  The resonant production of sneutrinos at the LHC via the R-parity violating
couplings $\l '_{ijk} L_i Q_j D^c_k$ is studied through its three-leptons
signature. A detailed particle level study of signal and background is
performed using a fast simulation of the ATLAS detector. Through the full
reconstruction of the cascade decay, a model-independent and precise
measurement of the masses of the involved sparticles can be performed. Besides,
this signature can be detected in a large part of the SUSY parameter space and
for wide ranges of values of several $\l '_{ijk}$ coupling constants.
