Re: pi0 reconstruction (fwd)

[Alexander Somov <somov@jlab.org>]

Hi Mihajlo,

It's me again, I forgot to mention:
I use a 3GeV photons as an 'extreme' case.
I see the shifts between reconstructed and generated
energies for 0.5 and 1 GeV  photons as well
(about +20 MeV and +50 MeV, respectively).

Cheers,
       Sascha


---------- Forwarded message ----------
Date: Thu, 10 Apr 2008 15:34:18 -0400 (EDT)
From: Alexander Somov <somov@jlab.org>
To: "Kornicer, Mihajlo" <mikornic@indiana.edu>
Cc: halld-cal@jlab.org
Subject: Re: pi0 reconstruction

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