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Greetings Carlos,<br>
<br>
Yes this has been seen and discussed previously in G12. What this is
is the intersection of the x-y plane with a projection on the z.
This value should be used in a DOCA analysis, but if you want to
have the proper vertex, use MVRT which is the projection of rays and
points within all particles in the event.<br>
<br>
The only downfall to using MVRT is if a stray particle with DC
tracking (i.e. "semi-out of time") events.<br>
I usually redo MVRT after I do topology selection.<br>
<br>
<pre class="moz-signature" cols="72">BR
MK
----------------------------------------
Michael C. Kunkel, PhD
Forschungszentrum Jülich
Nuclear Physics Institute and Juelich Center for Hadron Physics
Experimental Hadron Structure (IKP-1)
<a class="moz-txt-link-abbreviated" href="http://www.fz-juelich.de/ikp">www.fz-juelich.de/ikp</a></pre>
<div class="moz-cite-prefix">On 4/10/15 12:02 PM, Carlos Salgado
wrote:<br>
</div>
<blockquote
cite="mid:621557255.4092569.1428681739626.JavaMail.zimbra@jlab.org"
type="cite">
<pre wrap="">Hello g12s
A question: Attached is (what is called in his tree): the proton vertex-x versus vertex-y from Andres' Ppippim skim.
Have you ever seen a similar distribution? What is going on? we get a beautiful picture of CLAS sectors!
-Carlos</pre>
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</pre>
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