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

Tue Mar 26 09:12:42 EDT 2019

Hi all,

I agree it would good to look at the accidental rates for both triggers. For the spectroscopy program, we see the accidental rate depends on several factors, such as reaction topology, beam energy, event selection, etc

Cheers
Sean

On Mon, Mar 25, 2019 at 11:00 PM Gan, Liping <ganl at uncw.edu<mailto:ganl at uncw.edu>> wrote:

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<mailto:primexd-bounces at jlab.org>> on behalf of gasparan at jlab.org<mailto:gasparan at jlab.org> <gasparan at jlab.org<mailto:gasparan at jlab.org>>
Sent: Monday, March 25, 2019 10:43:05 PM
To: somov at jlab.org<mailto:somov at jlab.org>
Cc: primexd at jlab.org<mailto: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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