The research is very easy to find--Google "research on tracking." Here's one that came up right off:

Research Overwhelmingly Counsels an End to Tracking:
http://nepc.colorado.edu/newsletter/2013/05/options-tracking

What I find of note in the research is that tracking appears to have negative effects not because tailoring instruction is bad, per se, but because when you track, other bad things happen (good teachers prefer higher tracks, parents with higher-track kids are better at demanding good education).

I should say, there has been a recent backlash to the anti-tracking school of thought.