jψ transverse momentum. The fraction of signal events arising from single and double parton scattering is estimated, and a lower limit of 5.3 (3.7) mb at 68 (95)% confidence level is placed on the effective cross-section regulating double parton interactions.
Date issued
2015-05Department
Massachusetts Institute of Technology. Department of PhysicsJournal
The European Physical Journal C
Publisher
Springer-Verlag
Citation
Aad, G., B. Abbott, J. Abdallah, S. Abdel Khalek, O. Abdinov, R. Aben, B. Abi, et al. “Observation and Measurements of the Production of Prompt and Non-Prompt J/ψ Mesons in Association with a Z Boson in pp Collisions at √s = 8 TeV with the ATLAS Detector.” The European Physical Journal C 75, no. 5 (May 2015). © 2015 CERN for the benefit of the ATLAS collaboration
Version: Final published version
ISSN
1434-6044
1434-6052