I was wrong, you can do this with normal org mode commands.
C-c C-e will invoke
This brings up the
Export Dispatcher buffer. You'll notice the option for
Body Only at the top, which is toggled with
C-b. Set it to
On, and then complete your export with
l l (or whatever you like).
I'll leave my original, though now unnecessary,
pandoc solution below.
Original answer using pandoc
An inelegant solution using pandoc. From the command line, the following provides the org -> latex conversion without producing any header text:
pandoc -o file_name.tex file_name.org
This assumes your file is called "file_name.org". A bit of elisp to call this function from within Emacs, while you're visiting the file you wish to export:
(defun my-export-to-tex ()
"Export this buffer from org to latex."
(concatenate "pandoc -o "
".tex " buffer-file-name)))