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We have obtained VIMOS/VLT optical integral field spectroscopy (IFS) data fora sample of 4 LIRGs which have been selected at a similar distance ($\sim$ 70Mpc) to avoid relative resolution effects. They have been classified in twogroups (isolated disk and post-coalescence mergers) according to theirmorphology. The $kinemetry$ method (developed by Krajnovic and coworkers) isused to characterize the kinematic properties of these galaxies and to discussnew criteria for distinguishing their status. We present and discuss newkinematic maps (i.e., velocity field and velocity dispersion) for these fourgalaxies. The morphological and kinematic classifications of these systems areconsistent, with disks having lower kinematic asymmetries than post-coalescencemergers. We then propose and discuss a new kinematic criterion to differentiatethese two groups. This criterion distinguishes better these two categories andhas the advantage of being less sensitive to angular resolution effects.According to the previous criteria,the present post-coalescence systems wouldhave been classified as disks. This indicates that the separation of disks frommergers is subjective to the definition of `merger'. It also suggests thatprevious estimates of the merger/disk ratio could have been underestimated, butlarger samples are necessary to establish a firmer conclusion.

Studying the kinematic asymmetries of disks and post-coalescence mergers using a new `kinemetry' criterion