Please use this identifier to cite or link to this item: http://hdl.handle.net/1822/39935

TitleObservation 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)Onofre, A.
Castro, Nuno Filipe Silva Fernandes
ATLAS Collaboration
KeywordsFlavor physics
QCD
Hard scattering
Heavy quark production
Experimental results
Issue date2015
PublisherSpringer Verlag
JournalThe European Physical Journal C: Particles and Fields
CitationAad, G., Abbott, B., Abdallah, J., Khalek, S. A., Abdinov, O., Aben, R., . . . Collaboration, A. (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 root s=8 TeV with the ATLAS detector. European Physical Journal C, 75(5). doi: 10.1140/epjc/s10052-015-3406-9
Abstract(s)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 20.3fb−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 (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 (88±16±6)×10−8 and (157±22±10)×10−8 respectively. Normalised differential production cross-sections 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.
TypeArticle
URIhttp://hdl.handle.net/1822/39935
DOI10.1140/epjc/s10052-015-3406-9
ISSN1434-6044
e-ISSN1434-6052
Peer-Reviewedyes
AccessOpen access
Appears in Collections:LIP - Artigos/papers

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