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Hi,

 I studied a bit more in detail the excess in the Mx distribution that
causes the slope in the Mx scan.

 I remind you that:

 - the excess is in the range 1.5-1.8 GeV
 - the excess is present only for B0's
 - the excess affects only one multiplicity category
    * N chg in the X system = 1,2
    * N neu in the X system > 0


 I produced the data-MC comparisons for two different tests:

 - cut on Mx:  1.1<Mx<1.8GeV
 - nchg=1,2 nneu>0

 Here the results:


  1.1<Mx<1.8GeV
  -------------

  All
  http://www.slac.stanford.edu/~daniele/vub/mx1.1-1.8/mx1.1-1.8-comp.html

  B0
  http://www.slac.stanford.edu/~daniele/vub/B0mx1.1-1.8/B0mx1.1-1.8-comp.html

  Bch
  http://www.slac.stanford.edu/~daniele/vub/Bchmx1.1-1.8/Bchmx1.1-1.8-comp.html


  nchg=1,2 nneu>0
  ---------------

  All
  http://www.slac.stanford.edu/~daniele/vub/cate5/ch1-2ne1-comp.html

  B0
  http://www.slac.stanford.edu/~daniele/vub/B0cate5/B0ch1-2ne1-comp.html

  Bch
  http://www.slac.stanford.edu/~daniele/vub/Bchcate5/Bchch1-2ne1-comp.html


  Look at the plots normalized to the semileptonic events since it is
easier to see an excess.


  My comments are:

  * for 1.1<Mx<1.8GeV

   - Bch is ok almost for all variables
   - B0  nchg shows an excess for nchg = 2 as expected
         nneu shows an excess for high values
         eneu has a peak around 1.5!!!

  * for nchg=1,2 nneu>0

   - Bch is ok almost for all variables
   - B0  nneu shows an excess for high values
         p* has a peak at high values!!
         eneu has still an excess at 1.5



   Daniele