Multiplicity dependence of transverse momentum correlations in p-Pb and Pb-Pb collisions in ALICE

Two-particle correlations provide information about particle production mechanisms in heavy-ion collisions. We report on the study of two particle number correlations (R(2)) and transverse momentum correlations (Δp(T)Δp(T)) in Pb-Pb collisions at $\sqrt{s_{NN}}$ = 2.76 TeV and in p-Pb collisions at $\sqrt{s_{NN}}$ = 5.02 TeV measured with ALICE detector at the LHC. We study the evolution of both correlation functions with collision centrality and particle multiplicity and find they exhibit a strong dependence on either the centrality in Pb-Pb collisions or the multiplicity in p-Pb collisions. We present studies of pseudorapidity dependent Fourier decompositions of these correlation functions. Given that the details of the collision dynamics may depend on the charge of the particles, we analyze like-sign and unlike-sign particle pairs separately. We combine the correlation functions of like-sign and unlike-sign to obtain a charge independent function. The positive correlation of Δp(T)Δp(T) indicates that both particles from a pair are more likely to have momentum above or below the average transverse momentum in an event ensemble.