CERN-affiliated authors are intended as Staff, Fellows, and those collaborators authorized by their respective Department Heads to use the CERN affiliation, e.g. some scientific visitors, under certain conditions.
A CERN author is any author who, at the time the work described was carried out, as defined in CERN Operational Circular 6, is/was:
a) Staff member or Fellow (Staff Rules, Article I 2.02 a), not on special leave (Staff Regulations, Article R II 4.29); or,
b) an Associated member of the personnel (Staff Rules, Article I 2.02 b) allowed by their Division Leader (i.e. Department Head) to use CERN as their affiliation on the document.