A research paper is not a simple summarized has a complete information about your topic...Its not only the primary sources but also the secondary may be a book report,an essay, etc
I think that a research paper is an expanded essay that presents your own interpretation or evaluation or argument. ..

When you write an essay, you use everything that you personally know and have thought about a subject. ...

When writing a research paper you build upon what you know about the subject and make a deliberate attempt to find out what experts know. ...
so basically it's just based on what you know and what  you have thought