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@ARTICLE{Aad:205312,
      author       = {Aad, Georges and others},
      collaboration = {{ATLAS Collaboration}},
      title        = {{O}bservation and measurements of the production of prompt
                      and non-prompt ${J}/\psi$ mesons in association with a ${Z}$
                      boson in $pp$ collisions at $\sqrt{s}= 8$ {T}e{V} with the
                      {ATLAS} detector},
      reportid     = {PUBDB-2014-04713, CERN-PH-EP-2014-276. arXiv:1412.6428},
      year         = {2014},
      note         = {OA},
      abstract     = {The production of a $Z$ boson in association with a
                      $J/\psi$ 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 $\sqrt{s}=8$ TeV, the first measurement of
                      associated $Z + J/\psi$ production is presented for both
                      prompt and non-prompt $J/\psi$ production, with both
                      signatures having a significance in excess of $5\sigma$. The
                      inclusive production cross-sections for $Z$ boson production
                      (in $\mu^+\mu^-$ or $e^+e^-$ decay modes) in association
                      with prompt and non-prompt $J/\psi(\to\mu^+\mu^-)$ are
                      measured relative to the inclusive production rate of $Z$
                      bosons in the same fiducial volume to be $(88\pm 16\pm 6)
                      \times 10^{-8}$ and $(157\pm 22\pm 10) \times 10^{-8}$
                      respectively. Normalised differential production
                      cross-sections are also determined as a function of the
                      $J/\psi$ 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.},
      keywords     = {p p: colliding beams (INSPIRE) / parton: scattering
                      (INSPIRE) / p p: scattering (INSPIRE) / J/psi(3100):
                      hadroproduction (INSPIRE) / J/psi(3100): direct production
                      (INSPIRE) / J/psi(3100): leptonic decay (INSPIRE) / Z0:
                      associated production (INSPIRE) / Z0: leptonic decay
                      (INSPIRE) / parton: interaction (INSPIRE) / inclusive
                      production (INSPIRE) / channel cross section: ratio:
                      measured (INSPIRE) / differential cross section: ratio:
                      measured (INSPIRE) / ATLAS (INSPIRE) / transverse momentum:
                      dependence (INSPIRE) / CERN LHC Coll (INSPIRE) /
                      experimental results (INSPIRE) / p p --> J/psi(3100) Z0
                      anything (INSPIRE) / J/psi(3100) --> muon+ muon- (INSPIRE) /
                      Z0 --> muon+ muon- (INSPIRE) / Z0 --> electron positron
                      (INSPIRE) / 8000 GeV-cms (INSPIRE)},
      cin          = {ATLAS},
      cid          = {I:(DE-H253)ATLAS-20120731},
      pnm          = {Experiments at LHC (ATLAS) (POF2-512)},
      pid          = {G:(DE-H253)POF2-LHC-Exp.-(ATLAS)-20130405},
      experiment   = {EXP:(DE-H253)LHC-Exp-ATLAS-20150101},
      typ          = {PUB:(DE-HGF)25 / PUB:(DE-HGF)15},
      eprint       = {1412.6428},
      howpublished = {arXiv:1412.6428},
      archivePrefix = {arXiv},
      SLACcitation = {$\%\%CITATION$ = $arXiv:1412.6428;\%\%$},
      url          = {https://bib-pubdb1.desy.de/record/205312},
}