  Forward-backward (FB) correlations are considered to be a powerful tool for
the exploration of the early dynamics of hadronic interactions. The FB
correlation functions can be constructed from different observables calculated
event-by-event in two separated pseudorapidity regions. We report measurements
of event-by-event average transverse momentum correlations for charged
particles in two separated pseudorapidity regions in Pb-Pb collisions at
$\sqrt{s_{\rm NN}}=2.76$ and 5.02 TeV recorded with ALICE at the LHC. The
event-by-event mean transverse momenta correlations are robust against volume
fluctuations and thus the centrality determination methods, which provides
higher sensitivity to the properties of the initial state and evolution of the
medium created in A-A collisions. The strength of the FB correlation is
calculated for different centralities of the Pb-Pb collisions. Results are
compared with Monte Carlo event generators, such as HIJING and AMPT.
