  The observation of long-range correlations on the near and away side -the
double ridge- in high-multiplicity p-Pb collisions at sqrt(s_NN) = 5.02 TeV and
its similarity to Pb-Pb collisions remains one of the open questions from the
p-Pb run at the Large Hadron Collider (LHC). It has been attributed to
mechanisms that involve initial-state effects, such as gluon saturation and
colour connections forming along the longitudinal direction, and final-state
effects, such as parton-induced interactions and collective effects developing
in a high-density system possibly formed in these collisions. In order to
understand the nature of this double- ridge structure the two-particle
correlation analysis has been extended to identified particles. The observed
mass dependence in p-Pb resembles the pattern observed in Pb-Pb collisions and
is compatible with expectations from hydrodynamics. The subtraction of the
long-range structures allows the study of the hadron production belonging to
the fragmentation of jets originating from low momentum-transfer scatterings
(minijets).
