Contribution invited talk
Measurement of long-range correlations in Z-boson tagged pp collisions
Measurements of two-particle correlations in relative azimuthal angle and pesudorapidity have shown striking similarities between results obtained in pp, and in p+A and A+A collision systems. In pp collisions, unlike in the p+A and A+A systems, the strength of the correlations quantified by the anisotropy parameter $v_2$ does not show any dependence on the charged-particle multiplicity. Recent theoretical models suggest that this can be due to lack of correlation between the charged-particle multiplicity and the impact parameter of the pp collision. An independent handle on the impact parameter can be obtained by requiring the presence of a hard-scattering process in the collision. This talk presents the first measurement of two-particle correlations in pp collisions with a Z boson identified via its dimuon decay channel. The analysis uses ATLAS data recorded under nominal pp luminosities, and a procedure to correct for contribution of the tracks coming from pileup vertices is used. The anisotropy parameter $v_2$ measured in Z-tagged events is compared to the $v_2$ measured in minimum-bias collisions.