[Clas12_dileptons] Slides for the collaboration meeting

[Valery Kubarovsky]

Hi Pierre,
The presentation looks very impressive!
Remarks:

Slide   7.  Add rad. correction units (%).

Slide 19. Misprint "th flattening"


Slide 16, Q2 dependence.

In November you presented dependence of the cross section as a function of Q2 cut, see attached plot.

The dependence on this cut is very strong. Now you are using more soft Q2 cut and cross section goes up and is now compatible with other Jlab results.

However slide 16 shows Q2 cut dependence only in one high energy bin actually.

Am I missing something?



Slide 20.

Dmitri Kharzeev in his paper wrote that the theoretical uncertainties in the determination of the proton radius are increasing with the beam energy. He stressed that we need to measure t-distribution as close to the threshold as possible. You can even see some dependence of the radius as a function of the beam energy that you are  presenting. By this reason  the most valuable data are coming from the low beam energy.

You can mention it at your slide.

Unfortunately the statistics is not great close to threshold due to the total cross section drop.


The color scheme is not good in my view. Green and blue are almost the same.


Good luck with your presentation,

Valery


________________________________
From: Clas12_dileptons <clas12_dileptons-bounces at jlab.org> on behalf of Pierre Chatagnon via Clas12_dileptons <clas12_dileptons at jlab.org>
Sent: Friday, March 8, 2024 15:30
To: clas12_dileptons at jlab.org <clas12_dileptons at jlab.org>
Subject: [Clas12_dileptons] Slides for the collaboration meeting

Hello all,

I will present the JPsi analysis at the collaboration meeting next week. I attached the slides that I intend to show to this email.
They are essentially what I showed at the DPWG meeting a month ago with new additions:
      on slides 9 I added a plot of the phase space that we cover
      on slides 20 I added a plot with a comparison of the mass radius extracted by Hall C, GlueX and CLAS12
Please let me know your comments/corrections

Best
Pierre
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