If you are looking for the GATHER_STATS_JOB in Oracle 11g, then stop looking.  In 11g, this job is part of the daily Oracle Maintenance window, but it is executed as an autotask.  Take a look at this Oracle link.

To check if it exists and enabled, use this simple SQL.

select * from dba_autotask_client where client_name = ‘auto optimizer stats collection’;

Or, to check the log:

select count(*) from dba_scheduler_job_log where additional_info like ‘%GATHER_STATS_PROG%’;

I hope this will save you some [research] time.