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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 >