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I see, this is nice. Looks like we do currently use mostly defaults.<br>
<a href="https://urldefense.proofpoint.com/v2/url?u=https-3A__github.com_JeffersonLab_hps-2Djava_blob_master_steering-2Dfiles_src_main_resources_org_hps_steering_recon_PhysicsRun2021-5Fpass0-5Frecon-5Fevio.lcsim-23L269&d=DwMF-g&c=CJqEzB1piLOyyvZjb8YUQw&r=JaSEOiNc_6InrJmbYDvKU2tZqhhONpIkbyl_AUnkDSY&m=arZMnawUI9fy16o-1QnkHcWWuh8PV_rZ6eHl2eeWdA4Of9N6db9hsLNs712tb3FW&s=HzyAyfJRg1U2pxaBkWPYhsBvE2RX7XoaWaic-lNdx-w&e=" id="LPNoLPOWALinkPreview">https://github.com/JeffersonLab/hps-java/blob/master/steering-files/src/main/resources/org/hps/steering/recon/PhysicsRun2021_pass0_recon_evio.lcsim#L269</a><br>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Robert Johnson <rjohnson@ucsc.edu><br>
<b>Sent:</b> Tuesday, June 7, 2022 5:42 PM<br>
<b>To:</b> Bravo, Cameron B. <bravo@slac.stanford.edu><br>
<b>Cc:</b> Graf, Norman A. <ngraf@slac.stanford.edu>; Graham, Mathew Thomas <mgraham@slac.stanford.edu>; hps-analysis@jlab.org <hps-analysis@jlab.org><br>
<b>Subject:</b> Re: [Hps-analysis] [EXTERNAL] Re: Track Chisq Cuts</font>
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<div dir="ltr">Only the default values are hardcoded. They all can be, and may be, modified by the steering file.
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<div>Robert P. Johnson</div>
<div>Professor</div>
<div>Physics Department</div>
<div>Santa Cruz Institute for Particle Physics</div>
<div>University of California at Santa Cruz</div>
<div>Santa Cruz, CA 95064</div>
<div>831-459-2125</div>
<div><a href="mailto:rjohnson@ucsc.edu" target="_blank">rjohnson@ucsc.edu</a></div>
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<div dir="ltr" class="x_gmail_attr">On Tue, Jun 7, 2022 at 5:16 PM Bravo, Cameron B. <<a href="mailto:bravo@slac.stanford.edu">bravo@slac.stanford.edu</a>> wrote:<br>
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<a href="https://urldefense.proofpoint.com/v2/url?u=https-3A__github.com_JeffersonLab_hps-2Djava_blob_master_tracking_src_main_java_org_hps_recon_tracking_kalman_KalmanParams.java&d=DwMF-g&c=CJqEzB1piLOyyvZjb8YUQw&r=JaSEOiNc_6InrJmbYDvKU2tZqhhONpIkbyl_AUnkDSY&m=_dIpefaElthIovRGpd51k2QSLzXqneNsG1eYNUkorr_FLz5DlskHP2uNzXUvQw3q&s=lW22qIYz7qremO_4SZDK0LwuvDyYZ55EzFOpyQI2pz0&e=" id="x_gmail-m_-3211086049208036929LPNoLPOWALinkPreview" target="_blank">https://github.com/JeffersonLab/hps-java/blob/master/tracking/src/main/java/org/hps/recon/tracking/kalman/KalmanParams.java</a></div>
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Probably comes from one of these hardcoded numbers.<br>
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<div id="x_gmail-m_-3211086049208036929divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> Hps-analysis <<a href="mailto:hps-analysis-bounces@jlab.org" target="_blank">hps-analysis-bounces@jlab.org</a>>
on behalf of Bravo, Cameron B. <<a href="mailto:bravo@slac.stanford.edu" target="_blank">bravo@slac.stanford.edu</a>><br>
<b>Sent:</b> Tuesday, June 7, 2022 5:10 PM<br>
<b>To:</b> Graf, Norman A. <<a href="mailto:ngraf@slac.stanford.edu" target="_blank">ngraf@slac.stanford.edu</a>>; Graham, Mathew Thomas <<a href="mailto:mgraham@slac.stanford.edu" target="_blank">mgraham@slac.stanford.edu</a>>;
<a href="mailto:hps-analysis@jlab.org" target="_blank">hps-analysis@jlab.org</a> <<a href="mailto:hps-analysis@jlab.org" target="_blank">hps-analysis@jlab.org</a>><br>
<b>Subject:</b> [Hps-analysis] [EXTERNAL] Re: Track Chisq Cuts</font>
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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="x_gmail-m_-3211086049208036929x_divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> Graf, Norman A. <<a href="mailto:ngraf@slac.stanford.edu" target="_blank">ngraf@slac.stanford.edu</a>><br>
<b>Sent:</b> Tuesday, June 7, 2022 5:03 PM<br>
<b>To:</b> Bravo, Cameron B. <<a href="mailto:bravo@slac.stanford.edu" target="_blank">bravo@slac.stanford.edu</a>>; Graham, Mathew Thomas <<a href="mailto:mgraham@slac.stanford.edu" target="_blank">mgraham@slac.stanford.edu</a>>;
<a href="mailto:hps-analysis@jlab.org" target="_blank">hps-analysis@jlab.org</a> <<a href="mailto:hps-analysis@jlab.org" target="_blank">hps-analysis@jlab.org</a>><br>
<b>Subject:</b> RE: Track Chisq Cuts</font>
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<p><span style="font-size:11pt; font-family:Calibri,sans-serif; color:rgb(31,73,125)">Hi Cameron,</span></p>
<p><span style="font-size:11pt; font-family:Calibri,sans-serif; color:rgb(31,73,125)"> </span></p>
<p><span style="font-size:11pt; font-family:Calibri,sans-serif; color:rgb(31,73,125)">Thanks for that feedback. Are these top tracks with 14 hits?</span></p>
<p><span style="font-size:11pt; font-family:Calibri,sans-serif; color:rgb(31,73,125)"> </span></p>
<p><span style="font-size:11pt; font-family:Calibri,sans-serif; color:rgb(31,73,125)">Norman</span></p>
<p><span style="font-size:11pt; font-family:Calibri,sans-serif; color:rgb(31,73,125)"> </span></p>
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<p><b><span style="font-size:11pt; font-family:Calibri,sans-serif">From:</span></b><span style="font-size:11pt; font-family:Calibri,sans-serif"> Bravo, Cameron B. <<a href="mailto:bravo@slac.stanford.edu" target="_blank">bravo@slac.stanford.edu</a>>
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<b>Sent:</b> Tuesday, June 7, 2022 4:39 PM<br>
<b>To:</b> Graf, Norman A. <<a href="mailto:ngraf@slac.stanford.edu" target="_blank">ngraf@slac.stanford.edu</a>>; Graham, Mathew Thomas <<a href="mailto:mgraham@slac.stanford.edu" target="_blank">mgraham@slac.stanford.edu</a>>;
<a href="mailto:hps-analysis@jlab.org" target="_blank">hps-analysis@jlab.org</a><br>
<b>Subject:</b> Re: Track Chisq Cuts</span></p>
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<p><span style="font-family:Calibri,sans-serif; color:black">Hello Norman,</span></p>
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<p><span style="font-family:Calibri,sans-serif; color:black"> </span></p>
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<p><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><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><span style="font-family:Calibri,sans-serif; color:black">Cheers,</span></p>
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<p><span style="font-family:Calibri,sans-serif; color:black">Cameron</span></p>
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<p><b><span style="font-size:11pt; font-family:Calibri,sans-serif; color:black">From:</span></b><span style="font-size:11pt; font-family:Calibri,sans-serif; color:black"> Hps-analysis <<a href="mailto:hps-analysis-bounces@jlab.org" target="_blank">hps-analysis-bounces@jlab.org</a>>
on behalf of Graf, Norman A. <<a href="mailto:ngraf@slac.stanford.edu" target="_blank">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" target="_blank">mgraham@slac.stanford.edu</a>>;
<a href="mailto:hps-analysis@jlab.org" target="_blank">hps-analysis@jlab.org</a> <<a href="mailto:hps-analysis@jlab.org" target="_blank">hps-analysis@jlab.org</a>><br>
<b>Subject:</b> [Hps-analysis] [EXTERNAL] Track Chisq Cuts</span> </p>
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<p><span style="color:rgb(31,73,125)">Hello All,</span></p>
<p><span style="color:rgb(31,73,125)"> </span></p>
<p><span style="color:rgb(31,73,125)">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><span style="color:rgb(31,73,125)"> </span></p>
<p><span style="color:rgb(31,73,125)">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>
<p><span style="color:rgb(31,73,125)"> </span></p>
<p><span style="color:rgb(31,73,125)">Thanks,</span></p>
<p><span style="color:rgb(31,73,125)">Norman</span></p>
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