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<p>Good question Tim. I'll take a look at the Møller MC and see if that sheds any light on this.</p>
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<div id="divRplyFwdMsg" dir="ltr"><font color="#000000" face="Calibri, sans-serif" style="font-size: 11pt;"><b>From:</b> Nelson, Timothy Knight<br>
<b>Sent:</b> Friday, November 17, 2017 2:51 PM<br>
<b>To:</b> Graf, Norman A.<br>
<b>Cc:</b> Rafayel Paremuzyan; hps-analysis@jlab.org; hps-software<br>
<b>Subject:</b> Re: [Hps-analysis] test pass 7d</font>
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<div class="PlainText">Hi Norman,<br>
<br>
Thanks for being really on top of this. <br>
<br>
It’s not a question for today, but on the momenta: do we really even know that we expect the x and y momenta to be centered on zero given ECal acceptance and alignment effects? This has been on my mind a fair bit w.r.t. trying to pin down large scale SVT alignments.
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Cheers,<br>
Tim<br>
<br>
> On Nov 17, 2017, at 2:17 PM, Graf, Norman A. <ngraf@slac.stanford.edu> wrote:<br>
> <br>
> Dear Colleagues,<br>
> I've posted the results of my first, quick analysis of the tpass7d output to the #project-2015pass7 channel on Slack:
<a id="LPlnk631765" href="https://urldefense.proofpoint.com/v2/url?u=https-3A__heavyphotonsearch.slack.com_messages_C5FCT7161_&d=DwMF-g&c=lz9TcOasaINaaC3U7FbMev2lsutwpI4--09aP8Lu18s&r=J4PP6Zl8IyGHpsqWaKegORCYw8hoCHePTw5O95a5lqQ&m=6Ntmewb_7j0ZrpSXbqPEiHhg64RCffQmkzI5yUh8Qho&s=nlKPUM2l4gDK3v_eaxeGQLpc1GBTPB5YLU3ahhWcqTU&e=" previewremoved="true">
https://heavyphotonsearch.slack.com/messages/C5FCT7161/</a> . So far I have only analyzed the Møller skim from run 5772.<br>
> Preliminary conclusions are:<br>
> <br>
> Unconstrained vertex position reconstruction consistent with beamspot centered at (0,0) and a target at z=0.5mm.
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> <br>
> Unconstrained vertex momenta show only very small deviations of beam from z axis.
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> <br>
> Uniformity of mass calculated from the three vertex collections (Unconstrained, BeamspotConstrained and TargetConstrained) confirms the internal consistency of locating the target at z=0.5mm.
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> <br>
> TargetConstrained Møller mass (from a simple Gaussian fit) is <br>
> <br>
> m=0.033276±0.000003 <br>
> <br>
> TargetConstrained Møller mass resolution (from a simple Gaussian fit) is <br>
> <br>
> sigma=1.4633E-3 ± 3.0E-6<br>
> <br>
> So far, so good.<br>
> <br>
> Norman<br>
> <br>
> <br>
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