[Eg6_analysis] EG6 tracking

[Stepan Stepanyan]

Dear all,

I did some comparison of eg6 and e1-dvcs1 (old) trackings.
Here is some simple pictures (attached) that clearly show
there is a problem with eg6 tracking, vertex definition.

As you can see, dvcs lines for vx vs. vy distributions for each sector,
cross at 0, as it should be (we assumed beam goes at (0,0) point in
(X,Y)). While for eg6 these lines are not crossing. Meaning, that for
different sectors tracking takes different "beam plane" to cross the
track and define the vertex.
Even if we have beam not going through (0,0) point in transverse
plane (which is the case most of the time), correct tracking should
have these lines crossed at the same point.

Just some thing to think about , while you are enjoying you
4th of July weekend.

Regards, Stepan

-------------- next part --------------
A non-text attachment was scrubbed...
Name: vy_vx_dvcs1.jpg
Type: image/jpeg
Size: 80245 bytes
Desc: not available
Url : https://mailman.jlab.org/pipermail/eg6_analysis/attachments/20110701/48e87ca8/attachment-0002.jpg 
-------------- next part --------------
A non-text attachment was scrubbed...
Name: vy_vx_eg6.jpg
Type: image/jpeg
Size: 82601 bytes
Desc: not available
Url : https://mailman.jlab.org/pipermail/eg6_analysis/attachments/20110701/48e87ca8/attachment-0003.jpg