[PRad] [EXTERNAL] Re: Presentation for the CLAS Collaboration Meeting

[gasparan at jlab.org]

 Dear Patrick and Jingyi,

 I would like to add few points on your comments/answers:
 1) the Rsenblith plot is not "central" for our physics since we are
    not using in our FF extraction process. It can be easily removed
    from the presentation, you will only gain from that.
 2) The "Tagger" issue was discussed during the PRad-II proposal several
    times. We better to have it partially operational for the GEM/HyCal
    calibration and HyCal equalizing process. For this we wanted to have
    the ~30% of Tagger focal plane detectors operational. In bad scenario
    we may also use tagger with a few T-counter open and use the pi0
    calibration. However, for the pi0 calibration we will need a solid
    target to insert it in the target area. This question needs further
    development.

 Thanks,
 Ashot


> Dear Jingyi
>
> I still believe that the plot is not very attractive. First, it is based
> on a very old data set from the 1990s. Then, it is not very intuitive to
> me why the reduced cross section normalized to the squared dipole form
> factor should not be within a few percent from unity, at least at low
> epsilon. At epsilon = 0, the reduced cross section equals G_M^2 and the
> value on the y-axis equals (G_M/G_D)^2, right? I believe one can easily
> produce a much more convincing plot from today's existing world data set.
> The A1 data set, Bernauer et al., has Rosenbluth separations for 77
> different Q2 values.
>
> I was referring to your label saying "Tagger" on p. 17, it gives the
> impression that it is used in the measurement.
>
> Have a nice weekend,
> Patrick
>
> ________________________________________
> From: Jingyi Zhou <jingyi.zhou at duke.edu>
> Sent: Friday, July 7, 2023 15:17
> To: Patrick Achenbach; prad at jlab.org
> Subject: Re: [PRad] [EXTERNAL] Re: Presentation for the CLAS Collaboration
>      Meeting
>
> Hi Patrick,
>
> Thanks for your questions.
>
> The plot on page 4 is from Fig.3 of this paper, I added the reference to
> the slides now.
> https://arxiv.org/pdf/hep-ph/0612014.pdf<https://urldefense.proofpoint.com/v2/url?u=https-3A__arxiv.org_pdf_hep-2Dph_0612014.pdf&d=DwMFAg&c=CJqEzB1piLOyyvZjb8YUQw&r=DexAQjBL_LBq3J1v5tq-2pUGL-q3U3lNFJACyX2xBKA&m=E_EYfRyweu3oKMK978wA9Tm_nYzjkM99u1ajkLgDfSn9CB9wOD1QEel7xDggrg2h&s=ejkZvtT8yGHmd3_8R2wNTNjWrDqn3Ic574InVqdmILw&e=>
> It is an example demonstrating the Rosenbluth separation technique. Data
> points are shown for the Q2 values of 2.5 (open triangles), 5.0 (open
> circles) and 7.0 (filled triangles) (GeV/c)^2 . The straight lines are
> linear fits to the corresponding data points.
>
> I am confused about your question on p.17. I don't have any references on
> p.17.
>
> I also changed that to "proposal" on p.23.
>
> Best,
> Jingyi
> ________________________________
> From: Patrick Achenbach <patricka at jlab.org>
> Sent: Friday, July 7, 2023 2:40 PM
> To: prad at jlab.org <prad at jlab.org>; Jingyi Zhou <jingyi.zhou at duke.edu>
> Subject: Re: [PRad] [EXTERNAL] Re: Presentation for the CLAS Collaboration
> Meeting
>
> Dear Jingyi,
>
> thanks for the nice slides. I have a few comments:
>
> I don't fully understand your plot on page 4.
> - Which data set is plotted there? Is this from PRad? No reference is
> given.
> - Why are the values between 7 and 9? Is this in per mille? The
> differences of any cross section data form the standard dipole form are
> maximum of 2-3 %.
> - What is the Q2-value for the three different data sets?
>
> I also don't quite understand the references to the tagger on p. 17. The
> tagger is not operational. I have not seen a request to upgrade the tagger
> in the DRad proposal.
>
> On p. 23 I would call the DRad a "proposal", in line of what Ashot was
> discussing.
>
> Best,
> Patrick
>
> ________________________________________
> From: PRad <prad-bounces at jlab.org> on behalf of Jingyi Zhou via PRad
> <prad at jlab.org>
> Sent: Friday, July 7, 2023 14:06
> To: prad at jlab.org
> Subject: [PRad] [EXTERNAL] Re: Presentation for the CLAS Collaboration
> Meeting
>
> Dear all,
>
> Thank you very much for your comments! Attached please find the latest
> version of my presentation.
>
> Best,
> Jingyi
> ________________________________
> From: PRad <prad-bounces at jlab.org> on behalf of Jingyi Zhou via PRad
> <prad at jlab.org>
> Sent: Wednesday, July 5, 2023 6:42 PM
> To: prad at jlab.org <prad at jlab.org>
> Subject: [PRad] [EXTERNAL] Presentation for the CLAS Collaboration Meeting
>
> Dear all,
>
> Attached are my slides for the CLAS Collaboration Meeting. The talk will
> be on next Friday (July 14th) at 10:05 am. It will be 20mins presentation
> + 5mins Q&A. Please let me know if you have any suggestions.
>
> Thanks,
> Jingyi
>
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