[Clas12_dileptons] [EXTERNAL] Re: Pass 2 Improvements

Rafayel Paremuzyan rafopar at jlab.org
Tue Jul 4 12:55:50 EDT 2023

Hi Bryan,

sorry for not sending cancellation e-mail.

Yes no meeting today.

From: Clas12_dileptons <clas12_dileptons-bounces at jlab.org> on behalf of Bryan McKinnon via Clas12_dileptons <clas12_dileptons at jlab.org>
Sent: Tuesday, July 4, 2023 8:21 AM
To: Clas12_dileptons at jlab.org <clas12_dileptons at jlab.org>
Subject: Re: [Clas12_dileptons] [EXTERNAL] Re: Pass 2 Improvements

I assume there is no meeting today due to it being 4th July…?

On 3 Jul 2023, at 14:21, Richard Tyson (PGR) via Clas12_dileptons <clas12_dileptons at jlab.org> wrote:

Hi Pierre,

Thanks for your comments.

I haven't re-trained the AI PID on pass 2 data although I agree with you that this needs to be done. From the plots comparing quantities like sampling fraction or energy deposition it seems like these distributions are roughly consistent between pass 1 and pass 2 so as a first look I thought it would be ok to re-use the AI PID from pass 1.

I'm not sure why the resolution is larger in pass 2. It might be the case that the tracks we're recovering compared to pass 1 are tracks that are harder to reconstruct leading to a larger resolution overall. I don't know if anyone has any other idea as to why that might be? This will need to be investigated in more detail in any case, will be interesting to see if this is also the case in other channels...

From: Pierre Chatagnon <pierrec at jlab.org<mailto:pierrec at jlab.org>>
Sent: 03 July 2023 13:48
To: Richard Tyson (PGR) <r.tyson.1 at research.gla.ac.uk<mailto:r.tyson.1 at research.gla.ac.uk>>; Clas12_dileptons at jlab.org<mailto:Clas12_dileptons at jlab.org> <clas12_dileptons at jlab.org<mailto:clas12_dileptons at jlab.org>>
Subject: RE: Pass 2 Improvements

Hello Richard,

This looks very nice !
I have two questions :
Did you train the AI PID on Pass2 simulations too ? For overall consistency this should be done to have a one-to-one comparison
Also, in pass 2 the peaks are larger in both cases. While for neutron this can come from momentum correction, why is it also the case for proton ?


From: Richard Tyson (PGR) via Clas12_dileptons<mailto:clas12_dileptons at jlab.org>
Sent: Monday, July 3, 2023 8:37 AM
To: Clas12_dileptons at jlab.org<mailto:clas12_dileptons at jlab.org>
Subject: [Clas12_dileptons] [EXTERNAL] Pass 2 Improvements

Hi All,

As you may know pass 2 has been completed for the RG-B spring2019 dataset. Unfortunately, we had some power outages due to flooding in our offices in Glasgow so I was only able to transfer over roughly 60% of spring 2019. On these 60% of spring2019 we see an improvement of:

  *   ~80% for J/psi produced on the proton ( ep_bound -> (e') e+ e- p ).
  *   ~50% for J/psi produced on the neutron ( en_bound -> (e') e+ e- n ).

I've attached some slides related showing the pass1/pass2 comparison. I'm going on holidays tomorrow so I won't be able to attend the next couple of meetings but please let me know by email if you have any questions. I think Silvia is intending to give an update at the collaboration meeting about pass 2 improvements in RG-B and I was also going to send her these slides.


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Dr. Bryan McKinnon

Nuclear and Hadron Physics Research
School of Physics and Astronomy
University of Glasgow
G12 8QQ
Scotland UK

Tel: (+44/0) 141-330-7226

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