Except in direct quotes the diction requirements for a research paper prohibit these kinds of language

Dialogue slang

contractions folksy

jargonfirst person second person

Some elements that should not be found in research paper (except in direct quotes, such as when one is describing people's views) are:

-second person perspective

-dialogue

- (sometimes the first person is discouraged too, but it's not a rule and it's also often used)

- slang, including contractions

-informal style generally