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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Hi Cameron,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Thanks for that feedback. Are these top tracks with 14 hits?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Norman<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Bravo, Cameron B. <bravo@slac.stanford.edu>
<br>
<b>Sent:</b> Tuesday, June 7, 2022 4:39 PM<br>
<b>To:</b> Graf, Norman A. <ngraf@slac.stanford.edu>; Graham, Mathew Thomas <mgraham@slac.stanford.edu>; hps-analysis@jlab.org<br>
<b>Subject:</b> Re: Track Chisq Cuts<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif;color:black">Hello Norman,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif;color:black">I see plenty of KF tracks with chi2/ndf over 25 in run 14166. This is all KF tracks in the top in partition 37 of that run using a detector I made last week.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif;color:black">I did require chi2/ndf be less than 1000 for this plot.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif;color:black"><img width="1390" height="1189" style="width:14.4791in;height:12.3854in" id="_x0000_i1025" src="cid:image001.png@01D87A90.865A8C30"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif;color:black">Cheers,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif;color:black">Cameron<o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black"> Hps-analysis <<a href="mailto:hps-analysis-bounces@jlab.org">hps-analysis-bounces@jlab.org</a>>
on behalf of Graf, Norman A. <<a href="mailto:ngraf@slac.stanford.edu">ngraf@slac.stanford.edu</a>><br>
<b>Sent:</b> Tuesday, June 7, 2022 3:59 PM<br>
<b>To:</b> Graham, Mathew Thomas <<a href="mailto:mgraham@slac.stanford.edu">mgraham@slac.stanford.edu</a>>;
<a href="mailto:hps-analysis@jlab.org">hps-analysis@jlab.org</a> <<a href="mailto:hps-analysis@jlab.org">hps-analysis@jlab.org</a>><br>
<b>Subject:</b> [Hps-analysis] [EXTERNAL] Track Chisq Cuts</span> <o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="xmsonormal"><span style="color:#1F497D">Hello All,</span><o:p></o:p></p>
<p class="xmsonormal"><span style="color:#1F497D"> </span><o:p></o:p></p>
<p class="xmsonormal"><span style="color:#1F497D">Here is a followup to my presentation at today’s meeting with somewhat higher statistics. Recall that track1 is associated with a calorimeter cluster, whereas track2 has no such requirement. To get around the
bimodal momentum distribution in top tracks I require 14 hits on tracks on the top and 13 hits on tracks on the bottom (due to the dead sensor). I plot here the chisq/ndf for Møller candidates with such tight restrictions on the number of hits. Not only is
the track fit much worse for top tracks, there is a hard cutoff at 25, which is clearly cutting into the number of tracks on the top. I have not explicitly applied this cut in my analysis.</span><o:p></o:p></p>
<p class="xmsonormal"><span style="color:#1F497D"> </span><o:p></o:p></p>
<p class="xmsonormal"><span style="color:#1F497D">Looking at a more general sample of tracks, I notice a similar cutoff at higher values of chisq, although it varies by number of hits on the track. Before I dive into the code does this look familiar to anyone?
Is there an explicit maximum chisq cut being applied in the current track reconstruction?</span><o:p></o:p></p>
<p class="xmsonormal"><span style="color:#1F497D"> </span><o:p></o:p></p>
<p class="xmsonormal"><span style="color:#1F497D">Thanks,</span><o:p></o:p></p>
<p class="xmsonormal"><span style="color:#1F497D">Norman</span><o:p></o:p></p>
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