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<p>Hello Matt,</p>
<p> The default cuts require:</p>
<p> </p>
<p>a V0 candidate in "TargetConstrainedV0Candidates"</p>
<p>both e+ and e- have a matching ECal cluster</p>
<p>cluster times within 2.5ns of each other</p>
<p> </p>
<p>There's a "tight" cut which would further require one </p>
<p>and only one real vertex in the event.</p>
<p> </p>
<p><span>Norman</span></p>
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<div id="divRplyFwdMsg" dir="ltr"><font color="#000000" face="Calibri, sans-serif" style="font-size: 11pt;"><b>From:</b> Graham, Mathew Thomas<br>
<b>Sent:</b> Monday, September 28, 2015 6:37 AM<br>
<b>To:</b> Graf, Norman A.<br>
<b>Cc:</b> hps-software; hps-analysis@jlab.org<br>
<b>Subject:</b> Re: Event skimming & pass 2.1</font>
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<div>Hi Norman and everyone else, </div>
<div><br>
</div>
<div>I agree that this is a good idea. What are the cuts you used for this skim? </div>
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</div>
<div>I think we decided last week that we’ll need to run a “pass 2.1” because the momentum scale is screwed for vertexed particles now that we are using the full field map. As we discussed, the right thing to do is to swim the tracks (no problem) and their
covariance (not coded yet) back to ~ the target (or a better approximation of where the vertex is) using the full b-field and then run vertexing. The quick thing to do is to just ignore the varying b-field as we were before. </div>
<div><br>
</div>
<div>I propose that we go through run 5772 (the magic run) with this quick fix as well as with the fixes to the DSTs, the DQM plots, and with all skims (including the v0 skim). Then we can re-run the whole pass if we want to when we get the covariance propagation
working. </div>
<div><br>
</div>
<div>Hay or neigh?</div>
<div><br>
</div>
<div>mg</div>
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<blockquote type="cite">
<div>On Sep 27, 2015, at 10:18 PM, Graf, Norman A. <<a href="mailto:ngraf@slac.stanford.edu">ngraf@slac.stanford.edu</a>> wrote:</div>
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Hello All,</div>
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I'd like to propose that we run the V0CandidateFilter<span class="Apple-converted-space"> </span></div>
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the next time we make a pass over the data. Here</div>
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are the statistics running over the pass2 reconstruction</div>
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of the first partition of Run 5772:</div>
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V0CandidateFilter Summary:<br>
events processed = 251823<br>
events passed = 4201<br>
rejection = 0.016682352287122303</div>
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Please let me know if you have any questions or need</div>
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any additional information.</div>
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Thanks,</div>
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Norman</div>
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