<html><head><style type='text/css'>p { margin: 0; }</style></head><body><div style='font-family: arial,helvetica,sans-serif; font-size: 12pt; color: #000000'>The other thing is to make sure when you select your events and match them to the tagger you use tagger hits with status 7 or 15 only.<br><br><div><span name="x"></span>-Eugene<span name="x"></span><br></div><br><hr id="zwchr"><blockquote style="border-left:2px solid #1010FF;margin-left:5px;padding-left:5px;color:#000;font-weight:normal;font-style:normal;text-decoration:none;font-family:Helvetica,Arial,sans-serif;font-size:12pt;"><b>From: </b>"Eugene Pasyuk" <pasyuk@jlab.org><br><b>To: </b>"Michael C. Kunkel" <mkunkel@jlab.org><br><b>Cc: </b>"g12" <g12@jlab.org>, "Johann Goetz" <theodore.goetz@gmail.com><br><b>Sent: </b>Friday, March 28, 2014 4:04:41 PM<br><b>Subject: </b>Re: [G12] GFlux<br><br><style>p { margin: 0; }</style><div style="font-family: arial,helvetica,sans-serif; font-size: 12pt; color: #000000">The way to figure out is to look at the flux and yield and normalized yield per E-bin, that is the finest binning. If they are consistent, the the problem is in re-binning procedure. If they are not, then we have to look further. Technically speaking there is not unusual that you may have holes on photon spectrum, that would just indicate that some of the counters are dead. <div><br><div><span></span>-Eugene<span></span><br></div><br><hr id="zwchr"><blockquote style="border-left:2px solid #1010FF;margin-left:5px;padding-left:5px;color:#000;font-weight:normal;font-style:normal;text-decoration:none;font-family:Helvetica,Arial,sans-serif;font-size:12pt;"><b>From: </b>"Michael C. Kunkel" <mkunkel@jlab.org><br><b>To: </b>"Eugene Pasyuk" <pasyuk@jlab.org>, "Johann Goetz" <theodore.goetz@gmail.com><br><b>Cc: </b>"g12" <g12@jlab.org><br><b>Sent: </b>Friday, March 28, 2014 3:55:45 PM<br><b>Subject: </b>Re: [G12] GFlux<br><br>
Greetings,<br>
<br>
I am wondering where we are at with the flux issue?<br>
Meaning, what is going on with the flux in the 3.5 GeV region?<br>
<br>
I feel that the flux is in error for a few reasons. <br>
First when I bin flux in 15 MeV, I see 0 flux at 3.515 - 3.53.<br>
Second, when I bin flux in 50 MeV binning I see a drop in flux at
3.5 MeV<br>
Here is the output<br>
//<br>
3.45 3.5 1.06825209003e+12<br>
3.5 3.55 470202243457.0<br>
3.55 3.6 1.69234003548e+12<br>
//<br>
<br>
Third reason is that if you look at my attached pdf, I show the pi0
cross section for various energies, if you were to go to compare the
cross sections around 3.5 GeV to the neighboring Egamma bins, you
will notice a sizable discrepancy. See G12_XSection_ALL.pdf<br>
<br>
Fourth reason, if I were to compare the pi0 cross section in unit of
dsigma/dt and compare it other experiments at 4 and 5 GeV, our cross
section is off by a factor of 2, see t_vs_dsigdt_Compare.pdf<br>
<br>
In order for any g12 papers to be published, we need verification of
cross sections, which as of this moment I do not believe we have.<br>
<br>
BR<br>
MK<br>
<br>
<br>
<br>
<br>
<div class="moz-cite-prefix">On 3/25/14 10:16 PM, Eugene Pasyuk
wrote:<br>
</div>
<blockquote cite="mid:1908667858.873792.1395800206351.JavaMail.root@jlab.org">
<style>p { margin: 0; }</style>
<div style="font-family: arial,helvetica,sans-serif; font-size:
12pt; color: #000000">This is not quite correct, especially when
bins are small and comparable with the width of E-bin.
<div>Just imagine, You energy bin is 3.000-3.015 GeV. E-bin
let's say covers 3.0121-3.0181 GeV. The center of E-bin will
be 3.01505 GeV. When you enter this into the histogram it will
fall to 3.015-3.030 bin then. However, this E-bin should be
split between two adjacent bins in new binning scheme. There
are two possible ways of doing this. Either randomize energy
within the width of the E-bin before you enter it to th
ehistogram, or split it between adjacent bins using weight
which depends on how the bin boundary splits E-bin and have
two entries to the histogram with sum of the weights equal
one. You can imagine, if the bin width is chosen to be less
than the widths of E-bin, then you will get completely empty
bins in resulting histogram.<br>
<br>
<div><span></span>-Eugene<span></span><br>
</div>
<br>
<hr id="zwchr">
<blockquote style="border-left:2px solid
#1010FF;margin-left:5px;padding-left:5px;color:#000;font-weight:normal;font-style:normal;text-decoration:none;font-family:Helvetica,Arial,sans-serif;font-size:12pt;"><b>From:
</b>"Johann Goetz" <a class="moz-txt-link-rfc2396E" href="mailto:theodore.goetz@gmail.com" target="_blank"><theodore.goetz@gmail.com></a><br>
<b>To: </b>"Eugene Pasyuk" <a class="moz-txt-link-rfc2396E" href="mailto:pasyuk@jlab.org" target="_blank"><pasyuk@jlab.org></a><br>
<b>Sent: </b>Tuesday, March 25, 2014 9:12:49 PM<br>
<b>Subject: </b>Re: [G12] GFlux<br>
<br>
<p dir="ltr">I consider the beam energy to be the center of
the energy paddle and fill the histogram at that energy
with the number if counts in the gflux file. Is that
wrong?</p>
<div class="gmail_quote">On Mar 25, 2014 5:59 PM, "Eugene
Pasyuk" <<a href="mailto:pasyuk@jlab.org" target="_blank">pasyuk@jlab.org</a>>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div>
<div style="font-size:12pt;font-family:arial,helvetica,sans-serif">I
see four numbers in each row in this file. I figured
the first one is E-bin number. What are the other
three? I guess the second and the fourth are some
energies. What is the third number which is integer
and varies a lot.<br>
When you say you "histogram" does it mean you take
one fixed number for each E-bin (beam centroid?) and
put it in the histogram, or something else? <br>
<br>
<div><span></span>-Eugene<span></span><br>
</div>
<br>
<hr>
<blockquote style="padding-left:5px;font-size:12pt;font-style:normal;margin-left:5px;font-family:Helvetica,Arial,sans-serif;text-decoration:none;font-weight:normal;border-left:2px
solid #1010ff"><b>From: </b>"Johann Goetz" <<a href="mailto:theodore.goetz@gmail.com" target="_blank">theodore.goetz@gmail.com</a>><br>
<b>To: </b>"g12" <<a href="mailto:g12@jlab.org" target="_blank">g12@jlab.org</a>><br>
<b>Sent: </b>Tuesday, March 25, 2014 5:40:42 PM<br>
<b>Subject: </b>Re: [G12] GFlux<br>
<br>
<div dir="ltr">The output of gflux includes a file
that has the energies of the individual energy
paddles and the counts. These files are then
used to fill a histogram in the g12-gflux script
where the range and bins are specified on the
command line. The energies are slightly
"corrected" to the ones found in the following
file:
<div>
/group/clas/parms/pcor/g12/tagger_energies.dat</div>
<div>But, the correction is very small and
averaged over the whole run period (i.e. not
one a run-by-run basis).</div>
<div>
<div><br>
</div>
</div>
<div>And before you ask, the the summing of the
flux is valid to at least 4 figures -
probably 5. </div>
</div>
<div class="gmail_extra"><br clear="all">
<div>-- <a href="https://sites.google.com/site/theodoregoetz/" target="_blank">Johann</a></div>
<br>
<br>
<div class="gmail_quote">On Tue, Mar 25, 2014 at
4:28 PM, Michael C. Kunkel <span dir="ltr"><<a href="mailto:mkunkel@jlab.org" target="_blank">mkunkel@jlab.org</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px
#ccc solid;padding-left:1ex">
Greetings,<br>
<br>
If the data shows a hole at beam energies,
how does the gflux for this<br>
energy have events?<br>
Below is a table of Gflux for 15MeV binning,
which is to fine for<br>
analysis but great for illustrating this
question.<br>
<br>
Also, notice the 0 entries at 3.5 GeV, and
low events in neighbors.<br>
FORMAT: Emin:Emax:Flux<br>
<br>
<br><br>
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