How should one present research done in a CV to a graduate program in mathematics?
There are some general ideas about what is "standard" to include in CVs, but they only go so far: you still have some leeway on what to include and how to include it.  

It is fine to give a brief description (e.g. the abstract) of your works on your CV.  You should certainly also include all of your collaborators!  Either way, you should take some space in your "personal statement" (a bit of a misnomer -- it should be a "professional statement," not e.g. a narrative about how you came to love mathematics) to describe this work.  

Finally, for what it's worth -- I was familiar with your paper on quadratic forms, and I just looked back at it again.  I wouldn't quite describe it as "analytic number theory."  It has some analytic number theory, some computational number theory and some, well, quadratic form theory (that's on the algebraic side of number theory but I wouldn't quite describe it as "algebraic number theory").