<html><head><meta http-equiv="Content-Type" content="text/html charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">FX,<div class=""><br class=""></div><div class="">Can you please clarify what you are exactly asking. The DC roads or segments in the trigger have nothing to do with trigger efficiency dependance on ECal trigger threshold. If you worry about efficiency of DC segments or roads for low momentum (~1 GeV) electrons or tracks, Andrea did that studies and as far I remember trigger had almost 100% efficiency.</div><div class=""><br class=""></div><div class="">Stepan</div><div class=""> <br class=""><div><blockquote type="cite" class=""><div class="">On Dec 12, 2018, at 7:35 PM, Francois-Xavier Girod <<a href="mailto:fxgirod@jlab.org" class="">fxgirod@jlab.org</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><meta http-equiv="Content-Type" content="text/html; charset=utf-8" class=""><div dir="ltr" class="">Thank you Rafo, this is really helpful<div class="">I remember we did have a separate validation of the DC roads. Do you have this documented? I think this included both simulations and data, but I don't remember the momentum range. I think the DC roads can validated at low momentum even with a 300 MeV threshold.</div></div><br class=""><div class="gmail_quote"><div dir="ltr" class="">On Wed, Dec 12, 2018 at 7:30 PM Rafayel Paremuzyan <<a href="mailto:rafopar@jlab.org" class="">rafopar@jlab.org</a>> wrote:<br class=""></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div bgcolor="#FFFFFF" class="">
Dear Fx, all,<br class="">
<br class="">
I looked back one of old presentations, and see that with 2.2 GeV
run that we have in Jan 2018, the ESum threshold was 150 MeV<br class="">
<a class="gmail-m_-3435344956483943303moz-txt-link-freetext" href="https://docs.google.com/presentation/d/1OZ_BDsYiH6t8Mo_D_o9QPIoSQLKkvs7ckKwGx_u9vOs/edit?usp=sharing" target="_blank">https://docs.google.com/presentation/d/1OZ_BDsYiH6t8Mo_D_o9QPIoSQLKkvs7ckKwGx_u9vOs/edit?usp=sharing</a><br class="">
Please look into slide 11, the sharp fall of the trigger is below P
< 1 GeV.<br class="">
<br class="">
This is not exactly the same this trigger, but difference is minor,
i.e. DC segments are added, then dc roads, and<br class="">
because of it some time constants were shifted. This gives good
confidence that the current trigger is also efficient (99%+) above 1
GeV,<br class="">
however, if you would like exactly this trigger to be validated 1ith
ESum > 150 MeV, we can take another random run (about 2 hours g/
good beam),<br class="">
and check it.<br class="">
<br class="">
Rafo<br class="">
<br class="">
<br class="">
<div class="gmail-m_-3435344956483943303moz-cite-prefix">On 12/12/18 7:05 PM, Viktor Mokeev
wrote:<br class="">
</div>
<blockquote type="cite" class="">
<div id="gmail-m_-3435344956483943303divtagdefaultwrapper" style="font-size: 12pt; font-family: Calibri, Helvetica, sans-serif;" dir="ltr" class=""><div style="margin-top: 0px; margin-bottom: 0px;" class="">Thank you FX for the
comment!</div><div style="margin-top: 0px; margin-bottom: 0px;" class=""><br class="">
</div><div style="margin-top: 0px; margin-bottom: 0px;" class="">Extension of W-coverage
may be also beneficial increasing chances to explore the
hybrid baryon spectrum.</div><div style="margin-top: 0px; margin-bottom: 0px;" class=""><br class="">
</div><div style="margin-top: 0px; margin-bottom: 0px;" class=""> Best Regards,</div><div style="margin-top: 0px; margin-bottom: 0px;" class="">
Victor<br class="">
</div><div style="margin-top: 0px; margin-bottom: 0px;" class=""><br class="">
</div>
</div>
<hr style="display:inline-block;width:98%" class="">
<div id="gmail-m_-3435344956483943303divRplyFwdMsg" dir="ltr" class=""><font style="font-size:11pt" face="Calibri, sans-serif" class=""><b class="">From:</b>
Francois-Xavier Girod <a class="gmail-m_-3435344956483943303moz-txt-link-rfc2396E" href="mailto:fxgirod@jlab.org" target="_blank"><fxgirod@jlab.org></a><br class="">
<b class="">Sent:</b> Wednesday, December 12, 2018 7:00:36 PM<br class="">
<b class="">To:</b> Viktor Mokeev<br class="">
<b class="">Cc:</b> clas12 rgk; clas12 first exp; Rafayel Paremuzyan<br class="">
<b class="">Subject:</b> Re: [clas12_rgk] trigger efficiency vs ECal
treshold</font>
<div class=""> </div>
</div>
<div class="">
<div dir="ltr" class="">Dear Viktor
<div class=""><br class="">
</div>
<div class="">Thanks for the feedback. Although hybrid baryon is not
interested in the high W region, lowering the trigger
threshold for hybrid baryon would only impact the experiment
in terms of luminosity. The lower W / larger momentum region
would still be in the trigger, and hybrid baryon could
benefit from cross-checking their cross-sections at
different luminosity. </div>
<div class=""><br class="">
</div>
<div class="">Best regards</div>
<div class="">FX</div>
</div>
<br class="">
<div class="gmail-m_-3435344956483943303x_gmail_quote">
<div dir="ltr" class="">On Wed, Dec 12, 2018 at 6:26 PM Viktor Mokeev
<<a href="mailto:mokeev@jlab.org" target="_blank" class="">mokeev@jlab.org</a>>
wrote:<br class="">
</div>
<blockquote class="gmail-m_-3435344956483943303x_gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div dir="ltr" class="">
<div id="gmail-m_-3435344956483943303x_gmail-m_-59478190252913499divtagdefaultwrapper" dir="ltr" style="font-size: 12pt; font-family: Calibri, Helvetica, sans-serif;" class=""><div style="margin-top: 0px; margin-bottom: 0px;" class="">Dear All,</div><div style="margin-top: 0px; margin-bottom: 0px;" class=""><br class="">
</div><div style="margin-top: 0px; margin-bottom: 0px;" class=""> From FX
trigger efficiency plot, I see efficiency problems at
the lab. energies of the scattered electron <2.0
GeV or for \nu value above 5.5 GeV for the electron
beam energy 7.5 GeV. It corresponds to the following W
ranges where we have the problem with trigger
efficiency:</div><div style="margin-top: 0px; margin-bottom: 0px;" class=""><br class="">
</div><div style="margin-top: 0px; margin-bottom: 0px;" class="">Q^2=2.0
GeV^2 W>3.0 GeV</div><div style="margin-top: 0px; margin-bottom: 0px;" class="">Q^2=5.0
GeV^2 W>2.5 GeV</div><div style="margin-top: 0px; margin-bottom: 0px;" class=""><br class="">
</div><div style="margin-top: 0px; margin-bottom: 0px;" class="">For hybrid
baryon search, we have no any problem with the trigger
efficiency at Q^2<2.0 GeV^2 since the lightest
hybrids are expected in the mass range <2.5 GeV.
Furthermore, the initial search for hybrid baryons
will be carried out at Q^2<2.0 GeV^2.</div><div style="margin-top: 0px; margin-bottom: 0px;" class=""><br class="">
</div><div style="margin-top: 0px; margin-bottom: 0px;" class=""> Best
Regards,</div><div style="margin-top: 0px; margin-bottom: 0px;" class="">
Victor<br class="">
</div><div style="margin-top: 0px; margin-bottom: 0px;" class=""><br class="">
</div>
</div>
<hr style="display:inline-block;width:98%" class="">
<div id="gmail-m_-3435344956483943303x_gmail-m_-59478190252913499divRplyFwdMsg" dir="ltr" class=""><font style="font-size:11pt" face="Calibri,
sans-serif" class=""><b class="">From:</b>
Francois-Xavier Girod <<a href="mailto:fxgirod@jlab.org" target="_blank" class="">fxgirod@jlab.org</a>><br class="">
<b class="">Sent:</b> Wednesday, December 12, 2018 6:09:53 PM<br class="">
<b class="">To:</b> Viktor Mokeev<br class="">
<b class="">Cc:</b> clas12 rgk; clas12 first exp; Rafayel
Paremuzyan<br class="">
<b class="">Subject:</b> Re: [clas12_rgk] trigger efficiency vs
ECal treshold</font>
<div class=""> </div>
</div>
<div class="">
<div dir="ltr" class="">Dear Viktor
<div class=""><br class="">
</div>
<div class="">Rafo can confirmed as he produced the plot, my
understanding is that the electron momentum is
measured by the drift chambers</div>
<div class=""><br class="">
</div>
<div class="">Best regards</div>
<div class="">FX</div>
</div>
<br class="">
<div class="gmail-m_-3435344956483943303x_gmail-m_-59478190252913499x_gmail_quote">
<div dir="ltr" class="">On Wed, Dec 12, 2018 at 6:08 PM Viktor
Mokeev <<a href="mailto:mokeev@jlab.org" target="_blank" class="">mokeev@jlab.org</a>>
wrote:<br class="">
</div>
<blockquote class="gmail-m_-3435344956483943303x_gmail-m_-59478190252913499x_gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div dir="ltr" class="">
<div id="gmail-m_-3435344956483943303x_gmail-m_-59478190252913499x_gmail-m_1622187504078827668divtagdefaultwrapper" dir="ltr" style="font-size: 12pt; font-family: Calibri, Helvetica, sans-serif;" class=""><div style="margin-top: 0px; margin-bottom: 0px;" class="">Dear
FX,</div><div style="margin-top: 0px; margin-bottom: 0px;" class=""><br class="">
</div><div style="margin-top: 0px; margin-bottom: 0px;" class=""> Just
to make sure, whether P on your plots is the
energy=momentum of the scattered electron?</div><div style="margin-top: 0px; margin-bottom: 0px;" class=""><br class="">
</div><div style="margin-top: 0px; margin-bottom: 0px;" class="">Best
Regards,</div><div style="margin-top: 0px; margin-bottom: 0px;" class="">
Victor<br class="">
</div>
</div>
<hr style="display:inline-block;width:98%" class="">
<div id="gmail-m_-3435344956483943303x_gmail-m_-59478190252913499x_gmail-m_1622187504078827668divRplyFwdMsg" dir="ltr" class="">
<font style="font-size:11pt" face="Calibri,
sans-serif" class=""><b class="">From:</b>
clas12_rgk <<a href="mailto:clas12_rgk-bounces@jlab.org" target="_blank" class="">clas12_rgk-bounces@jlab.org</a>>
on behalf of Francois-Xavier Girod <<a href="mailto:fxgirod@jlab.org" target="_blank" class="">fxgirod@jlab.org</a>><br class="">
<b class="">Sent:</b> Wednesday, December 12, 2018
5:58:01 PM<br class="">
<b class="">To:</b> clas12 rgk; <a href="mailto:clas12_first_exp@jlab.org" target="_blank" class="">
clas12_first_exp@jlab.org</a><br class="">
<b class="">Cc:</b> Rafayel Paremuzyan<br class="">
<b class="">Subject:</b> [clas12_rgk] trigger
efficiency vs ECal treshold</font>
<div class=""> </div>
</div>
<div class="">
<div dir="ltr" class="">
<div dir="ltr" class="">
<div dir="ltr" class="">Dear all
<div class=""><br class="">
</div>
<div class="">During today's meeting I attempted to
have a discussion on the trigger
efficiency as function of ECal
threshold. Contradicting statements were
made during the meeting, so I want this
discussion to be on record here.</div>
<div class=""><br class="">
</div>
<div class="">Please see the plot</div>
<div class=""><br class="">
</div>
<div class=""><a href="https://www.jlab.org/Hall-B/secure/clas12/rec_mon/P_Good_emWithEC_5786.png" target="_blank" class="">https://www.jlab.org/Hall-B/secure/clas12/rec_mon/P_Good_emWithEC_5786.png</a><br class="">
</div>
<div class=""><br class="">
</div>
<div class="">from Rafo's study of the trigger
efficiency. He analyzed run 5786 which
was taken with the random trigger. </div>
<div class=""><br class="">
</div>
<div class="">- in blue all "good electrons" with
Nphe>2, E_PCal > 60 MeV, sampling
fraction > 0.2 and fiducial cuts</div>
<div class=""><br class="">
</div>
<div class="">- in orange, the electrons satisfy in
addition E_ECal > 300 MeV</div>
<div class=""><br class="">
</div>
<div class="">- in red, the events for which the
orange set was missing the electron
trigger bit</div>
<div class=""><br class="">
</div>
<div class="">The trigger efficiency is defined as
(orange - red) / orange</div>
<div class=""><br class="">
</div>
<div class=""><a href="https://www.jlab.org/Hall-B/secure/clas12/rec_mon/Eff_All_Good_em_trg_threshold_5786.png" target="_blank" class="">https://www.jlab.org/Hall-B/secure/clas12/rec_mon/Eff_All_Good_em_trg_threshold_5786.png</a><br class="">
</div>
<div class=""><br class="">
</div>
<div class="">The trigger efficiency below 2 GeV
drops rapidly, and measuring a cross
section in this region is challenging</div>
<div class=""><br class="">
</div>
<div class="">My question during the meeting was:
do we already have data to show the
trigger efficiency when the threshold is
150 MeV. My understanding is that we do
not have this data and that to answer
this question we need to take another
random trigger run with the lower
threshold.</div>
<div class=""><br class="">
</div>
<div class="">What I have in mind is the following:
I agree that the bulk of the RG-K data
taking can take place at 300 MeV ECal
trigger threshold and highest possible
luminosity, but I would like to consider
the possibility to take a few days at a
lower trigger threshold to extend the
cross section measurement to higher W.
Again my purpose is to minimize the
final systematic uncertainties.</div>
<div class=""><br class="">
</div>
<div class="">Best regards</div>
<div class="">FX</div>
</div>
</div>
</div>
</div>
</div>
</blockquote>
</div>
</div>
</div>
</blockquote>
</div>
</div>
</blockquote>
<br class="">
</div>
</blockquote></div>
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