[Primexd] [Revised Logentry] Accidentals in tagger, Be target

[Gan, Liping]

Hi, Ashot,


I think that we need look at the accidental levels for both PS trigger and main trigger. PS contributes to the flux and main trigger contributes to the eta yield.


Liping



________________________________
From: Primexd <primexd-bounces at jlab.org> on behalf of gasparan at jlab.org <gasparan at jlab.org>
Sent: Monday, March 25, 2019 10:43:05 PM
To: somov at jlab.org
Cc: primexd at jlab.org
Subject: Re: [Primexd] [Revised Logentry] Accidentals in tagger, Be target


  Sasha,
 Though it may not be much different but, it would be better to use
 our experimental trigger instead of the PS trigger.

 Thanks,
 Ashot

>
> Logentry Text:
> --
> Some quick (rough) estimates of the fraction of accidental hits in the
> tagger (denoted as bg/sig in Fig. 2).
>
> 1. Consider PS trigger. Search for hits in the tagger around the PS energy
> in the window +- 1 GeV
>
> 2. Count number of hits correlated with the trigger time (signal).
> Determine accidentals
> from the side band of the time distribution (see Fig. 1). Subtract
> accidentals
>
> 3. Fig. 2: fraction of accidental hits (in a  +- 1 GeV energy window) in
> the tagger as a function of the tagger energy
>
> I'll  check it later, just scratched the surface now.
>
>
>
> ---
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