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
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