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<div dir="auto">Hi all,</div>
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<div dir="auto">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</div>
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<div dir="auto">Cheers</div>
<div dir="auto">Sean</div>
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<div dir="ltr" class="gmail_attr">On Mon, Mar 25, 2019 at 11:00 PM Gan, Liping <<a href="mailto:ganl@uncw.edu">ganl@uncw.edu</a>> wrote:<br>
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<p style="margin-top:0;margin-bottom:0">Hi, Ashot,</p>
<p style="margin-top:0;margin-bottom:0"><br>
</p>
<p style="margin-top:0;margin-bottom:0">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.</p>
<p style="margin-top:0;margin-bottom:0"><br>
</p>
<p style="margin-top:0;margin-bottom:0">Liping</p>
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<div id="m_4269560736082685540divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Primexd <<a href="mailto:primexd-bounces@jlab.org" target="_blank">primexd-bounces@jlab.org</a>> on behalf of
<a href="mailto:gasparan@jlab.org" target="_blank">gasparan@jlab.org</a> <<a href="mailto:gasparan@jlab.org" target="_blank">gasparan@jlab.org</a>><br>
<b>Sent:</b> Monday, March 25, 2019 10:43:05 PM<br>
<b>To:</b> <a href="mailto:somov@jlab.org" target="_blank">somov@jlab.org</a><br>
<b>Cc:</b> <a href="mailto:primexd@jlab.org" target="_blank">primexd@jlab.org</a><br>
<b>Subject:</b> Re: [Primexd] [Revised Logentry] Accidentals in tagger, Be target</font>
<div> </div>
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<div class="m_4269560736082685540BodyFragment"><font size="2"><span style="font-size:11pt">
<div class="m_4269560736082685540PlainText"><br>
Sasha,<br>
Though it may not be much different but, it would be better to use<br>
our experimental trigger instead of the PS trigger.<br>
<br>
Thanks,<br>
Ashot<br>
<br>
><br>
> Logentry Text:<br>
> --<br>
> Some quick (rough) estimates of the fraction of accidental hits in the<br>
> tagger (denoted as bg/sig in Fig. 2).<br>
><br>
> 1. Consider PS trigger. Search for hits in the tagger around the PS energy<br>
> in the window +- 1 GeV<br>
><br>
> 2. Count number of hits correlated with the trigger time (signal).<br>
> Determine accidentals<br>
> from the side band of the time distribution (see Fig. 1). Subtract<br>
> accidentals<br>
><br>
> 3. Fig. 2: fraction of accidental hits (in a +- 1 GeV energy window) in<br>
> the tagger as a function of the tagger energy<br>
><br>
> I'll check it later, just scratched the surface now.<br>
><br>
><br>
><br>
> ---<br>
><br>
> This is a plain text email for clients that cannot display HTML. The full<br>
> logentry can be found online at<br>
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