[Halld-offline] vertex bug?

[David Lawrence]

Hi All,

   It looks like this was put in along with some other changes to the 
vertex handling in March of this year (revision 8887). It evenly 
distributes the vertex z-position for the particle gun over a 30cm span 
centered on the SCAP z position. We could revert this or add another 
control card to turn on/off the distributed target behavior. Any 
preferences?

Regards,
-David

On 6/28/12 12:42 PM, Puneet Khetarpal wrote:
> 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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