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On 11/7/11 8:24 AM, Hicks, Kenneth wrote:
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cite="mid:0090C28BF94E1B4499CDBE5B9ABD320643DC13E852@EXMAIL1.ohio.edu"
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<p class="MsoNormal">Looked at another way, the correction
factor changed from 0.584% to 0.509%, a change of
584/509=1.15. Can you <o:p></o:p></p>
<p class="MsoNormal">do better to get a more accurate correction
with less uncertainty?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><b>From:</b> <a class="moz-txt-link-abbreviated" href="mailto:g12-bounces@jlab.org">g12-bounces@jlab.org</a>
[<a class="moz-txt-link-freetext" href="mailto:g12-bounces@jlab.org">mailto:g12-bounces@jlab.org</a>] <b>On Behalf Of </b>Johann
Goetz<br>
<b>Sent:</b> Monday, November 07, 2011 8:20 AM<br>
<b>To:</b> Michael C. Kunkel<br>
<b>Cc:</b> g12<br>
<b>Subject:</b> Re: [G12] Beam Correction II<o:p></o:p></p>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">seems like the error in your result (the
1.00584) is maybe 0.001 or so. Is that reasonable?<o:p></o:p></p>
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<p class="MsoNormal">On Sun, Nov 6, 2011 at 5:47 PM, Michael
C. Kunkel <<a moz-do-not-send="true"
href="mailto:mkunkel@jlab.org">mkunkel@jlab.org</a>>
wrote:<o:p></o:p></p>
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<p class="MsoNormal">On 11/6/11 6:32 AM, Dennis Weygand
wrote: <o:p></o:p></p>
<p class="MsoNormal">What exactly does 'manually' mean?
<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On Nov 4, 2011, at 8:53 PM,
Michael C. Kunkel wrote:<o:p></o:p></p>
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<p class="MsoNormal"><br>
<br>
<o:p></o:p></p>
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<p class="MsoNormal">Greetings G12'rs<br>
<br>
I have realized if I do a manual fit to find the
correction value, I can obtain different
correction values for the beam.<br>
<br>
My previous email had a correction factor of
1.00509. When I do it manually I get a
correction factor of 1.00584.<br>
<br>
I have attached the new plot for run 56515.
There is now only a 2.78 MeV difference in the
mass peak from the expect.<br>
<br>
I know believe this is the correct path to
undertake for the beam corrections.<br>
<br>
BR<br>
MK<br>
<br>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">--<o:p></o:p></p>
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<p class="MsoNormal">Dennis Weygand<o:p></o:p></p>
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<p class="MsoNormal"><a moz-do-not-send="true"
href="mailto:weygand@jlab.org">weygand@jlab.org</a><o:p></o:p></p>
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<p class="MsoNormal"><a moz-do-not-send="true"
href="tel:%28757%29%20269-5926">(757)
269-5926</a> (office)<o:p></o:p></p>
</div>
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<p class="MsoNormal"><a moz-do-not-send="true"
href="tel:%28757%29%20870-4844">(757)
870-4844</a> (cell)<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">It means, instead of having ROOT do a
TF1 fit with initial parameters and allowed variances, I
open the histogram, right click the histogram, open fit
panel, manually set my limits ..etc.....ie manually<br>
<br>
<br>
BR<br>
MK<o:p></o:p></p>
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<p class="MsoNormal"><br>
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<p class="MsoNormal"><br>
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<br>
-- <br>
<a moz-do-not-send="true"
href="http://sites.google.com/site/theodoregoetz/">Johann T.
Goetz, PhD.</a><br>
<a moz-do-not-send="true" href="mailto:jgoetz@ucla.edu">jgoetz@ucla.edu</a><br>
Nefkens Group, UCLA Dept. of Physics & Astronomy<br>
Hall-B, Jefferson Lab, Newport News, VA<br>
Office: 757-269-5465 (CEBAF Center F-335)<br>
Mobile: 757-768-9999<o:p></o:p></p>
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</blockquote>
Hi Ken,<br>
<br>
I'm not sure what you mean by "can I do better". I have recently
done a better job of my fitting procedure, once I learned of a ROOT
fitting caveat, but this still leaves my proton mass low. I will be
presenting it tomorrow, but if you have suggestions before that, I
am always open to that.<br>
<br>
BR<br>
MK<br>
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