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A key observable for understanding the quarkonium production mechanism is the associated production of a vector boson with heavy quarkonia. ATLAS Collaboration in LHC observed the associated production of prompt and non-prompt J/ψ mesons with Z boson with 5σ and 9σ signifance respectively. In this poster the measurement of the production rate of Z + J/ψ over inclusive Z is discussed. Additionally, contributions from single and double parton interactions are evaluated and the results are compared to latest theoretical calculations in the colour singlet and colour octet formalisms. Finally, a lower limit in the double parton scattering effective cross section is extracted.

Observation and measurements of the production of prompt and non-prompt J/psi mesons in association with a Z boson in pp collisions at √s = 8 TeV with the ATLAS detector