[Clas12_dileptons] Slides for next week presentation at the SoLID workshop in ANL

[Valery Kubarovsky]

Hi Pierre,
very nice talk.
I have several remarks.

Page 3. ... must be understood or ruled out

I think that after the latest paper by Craig Roberts (2405.17675) and his report at the User Meeting on Wednesday
we have to be careful about making  strong statement regarding access to the GFF from the J/psi near threshold photoproduction.
He wrote: It is premature to link existing photoproduction data with in-proton gluon distributions ....
We have access to GFF only within the framework of GPD models, which may  or may not be correct.

Page 8.
HTCC Nphe distribution look not very impressive. How did you get it?

Page 12
Are you using Gaussian function to fit the J/psi signal? I think that we have to use convolution off the radiative tail with the experimental resolution to take into account radiative tail.

Page 13
People will read this sentence " High Q^2 background"  like we have background from the electron scattering events with high Q^2.

Page 35, 38
 Radiative effects.
Soft photon corrections based on the BH process give a factor of 2 higher corrections than the correct one based on the J/psi ptotoproduction.
And we need not only soft photon correction but the hard photon corrections to fully account for the radiative effects.
Both these corrections are available now.

Good luck!,
Valery


________________________________
From: Clas12_dileptons <clas12_dileptons-bounces at jlab.org> on behalf of Pierre Chatagnon via Clas12_dileptons <clas12_dileptons at jlab.org>
Sent: Wednesday, June 12, 2024 16:24
To: clas12_dileptons at jlab.org <clas12_dileptons at jlab.org>
Subject: [Clas12_dileptons] Slides for next week presentation at the SoLID workshop in ANL

Hello all,

I will be presenting the CLAS12 Jpsi effort next week at the SoLID workshop in ANL. Everything included is in my release note. I also include one slide on Richard's work on RGB also in his note. The presentation is 30 minutes.

I have just remade some of the plot aesthetically and added some on the GFF interpretation.

Please send me your comments before next Monday, the day of the talk.

Best
Pierre
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