[g13] theta-phi distributions

[Pawel Nadel-Turonski]

  Hi Slava,

If you require only single tracks, your distributions are very sensitive 
to the trigger (TOF and ST) and reconstruction (DC, etc) efficiencies in 
various parts of the detector. When you require more than one track, 
this to some extent gets "averaged out". It would be very interesting if 
you were able to normalize these distributions between sectors and 
determine if you see an excess or an inefficiency.

A small caveat is that with linearly polarized photons you do not expect 
symmetric phi distributions. The fact that you mix PERP, PARA, and AMO, 
and that you don't see this in other sectors suggests that physics may 
be a minor effect, but at least it may be worth checking.

Cheers,

     Pawel


On 8/13/2010 4:59 PM, slava at jlab.org wrote:
>> Is this g13b data?
> yes
>
>> What run numbers?
> 54325 - 54498
>
>> What is your event topology?
>> Is this within a specific reaction, or are you requiring some minimum
>> number of detected tracks?
> Do not care to all. Individual particles identified.
>
> Actually, for 2 exclusive events that I tried plotting, this "skewness" is
> not present. Thus, only seen in individual particle distributions so far
>
>> Does this show up at all in any other
>> sectors?
> I can responsibly speak only of these 2.
>
> Slava
>
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