[Clas12_dileptons] Pass 2 Improvements

Pierre Chatagnon pierrec at jlab.org
Wed Jul 5 12:21:09 EDT 2023

Hello all,

Similarly to what Richard shown, I ran my code on the currently available pass2 data for RGA (52 runs of Spring 2019 out of 121). Some of the figures I have produced are in the slides attached that I am planning to sent to Timothy to include in his presentation at the collaboration next week.

There is a great improvement in the number of Jpsi, close to 86% (a very similar number to what Richard mentioned). The width seems better too (though it needs full statistics to really give a good conclusion on this point).

Please let me know if you have any questions/comments. Otherwise I plan to send these plots to Timothy by tomorrow


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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