Observation and Measurements of the Production of Prompt and Non-Prompt J/ψ Mesons in Association with a Z Boson in pp Collisions at √s̅ = 8 TeV with the ATLAS Detector

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Observation and Measurements of the Production of Prompt and Non-Prompt J/ψ Mesons in Association with a Z Boson in pp Collisions at √s̅ = 8 TeV with the ATLAS Detector

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Title: Observation and Measurements of the Production of Prompt and Non-Prompt J/ψ Mesons in Association with a Z Boson in pp Collisions at √s̅ = 8 TeV with the ATLAS Detector
Author(s):
Aad, G.;
Abbott, B.;
Abdallah, J.;
Abdel Khalek, S.;
Abdinov, O.;
Aben, R.;
Abi, B.;
Izen, Joseph M. (UT Dallas);
Leyton, Michael (UT Dallas);
Meirose, Bernhard (UT Dallas);
Namasivayam, Harisankar (UT Dallas);
Reeves, Kendall (UT Dallas);
ATLAS Collaboration
Item Type: Article
Keywords: Show Keywords
Abstract: 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⁻¹ of data collected with the ATLAS experiment at the LHC in pp collisions at √s̅ = 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⁺μ⁺ or e⁺e⁻ decay modes) in association with prompt and non-prompt J/ψ (→ μ⁺μ⁺) are measured relative to the inclusive production rate of Z bosons in the same fiducial volume to be (36.8 ± 6.7 ± 2.5) x 10⁻⁷ and (65.8 ± 9.2 ± 4.2) x 10⁻⁷ respectively. Normalised differential production cross-section ratios are also determined as a function of the J/ψ 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.
Publisher: Springer
ISSN: 1434-6044
Persistent Link: http://hdl.handle.net/10735.1/2492
http://dx.doi.org/10.1029/2012JA017892
Bibliographic Citation: Aad, G., B. Abbott, J. Abdallah, S. Abdel Khalek, et al. 2015. "Observation and measurements of the production of prompt and non-prompt J/psi mesons in association with a Z boson in pp collisions at √s̅ = 8 TeV with the ATLAS detector." European Physical Journal C 75(5), doi: 10.1140/epjc/s10052-015-3406-9
Terms of Use: CC BY 4.0 (Attribution) License
©2015 CERN, for the ATLAS Collaboration
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