Get username and/or IP address responsible for a query

Question

I use the following query to find performance improvements in queries:

SELECT TOP 20 SUBSTRING(qt.text, (qs.statement_start_offset/2)+1, 
        ((CASE qs.statement_end_offset
          WHEN -1 THEN DATALENGTH(qt.text)
         ELSE qs.statement_end_offset
         END - qs.statement_start_offset)/2)+1),
  qs.execution_count,
  qs.total_logical_reads, qs.last_logical_reads, qs.min_logical_reads,
  qs.max_logical_reads, qs.total_physical_reads, qs.last_physical_reads,
  qs.min_physical_reads, qs.max_physical_reads,
  qs.total_elapsed_time / 1000000 As total_elapsed_time, 
  qs.last_elapsed_time / 1000000 As last_elapsed_time,
  qs.min_elapsed_time / 1000000 As min_elapsed_time, 
  qs.max_elapsed_time / 1000000 As max_elapsed_time,
  qs.last_execution_time, qs.creation_time, qp.query_plan
FROM sys.dm_exec_query_stats qs
CROSS APPLY sys.dm_exec_sql_text(qs.sql_handle) qt
CROSS APPLY sys.dm_exec_query_plan(qs.plan_handle) qp
WHERE qt.encrypted=0
AND last_execution_time >= DATEADD (MINUTE , -5 , CURRENT_TIMESTAMP )
ORDER BY qs.total_logical_reads DESC
--ORDER BY qs.total_physical_reads DESC

The issue is that I've found a query that appears to be thrown repeatedly from time to time and requires enhancement, but I'm not able to determine where it comes from (could be a user or a program, but in any case should have a login or username). How can I get this user or track this query so I can apply improvements to it?