  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 for a broad class of supersymmetric models, and
for a wide range of values of several $\l '_{ijk}$ coupling constants. Within
the MSSM, the production of a 900 GeV sneutrino for
$\lambda^{\prime}_{211}>0.05$, and of a 350 GeV sneutrino for
$\lambda^{\prime}_{211}>0.01$ can be observed within the first three years of
LHC running.
