Two-particle correlations in pp collisions at the LHC with ALICE

The double ridge structure previously observed in Pb-Pb[1,2,3] collisions has also been recently observed in high-multiplicity p-Pb collisions at $\sqrt{s_{NN}}$ = 5.02 TeV [4,5]. These systems show a long-range structure (large separation in $\Delta\eta$) at the near-side ($\Delta\varphi~\simeq$ 0) and away-side ($\Delta\varphi~\simeq \pi$) of the trigger particle. In order to test whether this near side structure is specific to heavy ion collisions the same analysis was done for pp collisions. Multiplicity classes were selected through looking at the multplicity in the forward region in the VZERO detector.