[Primex2] Found possible dead e-chanel in all compton runs

[Jing Feng]

Then I need to make this 6 channels dead in the MC simulation to get a correct efficiency for real data?
Thanks!
Jing  

----- Original Message -----
From: "Eugene Pasyuk" <pasyuk at jlab.org>
To: "Jing Feng" <fengj at jlab.org>
Sent: Tuesday, November 11, 2014 2:06:30 PM
Subject: Re: [Primex2] Found possible dead e-chanel in all compton runs

If everything is done  properly this should not affect cross section. Missing counters don't contribute to the yield and they also don't contribute to the flux. This cancels out in cross section. Franz is right, e-counters are read out by a single tube. T-counters have two tubes.

-Eugene

----- Original Message -----
> From: "Jing Feng" <fengj at jlab.org>
> To: primex2 at jlab.org
> Sent: Monday, November 10, 2014 7:29:00 PM
> Subject: [Primex2] Found possible dead e-chanel in all compton runs
> 
> Dear all and Ilya,
> Please see the picture attached. All the compton runs have the
> problem of several e Channels dead(120/121/126/127/167/168). That
> may cause our yields lower than anticipation.Please commend on
> possible influence and remedy on our CS. I've just think of photon
> flux, MC simulation. If the problem also stay in pi0, we should also
> pay attention. 6 echannel is 1/30 of our numbers.more than 3%
> percent roughly.
> Thanks
> Jing
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