<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">Dear all,<div class="">thanks for pointing out the bi-weekly meeting, I knew about it and for sure I’ll join the meeting to discuss about these and other issues. I thought that, given the CLAS meeting, the g12 meeting tomorrow was not present - I already have another meeting for tomorrow at that time.</div><div class=""><br class=""></div><div class="">I’ll join in two weeks from now.</div><div class=""><br class=""></div><div class="">Thanks again</div><div class=""><br class=""></div><div class="">Andrea</div><div><br class=""><blockquote type="cite" class=""><div class="">On Nov 13, 2018, at 21:28, Michael C. Kunkel <<a href="mailto:mkunkel@jlab.org" class="">mkunkel@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 text="#000000" bgcolor="#FFFFFF" class=""><p class="">Greetings Andrea,</p><p class="">Tomorrow we will be having an non-regular meeting at out usual
time.<br class="">
1000 EST, 1600 CET.<br class="">
We will most likely have a short meeting, so please feel free to
drop in and make it a long meeting.<br class="">
We, g12, can try to answer your questions then.<br class="">
</p>
<pre class="moz-signature" cols="72">BR
MK
----------------------------------------
Michael C. Kunkel, PhD
Forschungszentrum Jülich
Nuclear Physics Institute and Juelich Center for Hadron Physics
Experimental Hadron Structure (IKP-1)
<a class="moz-txt-link-abbreviated" href="http://www.fz-juelich.de/ikp">www.fz-juelich.de/ikp</a></pre>
<div class="moz-cite-prefix">On 11/13/18 7:15 PM, Andrea Celentano
wrote:<br class="">
</div>
<blockquote type="cite" cite="mid:be6224ef-7004-f107-75a5-ddb40e3dafb3@ge.infn.it" class="">
<meta http-equiv="content-type" content="text/html; charset=utf-8" class="">
<font face="Helvetica, Arial, sans-serif" class="">Dear g12 colleagues,<br class="">
</font>
<div class=""><font face="Helvetica, Arial, sans-serif" class="">I write
you to inform that, after a long time passed after my PhD
thesis defense, that included a (preliminary) analysis of the
gamma p -> p pi0 eta reaction from CLAS-g12 data, I decided
to resume this analysis, starting from scratch and following
closely the g12 procedures highlighted in the official g12
note. In the analysis, I am identifying pi0 and eta via the
gamma-gamma decay.<br class="">
</font></div>
<div class=""><font face="Helvetica, Arial, sans-serif" class="">This will
be a low-priority project for me, but I’d like to come to an
end of it - from what I saw in the thesis, this channel is
very promising. Now, given the huge improvements in g12
analysis that the g12 group did, I think it will be simpler to
come to an end of the analysis.</font><font face="Helvetica,
Arial, sans-serif" class="">I’d like to inform you - just to double
check if there is anyone else looking at this reaction.</font><br class="">
</div>
<div class=""><font face="Helvetica, Arial, sans-serif" class="">I have
just started the analysis, and I am in the phase of selecting
a good sample of exclusive p pi0 eta events. Meanwhile, I also
started MC generation. At some point in the next future, I’d
like to show some progresses in one of the bi-weekly meetings,
in order to get your feedback from this.<br class="">
<br class="">
I already have a simple question regarding MC. I followed
closely the procedures highlighted in the g12 note to generate
a phase-space MC sample (I followed the procedures highlighted
for "proton, pi+, pi-", not those for "electrons and
positrons"). In the real data, if I plot the invariant mass of
a photon pair, I see a pi0 peak at around 135 MeV. However, If
I do the same for MC events, I see a peak at about 116 MeV. I
also plotted the reconstructed photon energy over the
generated photon energy, and I see a peak at around 0.87. It
looks the simulation of EC response in MC is not completely
correct. (I confirm that the peak for generated events is at
135 MeV)<br class="">
Is it because, using the EC, I should follow the procedure
highlighted for "electrons and positrons" (involving run
number 10 and requiring </font>setenv CLAS_CALDB_RUNINDEX
calib_user.RunIndexg12_mk?)<br class="">
<br class="">
<font face="Helvetica, Arial, sans-serif" class="">I also have a question
regarding the TOF knockout procedure. In the note, the
relevant method to use is: </font>clas::g12::pass_g12_<span class="selected highlight">TOF</span>KO(int sector, int scid,
bool all_ko = 0), <font face="Helvetica, Arial, sans-serif" class="">that
requires to know the counter ID. For a charged particle, from
the PART bank I can retrieve the entry in the TBID bank, and
from this to the SCRC bank, that, however, contains
information regarding TOF clusters. From this bank, I don't
see a pointer to the SCR bank - containing individual paddles
data.<br class="">
<br class="">
Thanks,</font><br class="">
</div>
<br class="">
<div class=""><font face="Helvetica, Arial, sans-serif" class="">Bests,</font></div>
<font face="Helvetica, Arial, sans-serif" class="">Andrea</font><br class="">
<br class="">
<br class="">
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<br class="">
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</pre>
</blockquote>
<br class="">
</div>
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