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The Random trigger and current trigger is using DC segments only, no
roads.<br>
Especially for outbendings the gain of dc roads was minimal (1-2%)<br>
<br>
Rafo<br>
<br>
<br>
<div class="moz-cite-prefix">On 12/12/18 7:58 PM, Francois-Xavier
Girod wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAOKxh44cduSWSe1wY6KLzWLZ2USCrMH_g5i-gP=FPEo9yqRZkQ@mail.gmail.com">
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<div dir="ltr">I believed we are using the DC roads
<div>If we are not then my question is moot</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr">On Wed, Dec 12, 2018 at 7:56 PM Stepan Stepanyan
<<a href="mailto:stepanya@jlab.org" moz-do-not-send="true">stepanya@jlab.org</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div style="overflow-wrap: break-word;">I am sure you can, but
you should ask Andrea.
<div><br>
</div>
<div>Are we using roads or segment now.</div>
<div><br>
</div>
<div>Stepan</div>
<div><br>
<div>
<blockquote type="cite">
<div>On Dec 12, 2018, at 7:46 PM, Francois-Xavier
Girod <<a href="mailto:fxgirod@jlab.org"
target="_blank" moz-do-not-send="true">fxgirod@jlab.org</a>>
wrote:</div>
<br
class="gmail-m_-205057475824645956Apple-interchange-newline">
<div>
<div dir="ltr">Dear Stepan
<div><br>
</div>
<div>Yes, this is what I am asking for: can we
please have the plot showing the DC roads
efficiency vs momentum?</div>
<div>I only need this material for discussion of
my earlier proposal</div>
<div><br>
</div>
<div>Best regards</div>
<div>FX</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr">On Wed, Dec 12, 2018 at 7:42 PM
Stepan Stepanyan <<a
href="mailto:stepanya@jlab.org"
target="_blank" moz-do-not-send="true">stepanya@jlab.org</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px
0px 0px 0.8ex;border-left:1px solid
rgb(204,204,204);padding-left:1ex">
<div>FX,
<div><br>
</div>
<div>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><br>
</div>
<div>Stepan</div>
<div> <br>
<div>
<blockquote type="cite">
<div>On Dec 12, 2018, at 7:35 PM,
Francois-Xavier Girod <<a
href="mailto:fxgirod@jlab.org"
target="_blank"
moz-do-not-send="true">fxgirod@jlab.org</a>>
wrote:</div>
<br
class="gmail-m_-205057475824645956gmail-m_8193896196696387444Apple-interchange-newline">
<div>
<div dir="ltr">Thank you Rafo, this is
really helpful
<div>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>
<div class="gmail_quote">
<div dir="ltr">On Wed, Dec 12, 2018
at 7:30 PM Rafayel Paremuzyan <<a
href="mailto:rafopar@jlab.org"
target="_blank"
moz-do-not-send="true">rafopar@jlab.org</a>>
wrote:<br>
</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"> Dear Fx,
all,<br>
<br>
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>
<a
class="gmail-m_-205057475824645956gmail-m_8193896196696387444gmail-m_-3435344956483943303moz-txt-link-freetext"
href="https://docs.google.com/presentation/d/1OZ_BDsYiH6t8Mo_D_o9QPIoSQLKkvs7ckKwGx_u9vOs/edit?usp=sharing"
target="_blank"
moz-do-not-send="true">https://docs.google.com/presentation/d/1OZ_BDsYiH6t8Mo_D_o9QPIoSQLKkvs7ckKwGx_u9vOs/edit?usp=sharing</a><br>
Please look into slide 11, the
sharp fall of the trigger is
below P < 1 GeV.<br>
<br>
This is not exactly the same
this trigger, but difference is
minor, i.e. DC segments are
added, then dc roads, and<br>
because of it some time
constants were shifted. This
gives good confidence that the
current trigger is also
efficient (99%+) above 1 GeV,<br>
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>
and check it.<br>
<br>
Rafo<br>
<br>
<br>
<div
class="gmail-m_-205057475824645956gmail-m_8193896196696387444gmail-m_-3435344956483943303moz-cite-prefix">On
12/12/18 7:05 PM, Viktor
Mokeev wrote:<br>
</div>
<blockquote type="cite">
<div
id="gmail-m_-205057475824645956gmail-m_8193896196696387444gmail-m_-3435344956483943303divtagdefaultwrapper"
style="font-size:12pt;font-family:Calibri,Helvetica,sans-serif"
dir="ltr">
<div
style="margin-top:0px;margin-bottom:0px">Thank
you FX for the comment!</div>
<div
style="margin-top:0px;margin-bottom:0px"><br>
</div>
<div
style="margin-top:0px;margin-bottom:0px">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"><br>
</div>
<div
style="margin-top:0px;margin-bottom:0px"> Best
Regards,</div>
<div
style="margin-top:0px;margin-bottom:0px">
Victor<br>
</div>
<div
style="margin-top:0px;margin-bottom:0px"><br>
</div>
</div>
<hr
style="display:inline-block;width:98%">
<div
id="gmail-m_-205057475824645956gmail-m_8193896196696387444gmail-m_-3435344956483943303divRplyFwdMsg"
dir="ltr"><font
style="font-size:11pt"
face="Calibri, sans-serif"><b>From:</b>
Francois-Xavier Girod <a
class="gmail-m_-205057475824645956gmail-m_8193896196696387444gmail-m_-3435344956483943303moz-txt-link-rfc2396E"
href="mailto:fxgirod@jlab.org" target="_blank" moz-do-not-send="true"><fxgirod@jlab.org></a><br>
<b>Sent:</b> Wednesday,
December 12, 2018 7:00:36
PM<br>
<b>To:</b> Viktor Mokeev<br>
<b>Cc:</b> clas12 rgk;
clas12 first exp; Rafayel
Paremuzyan<br>
<b>Subject:</b> Re:
[clas12_rgk] trigger
efficiency vs ECal
treshold</font>
<div> </div>
</div>
<div>
<div dir="ltr">Dear Viktor
<div><br>
</div>
<div>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><br>
</div>
<div>Best regards</div>
<div>FX</div>
</div>
<br>
<div
class="gmail-m_-205057475824645956gmail-m_8193896196696387444gmail-m_-3435344956483943303x_gmail_quote">
<div dir="ltr">On Wed, Dec
12, 2018 at 6:26 PM
Viktor Mokeev <<a
href="mailto:mokeev@jlab.org"
target="_blank"
moz-do-not-send="true">mokeev@jlab.org</a>>
wrote:<br>
</div>
<blockquote
class="gmail-m_-205057475824645956gmail-m_8193896196696387444gmail-m_-3435344956483943303x_gmail_quote"
style="margin:0px 0px
0px
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solid
rgb(204,204,204);padding-left:1ex">
<div dir="ltr">
<div
id="gmail-m_-205057475824645956gmail-m_8193896196696387444gmail-m_-3435344956483943303x_gmail-m_-59478190252913499divtagdefaultwrapper"
dir="ltr"
style="font-size:12pt;font-family:Calibri,Helvetica,sans-serif">
<div
style="margin-top:0px;margin-bottom:0px">Dear
All,</div>
<div
style="margin-top:0px;margin-bottom:0px"><br>
</div>
<div
style="margin-top:0px;margin-bottom:0px"> 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"><br>
</div>
<div
style="margin-top:0px;margin-bottom:0px">Q^2=2.0
GeV^2 W>3.0 GeV</div>
<div
style="margin-top:0px;margin-bottom:0px">Q^2=5.0
GeV^2 W>2.5 GeV</div>
<div
style="margin-top:0px;margin-bottom:0px"><br>
</div>
<div
style="margin-top:0px;margin-bottom:0px">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"><br>
</div>
<div
style="margin-top:0px;margin-bottom:0px"> Best
Regards,</div>
<div
style="margin-top:0px;margin-bottom:0px">
Victor<br>
</div>
<div
style="margin-top:0px;margin-bottom:0px"><br>
</div>
</div>
<hr
style="display:inline-block;width:98%">
<div
id="gmail-m_-205057475824645956gmail-m_8193896196696387444gmail-m_-3435344956483943303x_gmail-m_-59478190252913499divRplyFwdMsg"
dir="ltr"><font
style="font-size:11pt"
face="Calibri,
 sans-serif"><b>From:</b> Francois-Xavier Girod <<a
href="mailto:fxgirod@jlab.org" target="_blank" moz-do-not-send="true">fxgirod@jlab.org</a>><br>
<b>Sent:</b>
Wednesday,
December 12, 2018
6:09:53 PM<br>
<b>To:</b> Viktor
Mokeev<br>
<b>Cc:</b> clas12
rgk; clas12 first
exp; Rafayel
Paremuzyan<br>
<b>Subject:</b>
Re: [clas12_rgk]
trigger efficiency
vs ECal treshold</font>
<div> </div>
</div>
<div>
<div dir="ltr">Dear
Viktor
<div><br>
</div>
<div>Rafo can
confirmed as he
produced the
plot, my
understanding is
that the
electron
momentum is
measured by the
drift chambers</div>
<div><br>
</div>
<div>Best regards</div>
<div>FX</div>
</div>
<br>
<div
class="gmail-m_-205057475824645956gmail-m_8193896196696387444gmail-m_-3435344956483943303x_gmail-m_-59478190252913499x_gmail_quote">
<div dir="ltr">On
Wed, Dec 12,
2018 at 6:08 PM
Viktor Mokeev
<<a
href="mailto:mokeev@jlab.org"
target="_blank" moz-do-not-send="true">mokeev@jlab.org</a>> wrote:<br>
</div>
<blockquote
class="gmail-m_-205057475824645956gmail-m_8193896196696387444gmail-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">
<div
id="gmail-m_-205057475824645956gmail-m_8193896196696387444gmail-m_-3435344956483943303x_gmail-m_-59478190252913499x_gmail-m_1622187504078827668divtagdefaultwrapper"
dir="ltr"
style="font-size:12pt;font-family:Calibri,Helvetica,sans-serif">
<div
style="margin-top:0px;margin-bottom:0px">Dear
FX,</div>
<div
style="margin-top:0px;margin-bottom:0px"><br>
</div>
<div
style="margin-top:0px;margin-bottom:0px"> 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"><br>
</div>
<div
style="margin-top:0px;margin-bottom:0px">Best
Regards,</div>
<div
style="margin-top:0px;margin-bottom:0px">
Victor<br>
</div>
</div>
<hr
style="display:inline-block;width:98%">
<div
id="gmail-m_-205057475824645956gmail-m_8193896196696387444gmail-m_-3435344956483943303x_gmail-m_-59478190252913499x_gmail-m_1622187504078827668divRplyFwdMsg"
dir="ltr"> <font
style="font-size:11pt" face="Calibri,
 sans-serif"><b>From:</b>
clas12_rgk
<<a
href="mailto:clas12_rgk-bounces@jlab.org"
target="_blank" moz-do-not-send="true">clas12_rgk-bounces@jlab.org</a>>
on behalf of
Francois-Xavier
Girod <<a
href="mailto:fxgirod@jlab.org"
target="_blank" moz-do-not-send="true">fxgirod@jlab.org</a>><br>
<b>Sent:</b>
Wednesday,
December 12,
2018 5:58:01
PM<br>
<b>To:</b>
clas12 rgk; <a
href="mailto:clas12_first_exp@jlab.org" target="_blank"
moz-do-not-send="true">
clas12_first_exp@jlab.org</a><br>
<b>Cc:</b>
Rafayel
Paremuzyan<br>
<b>Subject:</b>
[clas12_rgk]
trigger
efficiency vs
ECal treshold</font>
<div> </div>
</div>
<div>
<div dir="ltr">
<div dir="ltr">
<div dir="ltr">Dear
all
<div><br>
</div>
<div>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><br>
</div>
<div>Please
see the plot</div>
<div><br>
</div>
<div><a
href="https://www.jlab.org/Hall-B/secure/clas12/rec_mon/P_Good_emWithEC_5786.png"
target="_blank" moz-do-not-send="true">https://www.jlab.org/Hall-B/secure/clas12/rec_mon/P_Good_emWithEC_5786.png</a><br>
</div>
<div><br>
</div>
<div>from
Rafo's study
of the trigger
efficiency. He
analyzed run
5786 which was
taken with the
random
trigger. </div>
<div><br>
</div>
<div>- in blue
all "good
electrons"
with
Nphe>2,
E_PCal > 60
MeV, sampling
fraction >
0.2 and
fiducial cuts</div>
<div><br>
</div>
<div>- in
orange, the
electrons
satisfy in
addition
E_ECal >
300 MeV</div>
<div><br>
</div>
<div>- in red,
the events for
which the
orange set was
missing the
electron
trigger bit</div>
<div><br>
</div>
<div>The
trigger
efficiency
is defined as
(orange - red)
/ orange</div>
<div><br>
</div>
<div><a
href="https://www.jlab.org/Hall-B/secure/clas12/rec_mon/Eff_All_Good_em_trg_threshold_5786.png"
target="_blank" moz-do-not-send="true">https://www.jlab.org/Hall-B/secure/clas12/rec_mon/Eff_All_Good_em_trg_threshold_5786.png</a><br>
</div>
<div><br>
</div>
<div>The
trigger
efficiency
below 2 GeV
drops rapidly,
and measuring
a cross
section in
this region is
challenging</div>
<div><br>
</div>
<div>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><br>
</div>
<div>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><br>
</div>
<div>Best
regards</div>
<div>FX</div>
</div>
</div>
</div>
</div>
</div>
</blockquote>
</div>
</div>
</div>
</blockquote>
</div>
</div>
</blockquote>
<br>
</div>
</blockquote>
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