[Halld-offline] vertex bug?

[Puneet Khetarpal]

Hi Matt,

I see the same behavior in HDGeant for DMCThrown as well. The smearing
of the vertex is across all three dimensions. I'm not sure if this is
supposed to be a bug or a feature.

Puneet

http://about.me/puneetk

"No word is true until it is eaten" - 36 Lessons of Vivec, Sermon 27


On Thu, Jun 28, 2012 at 12:38 PM, Matthew Shepherd <mashephe at indiana.edu> wrote:
>
> Hi all,
>
> In working on the photon efficiency studies for the new PID design I noticed a bug (?) with the simulation.  I'm using the particle gun with the SCAP card setting the z vertex to 65.  However, the DMCThrown objects (viewed in hdview2) report a vertex of 80.  The reconstruction, with Paul's change, uses 65 for the vertex.  Does anyone else see this?
>
> BTW (off topic, but related to our discussion yesterday), another good reason for using the center of target for default photon reconstruction is that it removes the dependency of basic photon reconstruction on tracking.  This is probably an order of magnitude or more speedup if one just wants to run photon reconstruction (without track-shower matching, of course).
>
> Matt
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