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It is what I said. If I require exactly 14 hits I do see a ~cut at 25, but also do see a few events sprinkled above 25 like you do.<br>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Graf, Norman A. <ngraf@slac.stanford.edu><br>
<b>Sent:</b> Tuesday, June 7, 2022 5:03 PM<br>
<b>To:</b> Bravo, Cameron B. <bravo@slac.stanford.edu>; Graham, Mathew Thomas <mgraham@slac.stanford.edu>; hps-analysis@jlab.org <hps-analysis@jlab.org><br>
<b>Subject:</b> RE: Track Chisq Cuts</font>
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<p class="x_MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri",sans-serif; color:#1F497D">Hi Cameron,</span></p>
<p class="x_MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri",sans-serif; color:#1F497D"> </span></p>
<p class="x_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?</span></p>
<p class="x_MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri",sans-serif; color:#1F497D"> </span></p>
<p class="x_MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri",sans-serif; color:#1F497D">Norman</span></p>
<p class="x_MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri",sans-serif; color:#1F497D"> </span></p>
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<p class="x_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</span></p>
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<p class="x_MsoNormal"><span style="font-family:"Calibri",sans-serif; color:black">Hello Norman,</span></p>
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<p class="x_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.</span></p>
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<p class="x_MsoNormal"><span style="font-family:"Calibri",sans-serif; color:black">I did require chi2/ndf be less than 1000 for this plot.</span></p>
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<p class="x_MsoNormal"><span style="font-family:"Calibri",sans-serif; color:black"><img width="1390" height="1189" id="x__x0000_i1025" style="width:14.4791in; height:12.3854in" data-outlook-trace="F:1|T:1" src="cid:image001.png@01D87A90.865A8C30"></span></p>
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<p class="x_MsoNormal"><span style="font-family:"Calibri",sans-serif; color:black">Cheers,</span></p>
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<p class="x_MsoNormal"><span style="font-family:"Calibri",sans-serif; color:black">Cameron</span></p>
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<p class="x_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> </p>
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<p class="x_xmsonormal"><span style="color:#1F497D">Hello All,</span></p>
<p class="x_xmsonormal"><span style="color:#1F497D"> </span></p>
<p class="x_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></p>
<p class="x_xmsonormal"><span style="color:#1F497D"> </span></p>
<p class="x_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></p>
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<p class="x_xmsonormal"><span style="color:#1F497D">Thanks,</span></p>
<p class="x_xmsonormal"><span style="color:#1F497D">Norman</span></p>
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