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Constraints related to transformations of currents under space-timetranslations have been considered for the relativistic quantum mechanicscalculation of form factors of J=0 systems composed of scalar constituents withequal masses. Accounting for these constraints amounts to take into accountmany-body currents that restore the equality of the momentum transferredseparately to the system and to the constituents, which holds in field-theoryapproaches but is not generally fulfilled in relativistic quantum mechanicsones. When this was done, discrepancies between results from differentapproaches could be found to vanish. The results are extended here to systemscomposed of spin-1/2 constituents with unequal masses. Moreover, as far as theequivalence of different approaches is concerned, some intermediate step couldbe skipped and the presentation of these results therefore slightly differsfrom the previous one. Due to the technical aspect of present results, thiswork is not aimed to be published but it could be useful for some applicationslike the form factors of the pion or kaon particles.

Form factors in RQM approaches: constraints from space-time translations, extension to constituents with spin-1/2 and unequal masses