[Rgc] Fwd: [EXTERNAL] additional info on RGC

[silvia at jlab.org]

Hi Sebastian,
I think that in the set of slides I gave you for the jeopardy there was
also the extraction of the CFFs and the flavor separation of the Im(H) and
Im(E) CFFs, maybe this can go in the right direction to satisfy the
reader. For the proton DVCS case maybe we could show 6-GeV data, and the
impact that they made on CFF extractions with local fits (what we had in
our 2nd paper from eg1-dvcs) - basically access to Im(Htilde) and improved
precision for Im(H), as well as increased sensitivity to Re(H). I can look
for the plots, if you wish.
There are a couple of caveats that I must add to this: analyzing RGB data
I noticed that the projections I made for the nDVCS proposals were quite
optimistic as far as the yields were concerned. As in my own jeopardy talk
I will present our new projections, made with data, it could happen that
you may have some comments about this. You can say that the grid of bins
will be adapted based upon the actual statistics (someting like 2 t-bins
instead of 4, etcetera). The sensitivity to GPDs doesn't change, just the
binning and statistical precision. I cannot unfortunately produce
data-driven projections for RGC because the RGB projections I have are
with FTon.
Best regards,
Silvia



> Dear all,
>
> I JUST received this feedback from a PAC member (presumably our reader?)
> for the RG-C jeopardy review. It should be obvious that this kind of
> information cannot be produced in time with 48 hours to go, but I am
> asking all of you if you have any studies that you can quote/summarize in
> 1 slide for your favorite channel to address her question.
>
> I can probably dig up the JAM study we did way back when we looked at
> increasing the time approved for deuterium for the inclusive channels. So
> I’ll cook something up about that. I can also look at the W results, but
> I am pretty sure that they will have minimal overlap with the region x =
> 0.1…0.8 where our data will have the highest impact. For DVCS, it might
> be good if we had a comparison how the polarized target data improve on
> what we can extract with unpolarized target only.
>
> Chris, maybe it would be helpful to have a 1-slide schedule for the
> remaining target work. I believe we should stick with “dress rehearsal
> Fall 2021” as the present accelerator schedule shows other experiments
> running until October next year anyway. Then we can say that we will be
> ready to install ANYTIME right after that.
>
> I believe the issue with “SR” (she probably means synchrotron
> radiation) is a red herring as the target field is along the beam
> direction and the beam, even if rastered, will be parallel to the z-axes.
>
> Anyway, I’m looking for updating my slides this afternoon (mostly with
> backup slides to address these questions) so ANY feedback you can give me
> until, say, 2 p.m. today would be MUCH appreciated.
>
> - Sebastian
>
> Begin forwarded message:
>
> From: Aschenauer Elke-Caroline <elke at bnl.gov<mailto:elke at bnl.gov>>
> Subject: [EXTERNAL] additional info on RGC
> Date: September 22, 2020 at 10:30:37 PM EDT
> To: kuhn at jlab.org<mailto:kuhn at jlab.org>, Diehl Markus
> <markus.diehl at desy.de<mailto:markus.diehl at desy.de>>, "Paschke, Kent Dieter
> (kdp2c)" <paschke at virginia.edu<mailto:paschke at virginia.edu>>
> Cc: Aschenauer Elke-Caroline <elke at bnl.gov<mailto:elke at bnl.gov>>
>
> Dear Sebastian,
>
> I hope all is well with you and your loved ones in this crazy times.
> I’m looking for some additional information for the RGC measurements.
> Can you provide me with impact studies on the different measurements to
> constrain the helicity quark distributions,
> TMDs and GPDs. I’m looking for studies like done for the EIC were
> pseudo-data of the experiment are integrated in a PDF fit/extraction.
> For all of this impact studies it would be nice to have them based on
> modern PDFs, especially for the helicity PDFs the RHIC W data should be
> included.
>
> In addition I would like to see a schedule for the target construction, to
> understand if really everything is include the experiment could run in
> 2021.
> And last but not least, you discuss in detail the moeller background, but
> I’m surprised there is no discussion about SR
> with a 5 T magnet and a beam, which is rastered, can you give me please
> some details on this.
>
> Thanks for any information you can provide
> elke
>
>
>
> Note: Please do not feel obligated to respond to this message outside of
> your work hours.
>
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