[Eg6_analysis] No meeting this week, unless some one takes over

[Nathan Baltzell]

Hi EG6,

I went throught the RTPC reconstruction code in more detail over
the last week.  Few more bugs.  Ready to recook and recalibrate.
Here are some changes I'd like your opinions on:

http://clasweb.jlab.org/rungroups/lowq/wiki/index.php/GEM_Mods_for_Review



We also made a eg1-dvcs comparison, but just with some plots I found in
presentations.  Looks similar to eg6.  Notably, at low momentum there is
not clear differentation between sectors for reconstructed tracks in CLAS
due to solenoid field.  Plotting p vs phi you can clearly see the cross-
sector smearing at low momentum.


And I translated IC fiducial cut from eg1-dvs for extended target.
It's in c.  I don't know if solenoid polarity is correct for eg6.

http://clasweb.jlab.org/rungroups/lowq/wiki/index.php/IC_Fiducial_Cut


Thanks,
Nathan






On Mon, 17 Sep 2012 15:13:01 -0500, Stepan Stepanyan <stepanya at jlab.org>  
wrote:

> Dear all,
>
> I will be on vacation this Thursday and will not be able to call the
> meeting.
> Let me know if some one wants to run the meeting, I can send required
> information for conference calling (chairperson should be at JLAB).
> Otherwise
> we will cancel this weeks meeting.
>
> If people have any news on software developments or data analysis please
> send round in the emails. I did further studies with epi+pi-, this time I
> looked eg1dvcs data set that is very close to our conditions, meaning
> solenoid field and nuclear target, and it turns out the invariant mass
> distribution
> and other distributions that I had last time from eg6  are very similar.
> I posted new plots on my website at /userweb.jlab.org/~stepanya/eg6/
> new files mark as eg1dvcs.
> So the results of these studies are (1) our tracking software works the
> same
> way as the tracking from other groups in similar conditions, (2) we
> should pay
> very close attention on fiducial cuts for events in CLAS. In particular
> we should
> select charged particles in CLAS that pass through RTPC low density
> front panel
> and not thick parts of sports for GEMs or through IC enclosure and lead
> shield. This requirement will impose Z-vertex dependent polar angle cut.  
> In
> contrary to eg1dvcs or eg2 or e1dvcs, our target is very long and
> single, simple
> fiducial cut will not work. I will work on this next, but the next
> (perhaps final)
> pass1 cooking should not be delayed for this.
>
> Regards, Stepan
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