[Clas12_verystrange] follow up on yesterday's meeting

[Izzy Illari]

Hello Eugene,

1.) The W and Q^2 distributions are from the hipo file, and not directly 
from the lund file from the MC sims. All plots were generated using hipo 
file.

2.) I will have to check to see what has contaminated the pions and the 
beta vs momentum plots.

3.) As I understand it, the event generator handles decays. From their 
overview they say:

    "...complete events are generated by Monte Carlo methods. The
    complexity is mastered by a subdivision of the full problem into a
    set of simpler separate tasks. All main aspects of the events are
    simulated, such as hard-process selection, initial- and final-state
    radiation, beam remnants, fragmentation, decays, and so on.
    Therefore events should be directly comparable with experimentally
    observable ones. The programs can be used to extract physics from
    comparisons with existing data, or to study physics at future
    experiments."

4.) I will look at the simulated events and see how those compare to the 
reconstruction and/or analysis code.

Thank you for the comments.

All the best,

Izzy

On 10/2/19 4:41 PM, Eugene Pasyuk wrote:
> I am going over your slides. Some of plots make sense, some have problems.
> On slide 3 can you clarify what was exactly simulated. Are these W and Q^2 distributions as simulated or  as reconstructed?
> There are some issues with PID. Pions are contaminated with something. When I look at beta vs momentum on slide 10 I see an enhancement for beta above 0.9. There are also a few weird bands. One is close to beta=1, the other around beta~0.7 and one diverging from the proton band around beta=0.5. The last two pint to the start time being off for some events. The first one I think is contamination from neutrals.
> Do you decay particles in the event generator or you let geant do it? If it is done in the event generator I would step back a little and look at the distributions for simulated events at the come from the event generator before they are processed by gemc. Look at the momentum and angular distributions of electrons, charged pions, protons, photons. This will show what goes where. Then I would compare simulated with reconstructed. This will help understand the issues with reconstruction and/or analysis code. This will also show how the detector acceptance affects what we see.
> Continue with the simulated data because in this case you know exactly what was simulated and compare with what was reconstructed.	Once we get this reasonable then we can switch to the real data.
>   
> -Eugene
>   
>
> -----Original Message-----
> From: Clas12_verystrange <clas12_verystrange-bounces at jlab.org> on behalf of Isabella Illari <izzy at jlab.org>
> Reply-To: clas12 verystrange <clas12_verystrange at jlab.org>
> Date: Wednesday, October 2, 2019 at 14:56
> To: clas12 verystrange <clas12_verystrange at jlab.org>, Igor Strakovsky <igor at gwu.edu>
> Subject: [Clas12_verystrange] follow up on yesterday's meeting
>
>      Dear VS group,
>      
>      I appreciate the comments from yesterday's meeting. As suggested, I have
>      made some slides with explanations of my Event Filters, Schema/Banks
>      that I'm using, and plots. I've also included some code to show how some
>      calculations were made (invariant mass, beta vs p, etc.). I would
>      appreciate any and all feedback. I am holding off on looking at RG-A
>      skim4 files until I can see what everyone has to say about the MC results.
>      
>      I can include the .java file if anyone would like it. I was looking into
>      putting a jupyter notebook up on binder, but saw this required me to
>      have a git repo of the notebook first, and so I just moved my analysis
>      back into Eclipse/java. I will look into put jupyter notebooks up in the
>      future. For anyone wondering, I am using both the jaw-2.0.jar and
>      coat-libs-6c.3.3-SNAPSHOT.jar libraries. As I understand it, these are
>      the most up to date available to us.
>      
>      All the best,
>      
>      Izzy
>      
>      
>
>
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