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The relation between the star formation rate and the stellar mass ofstar-forming galaxies has been used to argue that major mergers cannot be themain driver of star formation. Here, we re-examine these arguments using therepresentative IMAGES-CDFS sample of star-forming galaxies at z=0.4-0.75,taking advantage of their previously established classification intopre-fusion, fusion, and relaxing galaxy mergers. Contrary to previous claims,we show there is no tension between the main sequence scatter and the averageduration of the fusion star formation rate SFR peak. We confirm previousestimates of the fraction of SFR due to morphologically-selected galaxies(~23%) or the SFR enhancement due to major merger during the fusion phase(~10%). However, galaxy mergers are not instantaneous processes, which impliesthat the total fraction of the SFR associated to galaxies undergoing majormergers must account for the three merger phases. When doing so, galaxiesinvolved in major mergers are found to represent 53-88% of the total SFR atz~0.6. The fraction of LIRGs in the fusion phase is found to be in agreementwith the observed morphological fraction of LIRGs without disks and with theobserved and expected major merger rates at z<1.5.

The main sequence of star-forming galaxies at z~0.6: reinstating major mergers