===== p p > t tbar b bbar sub working group =====

  * ttbb shows large shower uncertainties, possibly from shower starting scales, and should be looked at 

  * some of the issues were summarized in Efe Yazgan's talk here https://indico.cern.ch/event/596233/timetable/

  * although this has been mentioned a few times, and there are open issues, perhaps there isn't enough interest here in Les Houches (?).

  * **If any of you has something specific in mind, please get in touch with the conveners, or edit this page.**