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Dear Norman,</div>
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Thanks for the plots, these are interesting to me. I have added 3 detectors to the ali21 branch of hps-java.</div>
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I would love to see all these plots for all three of those detectors.</div>
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Thanks,</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-software@SLAC.STANFORD.EDU <hps-software@SLAC.STANFORD.EDU> on behalf of Graf, Norman A. <000001fa7e499a57-dmarc-request@LISTSERV.SLAC.STANFORD.EDU><br>
<b>Sent:</b> Wednesday, March 23, 2022 10:46 PM<br>
<b>To:</b> hps-analysis@jlab.org <hps-analysis@jlab.org>; hps-software <hps-software@slac.stanford.edu><br>
<b>Subject:</b> SVT Vertex Analysis</font>
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<p class="x_MsoNormal">Dear Colleagues,</p>
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<p class="x_MsoNormal">As a follow-up to my analysis of FEE events which I presented at this morning’s analysis/recon meeting (<a href="https://urldefense.proofpoint.com/v2/url?u=https-3A__confluence.slac.stanford.edu_pages_viewpage.action-3FpageId-3D341254335-26preview-3D_341254335_341256282_20220322-5FCalibrationReconstruction-5FGraf-5FHPS-5FDAWG-5FMeeting.pdf&d=DwMF-g&c=CJqEzB1piLOyyvZjb8YUQw&r=JaSEOiNc_6InrJmbYDvKU2tZqhhONpIkbyl_AUnkDSY&m=AJOAkL1DwYW0VFO-kqjN7pqNoOWQvirS8BMqkeaKzELSx53Zh8DIEClzb9y-8ezF&s=8-QvR872yYj9Qj7H5W2hic8uWhsqVFnfZyUF3dDMZAw&e=">https://confluence.slac.stanford.edu/pages/viewpage.action?pageId=341254335&preview=/341254335/341256282/20220322_CalibrationReconstruction_Graf_HPS_DAWG_Meeting.pdf</a>)
I have reconstructed the data that was taken using the SVT positioning wires as targets. The positions of these wires are known to much higher precision than that of the tungsten target, and using both positron and electron tracks in the data should reduce
the systematics and improve the precision of the vertex measurement. I have posted a new set of slides summarizing the current state of this analysis to
<a href="https://urldefense.proofpoint.com/v2/url?u=https-3A__confluence.slac.stanford.edu_pages_viewpage.action-3FpageId-3D341254335-26preview-3D_341254335_341257564_20220323-5FSVTWireTargetVertexAnalysis-5FGraf-5FHPS-5FWeekly-5FMeeting.pdf&d=DwMF-g&c=CJqEzB1piLOyyvZjb8YUQw&r=JaSEOiNc_6InrJmbYDvKU2tZqhhONpIkbyl_AUnkDSY&m=AJOAkL1DwYW0VFO-kqjN7pqNoOWQvirS8BMqkeaKzELSx53Zh8DIEClzb9y-8ezF&s=j7n0VOOdVG0BHSGSOFaCaU9UO_Frwm3vtXt5UFhsJqw&e=">
https://confluence.slac.stanford.edu/pages/viewpage.action?pageId=341254335&preview=/341254335/341257564/20220323_SVTWireTargetVertexAnalysis_Graf_HPS_Weekly_Meeting.pdf</a> . There are a number of interesting features in the data but the most interesting feature
for me is that the latest SVT geometry encapsulated in the HPS_Run2021Pass2FEE detector reconstructs the wire positions almost a centimeter downstream of their measured locations. I invite you to look at the slides and let me know if you have any questions
or suggestions on how to improve this analysis.</p>
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<p class="x_MsoNormal">Sincerely,</p>
<p class="x_MsoNormal">Norman</p>
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