Re: pi0 reconstruction

[Matthew Shepherd <mashephe@indiana.edu>]

Hi Alexander,

Both the BCAL segmentation and maybe the BCAL response has changed  
since we tuned the BCAL reconstruction and "froze" it some time ago  
for the studies done for the calorimetry review.  One thing that needs  
to be done is to look at the results of the BCAL beam test and make  
sure that our model for the response represents our best possible  
knowledge.  Independent of clustering, I suspect the calibration might  
be off if attention lengths or thresholds have changed.  I'm not  
surprised that you are seeing a discrepancy at this level -- in  
general we need to do a tune-up of the reconstruction code.

-Matt


On Apr 10, 2008, at 3:34 PM, Alexander Somov wrote:
> Hi Mihajlo,
>
> I have a quick question:
>
> I generate 3 GeV photons using a single
> track generator
> c particle  momentum   theta  phi  delta_momentum delta_theta  
> delta_phi
>  KINE   101    3.0        70.    0.      0.              0.001   360.
>
> and obtain a 'strange' BCAL response; the total energy in the
> event obtained by summing up  DBCALMCResponse entries is
> shifted by about +150MeV (see plot attached to this mail).
>
> Do you know what the problem could be (do I miss smth, it seems that  
> there
> is no noise simulated here) ?
>
> I checked out bcal reconstruction from a repository.
>
>
> Thanks,
>       Sascha
>
>
> <gamma_3gev_70deg.ps>