As to unlock the privilege to directly submit a paper 50 rep points are needed, upon filling out the form that appears when clicking the button "Submit a paper", a corresponding answer to our list of submission creation requests was posted
as an intermediate state.
To finally submit it to PhysicsOverflow, a user with at least 50 points rep has to fill the form again, which I just did.
I also edited your answert to the list of submission creation requests by inserting [SUBMITTED] together with a link to the PO submission. My editing of your answer should also give you a yellow notification in the top-level menu bar when you come back to the site.
Otherwise there are no email sent after posting an answert to the list of sumbission creation requests or when the submission is finally created.