BA vs BPM Group

I know nothing about the corporate turf wars surrounding BPM, so I hope someone out there can help my anonymous friend, who writes:

I manage the business analyst group for our company (our firm is about $4 billion in revenue annually) ? I work in the IT department. In a different department, they thinking of forming a BPM group. I?m trying to stay proactive so that the business analysts in IT don?t get run over ...

Do you know of any material that starts to clearly differentiate what the people in a BA group do verses that of a BPM group? I want to clearly define the roles and responsibilities of each group BEFORE the BPM group is fully formed.