[G12] proton vertex?

[Michael C. Kunkel]

Greetings Carlos,

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.

The only downfall to using MVRT is if a stray particle with DC tracking 
(i.e. "semi-out of time") events.
I usually redo MVRT after I do topology selection.

BR
MK
----------------------------------------
Michael C. Kunkel, PhD
Forschungszentrum Jülich
Nuclear Physics Institute and Juelich Center for Hadron Physics
Experimental Hadron Structure (IKP-1)
www.fz-juelich.de/ikp

On 4/10/15 12:02 PM, Carlos Salgado wrote:
> 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
>
>
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