As usual for wild-eyed headlines like this, it's not quite what it sounds like. This is condensed-matter physics: These aren't "particles" in the usual sense, and they don't exist by themselves in free space. They are more like "particle analogs", which exist as excitations of some underlying matter.

These are "particles" in the same way that we talk about "holes" in semiconductors like they're particles. I.e. "sort of, and for all practical purposes within the relevant domain, but not exactly."