[G14_run] [EXTERNAL] Re: g14 meeting tomorrow at 9:00 am JLab time

[Haiyun Lu]

Hi Tsuneo,

Sorry for the late reply. I believe you are asking why the 2000 MeV
coherent-edge data is at the same distance away from the coherent edge as
1800 MeV data, although they are from different W ranges.
I don't have the complete answer but my understanding is that it is from
some intensional selections and other accidental factors.

The same range means that the farest points for these two are the same. I
believe this is because of the same requirement of beam polarization, i.e.
the beam polarization needs to be greater than 10%. This 10% is applied on
different coherent-edge runs.
If the correlation of beam polarization with the distance of beam energy to
the coherent edge is the same/similar, we would expect the largest distance
is the same or similar for different coherent-edge runs. In this case, it's
around 0.45.

The correlation between the W and beam energy is the same, which is the
concentrated slope. Since it is mastered by the kinematics, it is expected
to be the same.

The last factor is accidental and not intentional. The 1800 MeV data covers
from 1.84 to 1.9 about 60 MeV, while 2000 MeV data covers from 1.93 to 1.98
about 50 MeV. They are very close and therefore show the same/similar lower
limit of the distance of energy to the coherent edge.

I hope this can explain it.

Regards,
Haiyun


On Thu, Jul 10, 2025 at 3:34 PM Tsuneo Kageya <kageya at jlab.org> wrote:

> Hi Haiyun,
>
>  I have a question about your yesterday's presentation.
>
>  How did you get the data from 2000 MeV with the same cohe-edgde - Eg and W
> as 1800 MeV data ?
>  I am still confused.    From the second page, 2000 MeV data seem to have
> similar cohe-dedge - Eg, but higher W range than 1800 MeV data ?
>
>  Thank you.
>
>         Regards, Tsuneo Kageya.
> ------------------------------
> *From:* Haiyun Lu <haiyun.lu at gmail.com>
> *Sent:* Wednesday, July 9, 2025 10:21 AM
> *To:* Annalisa D'Angelo <annalisa.dangelo at roma2.infn.it>
> *Cc:* igor at gwu.edu <igor at gwu.edu>; Tsuneo Kageya <kageya at jlab.org>; g14
> run <g14_run at jlab.org>
> *Subject:* [EXTERNAL] Re: g14 meeting tomorrow at 9:00 am JLab time
>
> The presentation is attached.
>
> On Tue, Jul 8, 2025 at 1:09 PM Annalisa D'Angelo <
> annalisa.dangelo at roma2.infn.it> wrote:
>
> Dear All,
>
> to continue the discussion on the Analysis note status, let's meet for a
> g14 meeting  tomorrow  at 9:00 am JLab time.
>
>
> The link to the Zoom meeting is the following:
>
>
> https://urldefense.proofpoint.com/v2/url?u=https-3A__jlab-2Dorg.zoomgov.com_j_1608547947-3Fpwd-3DM1ZRc3k1dTlWek1Tb1o3V25uWlN1Zz09&d=DwIFaQ&c=CJqEzB1piLOyyvZjb8YUQw&r=5LSWsFN5KweowPCsdwCuT6TNyYmHKJ3RcKK8qa-oO-g&m=BBJuLer3iJ8kzMMowb3_95noel1_rxaQxXmfH_AWKvNgWRvYx9HtwkFFSnsu6vfD&s=vnZM9be3Ssybk6SHlErxTQ3-zgsL2hS-vesWbYM-Ksw&e= 
> <https://urldefense.proofpoint.com/v2/url?u=https-3A__jlab-2Dorg.zoomgov.com_j_1608547947-3Fpwd-3DM1ZRc3k1dTlWek1Tb1o3V25uWlN1Zz09&d=DwMFaQ&c=CJqEzB1piLOyyvZjb8YUQw&r=5LSWsFN5KweowPCsdwCuT6TNyYmHKJ3RcKK8qa-oO-g&m=a5rjQAEeKmo8bQtcVy3QdyKUoET0we9Jt90VgYZE6f5cVzmGbAKur5SnZuc9MtqW&s=qL3Z8lhB8Nm9KfOxpgaaYb7k-RjuLS1_ioAftn0b57w&e=>
>
> meeting id is
> 160 854 7947
>
> if required passcode is
>
> *396000.*
> All the best
> Annalisa
>
> --
> ================================================
> Prof. Annalisa D'Angelo
> Dip. Fisica, Universita' di Roma "Tor Vergata"
> Istituto Nazionale di Fisica Nucleare
> Sezione di Roma Tor Vergata, Rome Italyemail:annalisa.dangelo at roma2.infn.it
> Jefferson Laboratory, Newport News, VA USA
> Email: annalisa at jlab.org
> Tel: + 39 06 72594562
>
>
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