Search for a heavy neutral particle decaying into an electron and a muon using 1 fb(-1) of ATLAS data RID A-4857-2011 RID A-9201-2012 RID B-1016-2012 RID A-6738-2012 RID A-9192-2012 RID C-1161-2011 RID B-1432-2012 RID B-6717-2011 RID C-9883-2009