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Hi all, the disagreement I showed in the last comparison data-MC in many plots (in p* spectra and mx) is due to a wrong PID killing applied at Beta level. Actually it seems that the PID killing is not applied at all for the muons. I discovered the problem just redoing the PID killing at root code level (anaRecoil) and comparing. In http://www.slac.stanford.edu/~daniele/test2/test2-comp.html you find the comparison between the MC with the PID killing at Beta level and the MC with PID killing at anaRecoil level. 1) muons: difference is dramatic. Probably the PID killing was not applied at all. 2) electrons: no striking differences In http://www.slac.stanford.edu/~daniele/testdatanew/testdata-comp.html you can find the new comparison data - MC (using the PID killing at root code level). (to be compared with the old http://www.slac.stanford.edu/BFROOT/www/Physics/Analysis/AWG/InclusiveSL/islrecoil/datacock0825_56fb-1/datacock0825_56fb-1-comp.html) All the MC needs to be rerun. We should understand how this problem could happen and why the tags we are using are not correct. Daniele