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Hello Norman,</div>
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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.</div>
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I did require chi2/ndf be less than 1000 for this plot.<br>
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<img style="max-width:100%" class="w-1390 h-1189" size="60688" contenttype="image/png" data-outlook-trace="F:1|T:1" src="cid:b92c5b65-bce6-4a59-a767-f2e2885e47d5"></div>
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Cheers,</div>
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Cameron<br>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Hps-analysis <hps-analysis-bounces@jlab.org> on behalf of Graf, Norman A. <ngraf@slac.stanford.edu><br>
<b>Sent:</b> Tuesday, June 7, 2022 3:59 PM<br>
<b>To:</b> Graham, Mathew Thomas <mgraham@slac.stanford.edu>; hps-analysis@jlab.org <hps-analysis@jlab.org><br>
<b>Subject:</b> [Hps-analysis] [EXTERNAL] Track Chisq Cuts</font>
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<p class="x_MsoNormal"><span style="color:#1F497D">Hello All,</span></p>
<p class="x_MsoNormal"><span style="color:#1F497D"> </span></p>
<p class="x_MsoNormal"><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></p>
<p class="x_MsoNormal"><span style="color:#1F497D"> </span></p>
<p class="x_MsoNormal"><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></p>
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<p class="x_MsoNormal"><span style="color:#1F497D">Thanks,</span></p>
<p class="x_MsoNormal"><span style="color:#1F497D">Norman</span></p>
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