<html xmlns="http://www.w3.org/TR/REC-html40" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:v="urn:schemas-microsoft-com:vml"><head></head><body vlink="purple" link="blue" lang="EN-US"><div class="WordSection1"><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><div><p class="MsoNormal"><b>From:</b> g12-bounces@jlab.org [mailto:g12-bounces@jlab.org] <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><div><p class="MsoNormal">On Sun, Nov 6, 2011 at 5:47 PM, Michael C. Kunkel <<a href="mailto:mkunkel@jlab.org">mkunkel@jlab.org</a>> wrote:<o:p></o:p></p><div><div><div><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><div><p class="MsoNormal"><o:p> </o:p></p><div><div><p class="MsoNormal">On Nov 4, 2011, at 8:53 PM, Michael C. Kunkel wrote:<o:p></o:p></p></div><p class="MsoNormal"><br><br><o:p></o:p></p><div><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><corrected_plotII.jpg>_______________________________________________<br>G12 mailing list<br><a href="mailto:G12@jlab.org">G12@jlab.org</a><br><a href="https://mailman.jlab.org/mailman/listinfo/g12">https://mailman.jlab.org/mailman/listinfo/g12</a><o:p></o:p></p></div></div><p class="MsoNormal"><o:p> </o:p></p><div><div><div><p class="MsoNormal">--<o:p></o:p></p></div><div><p class="MsoNormal">Dennis Weygand<o:p></o:p></p></div><div><p class="MsoNormal"><a href="mailto:weygand@jlab.org">weygand@jlab.org</a><o:p></o:p></p></div><div><p class="MsoNormal"><a href="tel:%28757%29%20269-5926">(757) 269-5926</a> (office)<o:p></o:p></p></div><div><p class="MsoNormal"><a href="tel:%28757%29%20870-4844">(757) 870-4844</a> (cell)<o:p></o:p></p></div><div><p class="MsoNormal"><o:p> </o:p></p></div><p class="MsoNormal"><o:p> </o:p></p></div><p class="MsoNormal"><o:p> </o:p></p></div><p class="MsoNormal"><o:p> </o:p></p></div></div></div><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></div><p class="MsoNormal"><br>_______________________________________________<br>G12 mailing list<br><a href="mailto:G12@jlab.org">G12@jlab.org</a><br><a href="https://mailman.jlab.org/mailman/listinfo/g12">https://mailman.jlab.org/mailman/listinfo/g12</a><o:p></o:p></p></div><p class="MsoNormal"><br><br clear="all"><br>-- <br><a href="http://sites.google.com/site/theodoregoetz/">Johann T. Goetz, PhD.</a><br><a 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></div></body></html>