<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'>reaction does not matter, pi0 or anything else<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>"Michael C. Kunkel" <mkunkel@jlab.org><br><b>To: </b>"Eugene Pasyuk" <pasyuk@jlab.org><br><b>Cc: </b>"g12" <g12@jlab.org>, "Johann Goetz" <theodore.goetz@gmail.com><br><b>Sent: </b>Friday, March 28, 2014 4:22:52 PM<br><b>Subject: </b>Re: [G12] GFlux<br><br>
Greetings,<br>
<br>
I am wondering if Johann's trip program takes into account the
tagger hit status to be 7 or 15 as well as does the GFlux calculator
when using the "good" option take this into account?<br>
<br>
Also, Eugene, when you wrote to look at the flux and yield and
normalized yield per E-bin, would the yield of pi0 suffice?<br>
<br>
BR<br>
MK<br>
<br>
<br>
<div class="moz-cite-prefix">On 3/28/14 4:13 PM, Eugene Pasyuk
wrote:<br>
</div>
<blockquote cite="mid:720603509.134399.1396037608071.JavaMail.root@jlab.org">
<style>p { margin: 0; }</style>
<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></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>"Eugene Pasyuk" <a class="moz-txt-link-rfc2396E" href="mailto:pasyuk@jlab.org" target="_blank"><pasyuk@jlab.org></a><br>
<b>To: </b>"Michael C. Kunkel" <a class="moz-txt-link-rfc2396E" href="mailto:mkunkel@jlab.org" target="_blank"><mkunkel@jlab.org></a><br>
<b>Cc: </b>"g12" <a class="moz-txt-link-rfc2396E" href="mailto:g12@jlab.org" target="_blank"><g12@jlab.org></a>, "Johann Goetz"
<a class="moz-txt-link-rfc2396E" href="mailto:theodore.goetz@gmail.com" target="_blank"><theodore.goetz@gmail.com></a><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" <a class="moz-txt-link-rfc2396E" href="mailto:mkunkel@jlab.org" target="_blank"><mkunkel@jlab.org></a><br>
<b>To: </b>"Eugene Pasyuk" <a class="moz-txt-link-rfc2396E" href="mailto:pasyuk@jlab.org" target="_blank"><pasyuk@jlab.org></a>,
"Johann Goetz" <a class="moz-txt-link-rfc2396E" href="mailto:theodore.goetz@gmail.com" target="_blank"><theodore.goetz@gmail.com></a><br>
<b>Cc: </b>"g12" <a class="moz-txt-link-rfc2396E" href="mailto:g12@jlab.org" target="_blank"><g12@jlab.org></a><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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