Measurement of dielectrons in pp, p(-)Pb and Pb-Pb collisions with ALICE at the LHC

Dielectrons are penetrating probes which carry unaffected information on the hot and dense medium created in ultra-relativistic heavy-ion collisions. The low-mass region of the dielectron spectrum (m(pi)(0) < m(ee) < m(p)) is sensitive to virtual photon production and in-medium modifications of low-mass vector meson spectral functions. These modifications are connected to the restoration of chiral symmetry, which is expected at high temperature. Dielectrons are also sensitive to heavy-flavor production. In these proceedings, we present the preliminary results of dielectron measurements in pp collisions at root s = 7 TeV, in p-Pb collisions at root s(NN) = 5.02 TeV and in central (0-10%) Pb-Pb collisions at root s(NN) = 2.76 TeV with the ALICE experiment at the LHC. The expected scenario and perspectives for the dielectron measurement after the ALICE upgrade are also discussed