Is there a synonym for participant suitable for a research paper? I have seen words such as colleague, member, party, etc. in various thesauruses, but these do not fit with the meaning I am trying to convey. I am looking at using participant as “someone who participated in an experiment”.
If your question concerns a scientific paper, we usually have the main researcher whom we refer to as the "author" and all other researchers are called the "co-authors". "Contributors" would be those who help you carry out your research project, with financial, logistical, structural or any other form of support.
A suitable word would be partaker. Definition here: http://dictionary.reference.com/browse/partaker
Example: They partook in an experiment that....