Re: Understanding a feature of RooFit

Hi Alberto,
On Oct 27, 2009, at 11:12 AM, Alberto Pulvirenti wrote:

> Dear all,
>
> since I have tried 10 minutes to register to the RooFit forum in
> sourceforge, and I didn't succeed, then I was forced to send my
> email here, unless there is another official support about RooFit on
> the web.

the forum for Roofit is the Stat and Math category of the ROOT forum http://root.cern.ch/phpBB2/viewforum.php?f=15

   Lorenzo

>
> I have a simple question about fitting, which comes out from the
> examples I have seen on the web site.
>
> My objective is to fit a histogram with a Breit-Wigner function, and
> there is indeed a RooBreitWigner object in the package, but I found
> that it has only two parameters: mass and gamma. On the other hand,
> I am interested also (or better, mainly) in computing the yield of
> the resonances I have counted in the historgram. In a standard Breit-
> Wigner this should be another parameter, appearing as a constant
> which multiplies the basic function. Since I don't find this
> parameter in the standard RooBreitWigner, how can I compute it after
> the fit?
>
> Thanks, best regards
>
> Alberto
>
Received on Thu Oct 29 2009 - 22:13:12 CET