Hi Antonio,
On Mon, 8 May 2006, Antonio Petrella wrote:
>
> Hi,
>
> > Hi Antonio,
> >
> > that looks quite good wrt the fitted event yield on MC and also wrt to the
> > pulls in data fit. I would vote to stick to this fit configuration and
> > move on so that we can check now if a MM2 scan shows reasonable stability
> > in the BF extraction.
> >
> > A few questions:
> > 1) Do you have also a non-extended chi^2 fit on data?
>
> Francesca has asked for this too... I'm producing it
>
> > 2) I'm a bit surprised when comparing your fit on data with the plot shown
> > at April 19: The statistics is not exactly the same (order 20% difference).
> > Why is that?
>
> I think it is due to the different tuning of parameters. Looking at the
> plot of April 19th we can see that the amount of event fitted by
> crystall ball in the signal region is greater than on the last plot. So
> the number of signal events is lower.
> In addition for the fit on data of april 19th I set the endpoint for
> Argus and Cristall ball fixed, which is not so good when fitting data,
> is that right?
> So I would say that the latest fit (5 may) has more correct assumptions.
This is not exactly what I meant. The number of events in the mES peak
is different between both plots.
>
> > 3) In addition, the deviation in the plot of April 19 looks worse.
> > However, the chi^2 of that fit is significantly better compared to the
> > current number of 6.48. Do we understand why?
>
> I would say that this is due to the worsening of the fit on the
> endpoint. If you look at the pulls for the latest fit you can see that
> the latest 4 bins have higher values than the ones on the plot of 19
> April...
Sorry. I didn't look carefully enough. The scale in the pulls is
different. So, indeed the endpoint is not very well described by
the May 5th fit.
Cheers,
Heiko
> >
> > 4) Do we need a crosscheck wrt different run periods?
> > I.e. check if the machinery works when fitting on Run1/2, Run3 and
> > Run4?
> >
>
> I hope it will work even on smaller datasets! Anyway I will check!
>
>
> Ciao
> Antonio
>
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