In clauses like "This claim is disputed." and "disputed claims", it seems that the verb "to dispute" can be used to mean that the thing we are talking about is controversial and some people disagree with it.
But in another form of the verb, disputation, it seems that (according to my searches) it does not necessarily convey that meaning (or that meaning is not common for it). What should I used instead? I want to use it in a sentence like: "The reason is that people are not aware of the existence of disputations over claims."