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

[Stepan Stepanyan]

Hello Nathan,

Thanks for the report. The way you have things fixed are fine.
In track finding I would even go with the first option. For hit
separation even 6mm will be reasonable and I agree all bad
tracks can be dropped.

Looking on eg6, eg1dvcs, and eg2 distributions clearly low
momentum tracks are the problem. After cutting those I can
see for example \rho peak in pi+pi- mass distribution.
Use of fiducial cuts will be important for the final analysis.

Regards, Stepan

On 9/17/12 10:09 PM, Nathan Baltzell wrote:
> 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
>> _______________________________________________
>> Eg6_analysis mailing list
>> Eg6_analysis at jlab.org
>> https://mailman.jlab.org/mailman/listinfo/eg6_analysis
> _______________________________________________
> Eg6_analysis mailing list
> Eg6_analysis at jlab.org
> https://mailman.jlab.org/mailman/listinfo/eg6_analysis