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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Hi Cameron,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Thanks for taking a look at this presentation. I’ll take a look at the new detectors and post my findings.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">It would be very useful if you would run the alignment over runs 753 and 754 using the wire positions as beamspot constraints, viz.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">01753 SVT beamspot at (0.0, 0.2, 34.544)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">01754 SVT beamspot at (0.0, 0.2, 20.600)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">You can either accept all good electron and positron tracks and fit without a momentum constraint or you can align using only FEEs and impose the momentum constraint,
but take note of the structure in the top electron momentum spectrum shown on slide 3. I believe that originates from FEEs on the positron side, so a first pass alignment without a momentum constraint might be needed there.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Thanks,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Norman<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
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<p class="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"> hps-software@SLAC.STANFORD.EDU <hps-software@SLAC.STANFORD.EDU>
<b>On Behalf Of </b>Bravo, Cameron B.<br>
<b>Sent:</b> Wednesday, March 23, 2022 11:53 PM<br>
<b>To:</b> Graf, Norman A. <000001fa7e499a57-dmarc-request@LISTSERV.SLAC.STANFORD.EDU>; hps-analysis@jlab.org; hps-software <hps-software@slac.stanford.edu><br>
<b>Subject:</b> Re: SVT Vertex Analysis<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif;color:black">Dear Norman,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif;color:black">Thanks for the plots, these are interesting to me. I have added 3 detectors to the ali21 branch of hps-java.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif;color:black">I would love to see all these plots for all three of those detectors.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif;color:black">Thanks,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif;color:black">Cameron<o:p></o:p></span></p>
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<p class="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">
</span><a href="mailto:hps-software@SLAC.STANFORD.EDU"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">hps-software@SLAC.STANFORD.EDU</span></a><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black"> <</span><a href="mailto:hps-software@SLAC.STANFORD.EDU"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">hps-software@SLAC.STANFORD.EDU</span></a><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black">>
on behalf of Graf, Norman A. <</span><a href="mailto:000001fa7e499a57-dmarc-request@LISTSERV.SLAC.STANFORD.EDU"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">000001fa7e499a57-dmarc-request@LISTSERV.SLAC.STANFORD.EDU</span></a><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black">><br>
<b>Sent:</b> Wednesday, March 23, 2022 10:46 PM<br>
<b>To:</b> </span><a href="mailto:hps-analysis@jlab.org"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">hps-analysis@jlab.org</span></a><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black"> <</span><a href="mailto:hps-analysis@jlab.org"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">hps-analysis@jlab.org</span></a><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black">>;
hps-software <</span><a href="mailto:hps-software@slac.stanford.edu"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">hps-software@slac.stanford.edu</span></a><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black">><br>
<b>Subject:</b> SVT Vertex Analysis</span> <o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="xmsonormal">Dear Colleagues,<o:p></o:p></p>
<p class="xmsonormal"> <o:p></o:p></p>
<p class="xmsonormal">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=DwMFAg&c=CJqEzB1piLOyyvZjb8YUQw&r=JaSEOiNc_6InrJmbYDvKU2tZqhhONpIkbyl_AUnkDSY&m=c4-V-E6_ZJwS6-mdTFIoDjRZaY-OIf5SIo8Qv2k-m0jzgcm_DFtS7oGx89oI8adH&s=G06D9-XVeEVWu9UXGwK9jS4ZwOR4Pesuk7PbjAI2vUQ&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=DwMFAg&c=CJqEzB1piLOyyvZjb8YUQw&r=JaSEOiNc_6InrJmbYDvKU2tZqhhONpIkbyl_AUnkDSY&m=c4-V-E6_ZJwS6-mdTFIoDjRZaY-OIf5SIo8Qv2k-m0jzgcm_DFtS7oGx89oI8adH&s=JwR754l6cp9LKSoBWTPj-oF9VzW_y-m4_8TBddp5pTE&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.<o:p></o:p></p>
<p class="xmsonormal"> <o:p></o:p></p>
<p class="xmsonormal">Sincerely,<o:p></o:p></p>
<p class="xmsonormal">Norman<o:p></o:p></p>
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