[Clas12_dileptons] Pass 2 Improvements

Pierre Chatagnon pierrec at jlab.org
Mon Jul 3 08:48:03 EDT 2023

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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