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<div dir="ltr">Hi All,</div>
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<div dir="ltr">I agree with Eugene that it is 5.7% for the normalization uncertainty. I think it comes in part from the sector-to-sector comparison. </div>
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<div dir="ltr">The typical value of a missing mass resolution depends on the momenta of the particles detected. A typical value is 10-12 MeV. The lowest I have seen is 5 MeV. This is given in one of the pentaquark papers. </div>
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<div dir="ltr">Ken </div>
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On Sep 14, 2020, at 5:21 PM, Volker Crede <<a href="mailto:vcrede@fsu.edu">vcrede@fsu.edu</a>> wrote:<br>
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This is what confuses me … I agree that 5.7% is a more reasonable flux uncertainty but this number seems to be based on the fluctuations of flux normalized omega yields. This is what you call normalization uncertainty. </div>
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And what is called normalization uncertainty in the table seems to be an average deviation of three different cross sections from published g11a results. </div>
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5.7% sounds like a good number for the flux / normalization uncertainty and I can back it up with a reference.</div>
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<b class="">One other question:</b> The referee is asking for a typical value of the CLAS missing-mass resolution referring to our missing pi(0) in the 3pi final state. Would you know where such a value may be quoted? Perhaps in an instrumental paper or a technical
note?</div>
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Thank you for replying so quickly … I have not received the g12 email, perhaps it didn’t go through.</div>
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Cheers,</div>
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<div class="">On Sep 14, 2020, at 5:01 PM, Eugene Pasyuk <<a href="mailto:pasyuk@jlab.org" class="">pasyuk@jlab.org</a>> wrote:</div>
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I think it must be a typo in the Table 27, it should be 5.7 rather than 1.7 for the flux uncertainty.<o:p class=""></o:p></div>
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Normalization uncertainty is coming from run-to-run variation of the normalized yield. Flux uncertainty is global uncertainty of flux. As I recall it came from variation of tagging ratio from different normalization runs. It is a single scaling factor for the
entire tagging range.<o:p class=""></o:p></div>
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<o:p class=""> </o:p></div>
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-Eugene<o:p class=""></o:p></div>
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<b class="">From:</b><span class="Apple-converted-space"> </span>Volker Crede <<a href="mailto:vcrede@fsu.edu" class="">vcrede@fsu.edu</a>><span class="Apple-converted-space"> </span><br class="">
<b class="">Sent:</b><span class="Apple-converted-space"> </span>Monday, September 14, 2020 16:40<br class="">
<b class="">To:</b><span class="Apple-converted-space"> </span>g12 <<a href="mailto:g12@jlab.org" class="">g12@jlab.org</a>><br class="">
<b class="">Cc:</b><span class="Apple-converted-space"> </span>Eugene Pasyuk <<a href="mailto:pasyuk@jlab.org" class="">pasyuk@jlab.org</a>><br class="">
<b class="">Subject:</b><span class="Apple-converted-space"> </span>[EXTERNAL] CLAS-g12 flux / normalization uncertainty<o:p class=""></o:p></div>
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<span style="" class="">Dear Colleagues,<o:p class=""></o:p></span></div>
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<span style="" class="">I am currently working on the referee report for our g12 eta paper and I stumbled over the following issue. On Page 94 of our run-group note (CLAS-NOTE 2017-002), it says that<span class="Apple-converted-space"> </span><i class="">we
should stick to the currently quoted lower bound of the systematic uncertainty for the g12 normalization of 5.7%.</i><o:p class=""></o:p></span></div>
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Later in Table 27, we quote a flux uncertainty of 1.7% and a normalization uncertainty of 1.8%<o:p class=""></o:p></div>
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Can somebody clarify the situation? <o:p class=""></o:p></div>
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1. Where does the flux uncertainty of 1.7% come from?<o:p class=""></o:p></div>
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2. How is the flux uncertainty different from the normalization uncertainty?<o:p class=""></o:p></div>
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3. What have others used or what will others use for these uncertainties in their papers?<o:p class=""></o:p></div>
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<o:p class=""> </o:p></div>
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Best wishes,<o:p class=""></o:p></div>
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<o:p class=""> </o:p></div>
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Volker</div>
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