select * FROM sys.dm_tran_session_transactions AS tst
INNER JOIN sys.dm_tran_active_transactions AS tat
ON tst.transaction_id = tat.transaction_id
INNER JOIN sys.dm_tran_database_transactions AS tdt
ON tst.transaction_id = tdt.transaction_id
INNER JOIN sys.dm_exec_sessions es
ON tst.session_id = es.session_id
INNER JOIN sys.dm_exec_requests er
ON tst.session_id = er.session_id
CROSS APPLY sys.dm_exec_sql_text(er.sql_handle) TXT
http://www.sqlservercentral.com/articles/Transaction+Log/122600/