[Clas12_rgh] [EXTERNAL] RGH Jeopardy document

Sun Apr 7 08:22:12 EDT 2024

Silvia,

Pierre has all the numbers for the integrated charge for RG-A in his J/psi release note that Maxime sent around two days ago. See page 5, the total integrated change for RG-A f18 inbending is 36 mC.

Stepan

On Apr 7, 2024, at 5:34 AM, Silvia Niccolai via Clas12_rgh <clas12_rgh at jlab.org<mailto:clas12_rgh at jlab.org>> wrote:

Hi Anselm,
in our DVCS count-rate estimate we are taking RGA Fall18 data for pDVCS
and rescaling them by a RGH/RGA acceptance ratio (from gemc simulations of
the two run periods), times a ratio of the luminosities and beam times of
the two RGs. For RGH we have used 5*10^33 lumi and 100 days of beam time.
For RGA we have been having a hard time getting feedback from various RGA
members on how many PAC days Fall18 corresponds to. We were finally given
the integrated charge. Assuming a luminosity of 0.8*10^35 for RGA, we
deduced roughly 10 days of beam time for the inbending dataset.
So the lumi factor RGH/RGA comes out to be 100/10*(5*10^33/0.8*10^35)=0.6.
Then you need to fold in the acceptance ratio, which depends on your
reaction.
Best regards,
Silvia

Dear All,

Matthew worked on SIDIS simulations that he will show Monday.
He will look at single and di-hadron asymmetries.
I talked to Andreas Metz from Temple who I work with on EIC impact studies
and he told me that they can try to come up with impact studies using RGH
pseudodata in the next two weeks (but no promises).

I also promised Marco to work on the SIDIS part in the next few days.

One question though about the anticipated statistics: I see the dilution
and polarization factors for the target in the document but it is not
clear to me how the anticipated integrated luminosity compares to a given
RGA period.

From the conservative luminosity estimate, I would get a factor 20 less
but how much running time is requested? Is 1/20th of the RGA statistics
reasonable?

What are the DVCS projections using?

Thanks,

Anselm

________________________________________
From: Clas12_rgh <clas12_rgh-bounces at jlab.org<mailto:clas12_rgh-bounces at jlab.org>> on behalf of Silvia
Niccolai via Clas12_rgh <clas12_rgh at jlab.org<mailto:clas12_rgh at jlab.org>>
Sent: Saturday, April 6, 2024 12:40 PM
To: Volker Burkert
Cc: clas12_rgh at jlab.org<mailto:clas12_rgh at jlab.org>
Subject: Re: [Clas12_rgh] [EXTERNAL] RGH Jeopardy document

Hello all,
Sebastian, Adam and I are working on DVCS projections, Iâ?Tll include them
tomorrow and update the text accordingly.
Best regards,
Silvia
Sent from my iPhone

On 6 Apr 2024, at 18:25, Volker Burkert via Clas12_rgh
<clas12_rgh at jlab.org<mailto:clas12_rgh at jlab.org>> wrote:

ï»¿
Thank you Chris!
Much improved on the polarized target.
Volker

________________________________
From: Christopher Keith <ckeith at jlab.org<mailto:ckeith at jlab.org>>
Sent: Saturday, April 6, 2024 9:10 AM
To: clas12_rgh at jlab.org<mailto:clas12_rgh at jlab.org> <clas12_rgh at jlab.org<mailto:clas12_rgh at jlab.org>>; mcontalb at fe.infn.it<mailto:mcontalb at fe.infn.it>
<mcontalb at fe.infn.it<mailto:mcontalb at fe.infn.it>>; Volker Burkert <burkert at jlab.org<mailto:burkert at jlab.org>>
Subject: Re: [Clas12_rgh] [EXTERNAL] RGH Jeopardy document

Hi Volker,
Take a look at the jeopardy document again. I did some editing yesterday
afternoon. There is a new, longer Target section, and references to the
bulk superconducting magnet and Hall C magnet have been commented out.

Chris
________________________________
From: Clas12_rgh <clas12_rgh-bounces at jlab.org<mailto:clas12_rgh-bounces at jlab.org>> on behalf of Volker Burkert
via Clas12_rgh <clas12_rgh at jlab.org<mailto:clas12_rgh at jlab.org>>
Sent: Friday, April 5, 2024 10:27 PM
To: clas12_rgh at jlab.org<mailto:clas12_rgh at jlab.org> <clas12_rgh at jlab.org<mailto:clas12_rgh at jlab.org>>; mcontalb at fe.infn.it<mailto:mcontalb at fe.infn.it>
<mcontalb at fe.infn.it<mailto:mcontalb at fe.infn.it>>
Subject: Re: [Clas12_rgh] [EXTERNAL] RGH Jeopardy document

Dear Marco,

I have read the draft and have a few comments that I list here.

1.
In section 2 Physics highlights under GPD E it says that "Its measurement
in ... DVCS requires a transversely polarized proton target as a
complementary approach to the beam spin asymmetry of an unpolarized
neutron target" I think this formulation is misleading as it could be
interpreted that a measurement on a transverse polarized proton target is
equivalent to a measurement of the beam spin asymmetry on an unpolarized
neutron target. This would be incorrect as the measurement on a neutron
target measures E^n, while the transverse proton target measures E^p.
These are obviously different quantities.

2.
Section 3.3 - Bulk Magnet. I am not sure if we should include a fairly
long section into the discussion, as this was only relevant for the HDIce
option.

3.
I have some concern on including anything on the Hall C polarized target
in the presentation. It could cause a discussion that we not necessarily
want as it just distracts from focusing on our solution to the HDIce
problem. If for some reason anyone would bring it up we should be prepared
to address it.

4.
Minor typos: Section 4.1. The luminosity 10x10^35 = 10^36 should be just
10^35. The "1 mrad in azimuthal angle" should be " 1 mrad in polar
angle".

5.
Section 5 Physics Observables. I suggest to replace 12 GeV with 10.6 GeV
or 11 GeV.

Best regards,
Volker

________________________________
From: Clas12_rgh <clas12_rgh-bounces at jlab.org<mailto:clas12_rgh-bounces at jlab.org>> on behalf of Marco
Contalbrigo via Clas12_rgh <clas12_rgh at jlab.org<mailto:clas12_rgh at jlab.org>>
Sent: Monday, April 1, 2024 7:15 AM
To: clas12_rgh at jlab.org<mailto:clas12_rgh at jlab.org> <clas12_rgh at jlab.org<mailto:clas12_rgh at jlab.org>>
Subject: [Clas12_rgh] [EXTERNAL] RGH Jeopardy document

Dear all,
a draft of the RGH jeopardy document has been opened
on overleaf. You can access it via

https://urldefense.proofpoint.com/v2/url?u=https-3A__www.overleaf.com_read_hsmmsyrcbrbm-23a78ab6&d=DwIBAg&c=CJqEzB1piLOyyvZjb8YUQw&r=QWa4FYrGl2z7tyOHBIYcegdYaNKy_NApZOlUL0J3DAI&m=U0h7CvSrGo84Dcp2l9ksvTIjRAz93gEI1DoJYrNskJW6O3n-D4BvXACmk7_lCVox&s=oHCIemsXaYK6DXaH6ufh-8_RnQqK55wLu2t54a3xanU&e=

Comments and suggestions are welcome. If you like to
have writing permission, just let me know.

Thanks, Marco.

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