There seems to be quite a bit. But most credible articles (haven't tried Google Scholars yet) point to there being no clear "winner." The overall consensus is that we should just be DST year round or not have it.

http://www.history.com/news/8-things-you-may-not-know-about-...

http://gothamist.com/2014/03/08/22_reasons_why_daylight_savi...