I don't know about social sciences, but the situation in math isn't that far off. The short answer is that the papers done by the undergraduates are real papers but the level of papers which are of the type and quality that would be stapleable into a thesis are different (higher quality, more important results) than would be the sort done in undergraduate research.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
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