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<p>Greetings Andrea,</p>
<p>Tomorrow we will be having an non-regular meeting at out usual
time.<br>
1000 EST, 1600 CET.<br>
We will most likely have a short meeting, so please feel free to
drop in and make it a long meeting.<br>
We, g12, can try to answer your questions then.<br>
</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>
</div>
<blockquote type="cite"
cite="mid:be6224ef-7004-f107-75a5-ddb40e3dafb3@ge.infn.it">
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<font face="Helvetica, Arial, sans-serif">Dear g12 colleagues,<br>
</font>
<div class=""><font face="Helvetica, Arial, sans-serif">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>
</font></div>
<div class=""><font face="Helvetica, Arial, sans-serif">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">I’d like to inform you - just to double
check if there is anyone else looking at this reaction.</font><br>
</div>
<div class=""><font face="Helvetica, Arial, sans-serif">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>
<br>
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>
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>
<br>
<font face="Helvetica, Arial, sans-serif">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="highlight selected">TOF</span>KO(int sector, int scid,
bool all_ko = 0), <font face="Helvetica, Arial, sans-serif">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>
<br>
Thanks,</font><br>
</div>
<br>
<div class=""><font face="Helvetica, Arial, sans-serif">Bests,</font></div>
<font face="Helvetica, Arial, sans-serif">Andrea</font><br
class="">
<br class="">
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</pre>
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