How to restore the original head after `git-reset --hard master^`

Hi all,

   After involves the command `git-reset --hard master^` in a 
repository, the working
tree , current head and index are restored to the parent of master. That 
includes
the content of '.git/refs/head/master'. Although the original commit 
object is still existed
, I couldn't find it back.

  Is there anyway to recover the original master branch ? or I have to 
restore the branch
manually by finding out all the child of current head? If that is the 
solution , what command
could provide this information?

Thanks


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