As is seen in the post below, there is an excess of soft muons at high pTrel relative to what is expected from the SM MC.  Here I put some further plots examining this anomaly.

First we have the 2d pTrel vs. d0 plot to see if these high pTrel tracks also have high impact parameter.

They do not.  Next we look at run dependence.

No run dependence is observed.  The next plot compares the distribution of pTrel in postively charged soft muons to negatively charged soft muons.

Both distributions have a tail.  Finally we look at pTrel vs. dphi with respect to the high pT trigger muon.

The high pTrel tracks are going in the same direction or back-to-back with the trigger muon.