Hoi Alessio,

very nice talk! Here are just a few nit-picking comments:

p2: "model dep." not due to mb, a parameters, but rather due to shape
    function parametrization. The parameters per se are HQET "theory"
    parameters, not a model. But the specific form of SF
    parametrization in deFazio/Neubert is a model. Which is THE reason
    why we want to avoid a dependency on the SF.

p4: I would flip the x-y axes for the "correlation" plot, then it's
    the same as other people use, e.g. in the canonical plot of
    Bauer/Ligeti (Fig 1 of ph/0107074). I think in general this is
    called a "Dalitz" plot, not a "correlation" plot.

p5: I do not think that we need to go as high as 10 GeV2. In fact, IF
    we want to put out a result as soon as possible with minimal
    changes, I would argue that the q2 cut should be relatively low,
    with higher mX cuts than what we have done so far. See e.g. table
    I in ph/0107074.

    Why 10Gev2?

    I have to admit that I have not yet clicked through all the links
    in your webpage, I don't know whether you have done this. Ed has
    produced scans in the (mX, Q2) plane.
   
p6: I think that this should be a 2-d scan in (mX,q2), not just a 1-d
    scan. You must look at different combinations.
 
    Not only "sys" reduction, but "sys^2 + theo^2". We will not gain
    in "sys" probably.

p7: Naive question: Why does the efficiency flatten at mX = 1.8GeV?
    Applying a q2 > 10 GeV2 should leave signal rate to higher mX
    (both from your plot on page 4 and from ph/0107074).

    Again, I think that it should be a 2-d scan of the error not only
    vs. q2, but in the full (q2,mX) plane.

p8: By now I think I was confusd and what you call "sys" is actually
    "theo"; OK...

p9: I would propose that we very seriously consider switching to the
    non-resonant as "default" signal MC. Of course we need to
    understand the behavior of the error on the hybrid MC.

p10 I would feel (very) uncomfortable to extract mb from a spectrum
    that shows a disagreement between the model and data as shown in
    the bottom left two plots.

    Before we do that we should be sure that e.g. changing neutrals
    selection and tracking has a very small effect on this. There is
    work ongoing by Jonathan Coleman which we should look at. I
    consider this one of the more important improvements (on a time
    scale longer than this summer) for the incl b2u analyses.

p12 Again, I personally would not claim that we can extract mb from
    the mX distribution to 80MeV.

p18 "1." I would maybe say that we need to understand the hybrid MC
    "For this summer 2." I would say we need to validate the spectra
    other than mX given from the fit.

That's all for now.

Cheers,
--U.