<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=Windows-1252">
<style type="text/css" style="display:none;"> P {margin-top:0;margin-bottom:0;} </style>
</head>
<body dir="ltr">
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
<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="LPNoLPOWALinkPreview">https://github.com/JeffersonLab/hps-java/blob/master/tracking/src/main/java/org/hps/recon/tracking/kalman/KalmanParams.java</a></div>
<div class="_Entity _EType_OWALinkPreview _EId_OWALinkPreview _EReadonly_1"></div>
<br>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
Probably comes from one of these hardcoded numbers.<br>
</div>
<div id="appendonsend"></div>
<hr style="display:inline-block;width:98%" tabindex="-1">
<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 Bravo, Cameron B. <bravo@slac.stanford.edu><br>
<b>Sent:</b> Tuesday, June 7, 2022 5:10 PM<br>
<b>To:</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> [Hps-analysis] [EXTERNAL] Re: Track Chisq Cuts</font>
<div> </div>
</div>
<style type="text/css" style="display:none">
<!--
p
{margin-top:0;
margin-bottom:0}
-->
</style>
<div dir="ltr">
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
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>
</div>
<div id="x_appendonsend"></div>
<hr tabindex="-1" style="display:inline-block; width:98%">
<div id="x_divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><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>
<div> </div>
</div>
<style>
<!--
@font-face
{font-family:"Cambria Math"}
@font-face
{font-family:Calibri}
p.x_x_MsoNormal, li.x_x_MsoNormal, div.x_x_MsoNormal
{margin:0in;
margin-bottom:.0001pt;
font-size:12.0pt;
font-family:"Times New Roman",serif}
a:link, span.x_x_MsoHyperlink
{color:#0563C1;
text-decoration:underline}
a:visited, span.x_x_MsoHyperlinkFollowed
{color:#954F72;
text-decoration:underline}
p
{margin:0in;
margin-bottom:.0001pt;
font-size:12.0pt;
font-family:"Times New Roman",serif}
p.x_x_msonormal0, li.x_x_msonormal0, div.x_x_msonormal0
{margin:0in;
margin-bottom:.0001pt;
font-size:12.0pt;
font-family:"Times New Roman",serif}
p.x_x_xmsonormal, li.x_x_xmsonormal, div.x_x_xmsonormal
{margin:0in;
margin-bottom:.0001pt;
font-size:11.0pt;
font-family:"Calibri",sans-serif}
p.x_x_xmsonormal0, li.x_x_xmsonormal0, div.x_x_xmsonormal0
{margin:0in;
margin-bottom:.0001pt;
font-size:12.0pt;
font-family:"Times New Roman",serif}
p.x_x_xmsochpdefault, li.x_x_xmsochpdefault, div.x_x_xmsochpdefault
{margin:0in;
margin-bottom:.0001pt;
font-size:10.0pt;
font-family:"Times New Roman",serif}
span.x_x_xmsohyperlink
{color:#0563C1;
text-decoration:underline}
span.x_x_xmsohyperlinkfollowed
{color:#954F72;
text-decoration:underline}
span.x_x_xemailstyle18
{font-family:"Calibri",sans-serif;
color:#1F497D}
span.x_x_EmailStyle25
{font-family:"Calibri",sans-serif;
color:#1F497D}
.x_x_MsoChpDefault
{font-size:10.0pt}
@page WordSection1
{margin:1.0in 1.0in 1.0in 1.0in}
-->
</style>
<div lang="EN-US">
<div class="x_x_WordSection1">
<p class="x_x_MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri",sans-serif; color:#1F497D">Hi Cameron,</span></p>
<p class="x_x_MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri",sans-serif; color:#1F497D"> </span></p>
<p class="x_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_x_MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri",sans-serif; color:#1F497D"> </span></p>
<p class="x_x_MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri",sans-serif; color:#1F497D">Norman</span></p>
<p class="x_x_MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri",sans-serif; color:#1F497D"> </span></p>
<div>
<div style="border:none; border-top:solid #E1E1E1 1.0pt; padding:3.0pt 0in 0in 0in">
<p class="x_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>
</div>
</div>
<p class="x_x_MsoNormal"> </p>
<div>
<p class="x_x_MsoNormal"><span style="font-family:"Calibri",sans-serif; color:black">Hello Norman,</span></p>
</div>
<div>
<p class="x_x_MsoNormal"><span style="font-family:"Calibri",sans-serif; color:black"> </span></p>
</div>
<div>
<p class="x_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>
</div>
<div>
<p class="x_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>
</div>
<div>
<p class="x_x_MsoNormal"><span style="font-family:"Calibri",sans-serif; color:black"><img width="1390" height="1189" id="x_x__x0000_i1025" style="width:14.4791in; height:12.3854in" data-outlook-trace="F:2|T:2" src="cid:image001.png@01D87A90.865A8C30"></span></p>
</div>
<div>
<p class="x_x_MsoNormal"><span style="font-family:"Calibri",sans-serif; color:black"> </span></p>
</div>
<div>
<p class="x_x_MsoNormal"><span style="font-family:"Calibri",sans-serif; color:black">Cheers,</span></p>
</div>
<div>
<p class="x_x_MsoNormal"><span style="font-family:"Calibri",sans-serif; color:black">Cameron</span></p>
</div>
<div class="x_x_MsoNormal" align="center" style="text-align:center">
<hr size="2" width="98%" align="center">
</div>
<div id="x_x_divRplyFwdMsg">
<p class="x_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>
<div>
<p class="x_x_MsoNormal"> </p>
</div>
</div>
<div>
<div>
<p class="x_x_xmsonormal"><span style="color:#1F497D">Hello All,</span></p>
<p class="x_x_xmsonormal"><span style="color:#1F497D"> </span></p>
<p class="x_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_x_xmsonormal"><span style="color:#1F497D"> </span></p>
<p class="x_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>
<p class="x_x_xmsonormal"><span style="color:#1F497D"> </span></p>
<p class="x_x_xmsonormal"><span style="color:#1F497D">Thanks,</span></p>
<p class="x_x_xmsonormal"><span style="color:#1F497D">Norman</span></p>
</div>
</div>
</div>
</div>
</div>
</body>
</html>